Metadata-Version: 1.0
Name: zope.testing
Version: 3.9.7
Summary: Zope testing framework, including the testrunner script.
Home-page: http://pypi.python.org/pypi/zope.testing
Author: Zope Foundation and Contributors
Author-email: zope-dev@zope.org
License: ZPL 2.1
Description: ************
        zope.testing
        ************
        
        .. contents::
        
        This package provides a number of testing frameworks.  It includes a
        flexible test runner, and supports both doctest and unittest.
        
        cleanup.py
        Provides a mixin class for cleaning up after tests that
        make global changes.
        
        doctest.py
        Enhanced version of python's standard doctest.py.
        Better test count (one per block instead of one per docstring).
        See doctest.txt.
        
        (We need to merge this with the standard doctest module.)
        
        doctestunit.py
        Provides a pprint function that always sorts dictionary entries
        (pprint.pprint from the standard library doesn't sort very short ones,
        sometimes causing test failures when the internal order changes).
        
        formparser.py
        An HTML parser that extracts form information.
        
        This is intended to support functional tests that need to extract
        information from HTML forms returned by the publisher.
        
        See formparser.txt.
        
        loggingsupport.py
        Support for testing logging code
        
        If you want to test that your code generates proper log output, you
        can create and install a handler that collects output.
        
        loghandler.py
        Logging handler for tests that check logging output.
        
        module.py
        Lets a doctest pretend to be a Python module.
        
        See module.txt.
        
        renormalizing.py
        Regular expression pattern normalizing output checker.
        Useful for doctests.
        
        server.py
        Provides a simple HTTP server compatible with the zope.app.testing
        functional testing API.  Lets you interactively play with the system
        under test.  Helpful in debugging functional doctest failures.
        
        setupstack.py
        A simple framework for automating doctest set-up and tear-down.
        See setupstack.txt.
        
        testrunner
        The test runner package.  This is typically wrapped by a test.py script that
        sets up options to run a particular set of tests.
        
        
        Getting started
        ***************
        
        zope.testing uses buildout.  To start, run ``python bootstrap.py``.  It will
        create a number of directories and the ``bin/buildout`` script.  Next, run
        ``bin/buildout``.  It will create a test script for you.  Now, run ``bin/test``
        to run the zope.testing test suite.
        
        zope.testing Changelog
        **********************
        
        3.9.7 (2011-11-02)
        ==================
        
        - Work around sporadic timing-related issues in the subprocess buffering
        tests.  Thanks to Jonathan Ballet for the patch!
        
        
        3.9.6 (2011-02-21)
        ==================
        
        - LP #719369: An `Unexpected success`_ (concept intruduced in Python 2.7) is
        no longer handled as success but as failure. This is a workaround. The
        whole unexpected success concept might be implemented later.
        
        .. _`Unexpected success`: http://www.voidspace.org.uk/python/articles/unittest2.shtml#more-skipping
        
        - Updated tests to run on Python 2.7, too.
        
        
        3.9.5 (2010-05-19)
        ==================
        
        - LP #579019: When layers were run in parallel, their tearDown was not
        called. Additionally, the first layer which was run in the main
        thread did not have it's tearDown called either.
        
        - Deprecated zope.testing.testrunner and zope.testing.exceptions. They have
        been moved to a separate zope.testrunner module, and will be removed from
        zope.testing in 4.0.0, together with zope.testing.doctest.
        
        3.9.4 (2010-04-13)
        ==================
        
        - LP #560259: Fix subunit output formatter to handle layer setup
        errors.
        
        - LP #399394:  Added a ``--stop-on-error`` / ``--stop`` / ``-x`` option to
        the testrunner.
        
        - LP #498162:  Added a ``--pdb`` alias for the existing ``--post-mortem``
        / ``-D`` option to the testrunner.
        
        - LP #547023:  Added a ``--version`` option to the testrunner.
        
        - Added tests for LP #144569 and #69988.
        
        https://bugs.launchpad.net/bugs/69988
        
        https://bugs.launchpad.net/zope3/+bug/144569
        
        
        3.9.3 (2010-03-26)
        ==================
        
        - zope.testing.renormalizer no longer imports zope.testing.doctest, which
        caused deprecation warnings.
        
        - Fix testrunner-layers-ntd.txt to suppress output to sys.stderr.
        
        - Suppress zope.testing.doctest deprecation warning when running
        zope.testing's own test suite.
        
        
        3.9.2 (2010-03-15)
        ==================
        
        - Fixed broken ``from zope.testing.doctest import *``
        
        3.9.1 (2010-03-15)
        ==================
        
        - No changes; reuploaded to fix broken 3.9.0 release on PyPI.
        
        3.9.0 (2010-03-12)
        ==================
        
        - Modified the testrunner to use the standard Python doctest module instead of
        the deprecated zope.testing.doctest.
        
        - Fix testrunner-leaks.txt to use the run_internal helper, so that
        sys.exit() isn't triggered during the test run.
        
        - Added support for conditionally using a subunit-based output
        formatter upon request if subunit and testtools are available. Patch
        contributed by Jonathan Lange.
        
        
        3.8.6 (2009-12-23)
        ==================
        
        - Added MANIFEST.in and reuploaded to fix broken 3.8.5 release on PyPI.
        
        
        3.8.5 (2009-12-23)
        ==================
        
        - Added DocFileSuite, DocTestSuite, debug_src and debug back BBB imports
        back into zope.testing.doctestunit; apparently many packages still import
        them from there!
        
        - Made zope.testing.doctest and zope.testing.doctestunit emit deprecation
        warnings: use the stdlib doctest instead.
        
        
        3.8.4 (2009-12-18)
        ==================
        
        - Fixed missing imports and undefined variables reported by pyflakes,
        adding tests to exercise the blind spots.
        
        - Cleaned up unused imports reported by pyflakes.
        
        - Added two new options to generate randomly ordered list of tests and to
        select a specific order of tests.
        
        - RENormalizing checkers can be combined via ``+`` now:
        ``checker1 + checker2`` creates a checker with the transformations of both
        checkers.
        
        - Test fixes for Python 2.7.
        
        3.8.3 (2009-09-21)
        ==================
        
        - Avoid a split() call or we get test failures when running from a directory
        with spaces in it.
        
        - Fix testrunner behavior on Windows for -j2 (or greater) combined with -v
        (or greater).
        
        3.8.2 (2009-09-15)
        ==================
        
        - Removing hotshot profiler when using Python 2.6. That makes zope.testing
        compatible with Python 2.6
        
        
        3.8.1 (2009-08-12)
        ==================
        
        - Avoid hardcoding sys.argv[0] as script;
        allow, for instance, Zope 2's `bin/instance test` (LP#407916).
        
        - Produce a clear error message when a subprocess doesn't follow the
        zope.testing.testrunner protocol (LP#407916).
        
        - Do not unnecessarily squelch verbose output in a subprocess when there are
        not multiple subprocesses.
        
        - Do not unnecessarily batch subprocess output, which can stymie automated and
        human processes for identifying hung tests.
        
        - Include incremental output when there are multiple subprocesses and a
        verbosity of -vv or greater is requested.  This again is not batched,
        supporting automated processes and humans looking for hung tests.
        
        
        3.8.0 (2009-07-24)
        ==================
        
        - Testrunner automatically picks up descendants of unittest.TestCase in test
        modules, so you don't have to provide a test_suite() anymore.
        
        
        3.7.7 (2009-07-15)
        ==================
        
        - Clean up support for displaying tracebacks with supplements by turning it
        into an always-enabled feature and making the dependency on zope.exceptions
        explicit.
        
        - Fix #251759: Test runner descended into directories that aren't Python
        packages.
        
        - Code cleanups.
        
        
        3.7.6 (2009-07-02)
        ==================
        
        - Add zope-testrunner console_scripts entry point. This exposes a
        zope-testrunner binary with default installs allowing the testrunner to be
        run from the command line.
        
        3.7.5 (2009-06-08)
        ==================
        
        - Fix bug when running subprocesses on Windows.
        
        - The option REPORT_ONLY_FIRST_FAILURE (command line option "-1") is now
        respected even when a doctest declares its own REPORTING_FLAGS, such as
        REPORT_NDIFF.
        
        - Fixed bug that broke readline with pdb when using doctest
        (see http://bugs.python.org/issue5727).
        
        - Made tests pass on Windows and Linux at the same time.
        
        
        3.7.4 (2009-05-01)
        ==================
        
        - Filenames of doctest examples now contain the line number and not
        only the example number. So a stack trace in pdb tells the exact
        line number of the current example. This fixes
        https://bugs.launchpad.net/bugs/339813
        
        - Colorization of doctest output correctly handles blank lines.
        
        
        3.7.3 (2009-04-22)
        ==================
        
        - Better deal with rogue threads by always exiting with status so even
        spinning daemon threads won't block the runner from exiting. This deprecated
        the ``--with-exit-status`` option.
        
        
        3.7.2 (2009-04-13)
        ==================
        
        - fix test failure on Python 2.4 because of slight difference in the way
        coverage is reported (__init__ files with only a single comment line are now
        not reported)
        - fixed bug that caused the test runner to hang when running subprocesses (as a
        result Python 2.3 is no longer supported).
        - there is apparently a bug in Python 2.6 (related to
        http://bugs.python.org/issue1303673) that causes the profile tests to fail.
        - added explanitory notes to buildout.cfg about how to run the tests with
        multiple versions of Python
        
        
        3.7.1 (2008-10-17)
        ==================
        
        - The setupstack temporary-directory support now properly handles
        read-only files by making them writable before removing them.
        
        
        3.7.0 (2008-09-22)
        ==================
        
        - Added an alterate setuptools / distutils commands for running all tests
        using our testrunner.  See 'zope.testing.testrunner.eggsupport:ftest'.
        
        - Added a setuptools-compatible test loader which skips tests with layers:
        the testrunner used by 'setup.py test' doesn't know about them, and those
        tests then fail.  See 'zope.testing.testrunner.eggsupport:SkipLayers'.
        
        - Added support for Jython, when a garbage collector call is sent.
        
        - Added support to bootstrap on Jython.
        
        - Fixed NameError in StartUpFailure.
        
        - Open doctest files in universal mode, so that packages released in Windoes
        can be tested in Linux, for example.
        
        
        3.6.0 (2008/07/10)
        ==================
        
        - Added -j option to parallel tests run in subprocesses.
        
        - RENormalizer accepts plain Python callables.
        
        - Added --slow-test option.
        
        - Added --no-progress and --auto-progress options.
        
        - Complete refactoring of the test runner into multiple code files and a more
        modular (pipeline-like) architecture.
        
        - Unified unit tests with the layer support by introducing a real unit test
        layer.
        
        - Added a doctest for ``zope.testing.module``. There were several bugs
        that were fixed:
        
        * ``README.txt`` was a really bad default argument for the module
        name, as it is not a proper dotted name. The code would
        immediately fail as it would look for the ``txt`` module in the
        ``README`` package. The default is now ``__main__``.
        
        * The tearDown function did not clean up the ``__name__`` entry in the
        global dictionary.
        
        - Fix a bug that caused a SubprocessError to be generated if a subprocess
        sent any output to stderr.
        
        - Fix a bug that caused the unit tests to be skipped if run in a subprocess.
        
        
        3.5.1 (2007/08/14)
        ==================
        
        Bugs Fixed:
        -----------
        
        - Post-mortem debugging wasn't invoked for layer-setup failures.
        
        3.5.0 (2007/07/19)
        ==================
        
        New Features
        ------------
        
        - The test runner now works on Python 2.5.
        
        - Added support for cProfile.
        
        - Added output colorizing (-c option).
        
        - Added --hide-secondary-failures and --show-secondary-failures options
        (https://bugs.launchpad.net/zope3/+bug/115454).
        
        Bugs Fixed:
        -----------
        
        - Fix some problems with Unicode in doctests.
        
        - Fix "Error reading from subprocess" errors on Unix-like systems.
        
        3.4 (2007/03/29)
        ================
        
        New Features
        ------------
        
        - Added exit-with-status support (supports use with buildbot and
        zc.recipe.testing)
        
        - Added a small framework for automating set up and tear down of
        doctest tests. See setupstack.txt.
        
        Bugs Fixed:
        -----------
        
        - Fix testrunner-wo-source.txt and testrunner-errors.txt to run with a
        read-only source tree.
        
        3.0 (2006/09/20)
        ================
        
        - Updated the doctest copy with text-file encoding support.
        
        - Added logging-level support to loggingsuppport module.
        
        - At verbosity-level 1, dots are not output continuously, without any
        line breaks.
        
        - Improved output when the inability to tear down a layer causes tests
        to be run in a subprocess.
        
        - Made zope.exception required only if the zope_tracebacks extra is
        requested.
        
        2.x.y (???)
        ===========
        
        - Fix the test coverage. If a module, for example `interfaces`, was in an
        ignored directory/package, then if a module of the same name existed in a
        covered directory/package, then it was also ignored there, because the
        ignore cache stored the result by module name and not the filename of the
        module.
        
        2.0 (2006/01/05)
        ================
        
        - Corresponds to the version of the zope.testing package shipped as part of
        the Zope 3.2.0 release.
        
        Detailed Documentation
        **********************
        
        Test Runner
        ===========
        
        The testrunner module is used to run automated tests defined using the
        unittest framework.  Its primary feature is that it *finds* tests by
        searching directory trees.  It doesn't require the manual
        concatenation of specific test suites.  It is highly customizable and
        should be usable with any project.  In addition to finding and running
        tests, it provides the following additional features:
        
        - Test filtering using specifications of:
        
        o test packages within a larger tree
        
        o regular expression patterns for test modules
        
        o regular expression patterns for individual tests
        
        - Organization of tests into levels and layers
        
        Sometimes, tests take so long to run that you don't want to run them
        on every run of the test runner.  Tests can be defined at different
        levels.  The test runner can be configured to only run tests at a
        specific level or below by default.  Command-line options can be
        used to specify a minimum level to use for a specific run, or to run
        all tests.  Individual tests or test suites can specify their level
        via a 'level' attribute. where levels are integers increasing from 1.
        
        Most tests are unit tests.  They don't depend on other facilities, or
        set up whatever dependencies they have.  For larger applications,
        it's useful to specify common facilities that a large number of
        tests share.  Making each test set up and and tear down these
        facilities is both ineffecient and inconvenient.  For this reason,
        we've introduced the concept of layers, based on the idea of layered
        application architectures.  Software build for a layer should be
        able to depend on the facilities of lower layers already being set
        up.  For example, Zope defines a component architecture.  Much Zope
        software depends on that architecture.  We should be able to treat
        the component architecture as a layer that we set up once and reuse.
        Similarly, Zope application software should be able to depend on the
        Zope application server without having to set it up in each test.
        
        The test runner introduces test layers, which are objects that can
        set up environments for tests within the layers to use.  A layer is
        set up before running the tests in it.  Individual tests or test
        suites can define a layer by defining a `layer` attribute, which is
        a test layer.
        
        - Reporting
        
        - progress meter
        
        - summaries of tests run
        
        - Analysis of test execution
        
        - post-mortem debugging of test failures
        
        - memory leaks
        
        - code coverage
        
        - source analysis using pychecker
        
        - memory errors
        
        - execution times
        
        - profiling
        
        Simple Usage
        ============
        
        The test runner consists of an importable module.  The test runner is
        used by providing scripts that import and invoke the `run` method from
        the module.  The `testrunner` module is controlled via command-line
        options.  Test scripts supply base and default options by supplying a
        list of default command-line options that are processed before the
        user-supplied command-line options are provided.
        
        Typically, a test script does 2 things:
        
        - Adds the directory containing the zope package to the Python
        path.
        
        - Calls the test runner with default arguments and arguments supplied
        to the script.
        
        Normally, it just passes default/setup arguments.  The test runner
        uses `sys.argv` to get the user's input.
        
        This testrunner_ex subdirectory contains a number of sample packages
        with tests.  Let's run the tests found here. First though, we'll set
        up our default options:
        
        >>> import os.path
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        The default options are used by a script to customize the test runner
        for a particular application.  In this case, we use two options:
        
        path
        Set the path where the test runner should look for tests.  This path
        is also added to the Python path.
        
        tests-pattern
        Tell the test runner how to recognize modules or packages containing
        tests.
        
        Now, if we run the tests, without any other options:
        
        >>> from zope.testing import testrunner
        >>> import sys
        >>> sys.argv = ['test']
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer1 tests:
        Set up samplelayers.Layer1 in N.NNN seconds.
        Ran 9 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer11 tests:
        Set up samplelayers.Layer11 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer111 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer112 tests:
        Tear down samplelayers.Layer111 in N.NNN seconds.
        Set up samplelayers.Layer112 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer12 tests:
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer121 tests:
        Set up samplelayers.Layer121 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer122 tests:
        Tear down samplelayers.Layer121 in N.NNN seconds.
        Set up samplelayers.Layer122 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down samplelayers.Layer122 in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 405 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        we see the normal testrunner output, which summarizes the tests run for
        each layer.  For each layer, we see what layers had to be torn down or
        set up to run the layer and we see the number of tests run, with
        results.
        
        The test runner returns a boolean indicating whether there were
        errors.  In this example, there were no errors, so it returned False.
        
        (Of course, the times shown in these examples are just examples.
        Times will vary depending on system speed.)
        
        Layers
        ======
        
        A Layer is an object providing setup and teardown methods used to setup
        and teardown the environment provided by the layer. It may also provide
        setup and teardown methods used to reset the environment provided by the
        layer between each test.
        
        Layers are generally implemented as classes using class methods.
        
        >>> class BaseLayer:
        ...     def setUp(cls):
        ...         log('BaseLayer.setUp')
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('BaseLayer.tearDown')
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('BaseLayer.testSetUp')
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('BaseLayer.testTearDown')
        ...     testTearDown = classmethod(testTearDown)
        ...
        
        Layers can extend other layers. Note that they do not explicitly
        invoke the setup and teardown methods of other layers - the test runner
        does this for us in order to minimize the number of invocations.
        
        >>> class TopLayer(BaseLayer):
        ...     def setUp(cls):
        ...         log('TopLayer.setUp')
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('TopLayer.tearDown')
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('TopLayer.testSetUp')
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('TopLayer.testTearDown')
        ...     testTearDown = classmethod(testTearDown)
        ...
        
        Tests or test suites specify what layer they need by storing a reference
        in the 'layer' attribute.
        
        >>> import unittest
        >>> class TestSpecifyingBaseLayer(unittest.TestCase):
        ...     'This TestCase explicitly specifies its layer'
        ...     layer = BaseLayer
        ...     name = 'TestSpecifyingBaseLayer' # For testing only
        ...
        ...     def setUp(self):
        ...         log('TestSpecifyingBaseLayer.setUp')
        ...
        ...     def tearDown(self):
        ...         log('TestSpecifyingBaseLayer.tearDown')
        ...
        ...     def test1(self):
        ...         log('TestSpecifyingBaseLayer.test1')
        ...
        ...     def test2(self):
        ...         log('TestSpecifyingBaseLayer.test2')
        ...
        >>> class TestSpecifyingNoLayer(unittest.TestCase):
        ...     'This TestCase specifies no layer'
        ...     name = 'TestSpecifyingNoLayer' # For testing only
        ...     def setUp(self):
        ...         log('TestSpecifyingNoLayer.setUp')
        ...
        ...     def tearDown(self):
        ...         log('TestSpecifyingNoLayer.tearDown')
        ...
        ...     def test1(self):
        ...         log('TestSpecifyingNoLayer.test')
        ...
        ...     def test2(self):
        ...         log('TestSpecifyingNoLayer.test')
        ...
        
        Create a TestSuite containing two test suites, one for each of
        TestSpecifyingBaseLayer and TestSpecifyingNoLayer.
        
        >>> umbrella_suite = unittest.TestSuite()
        >>> umbrella_suite.addTest(unittest.makeSuite(TestSpecifyingBaseLayer))
        >>> no_layer_suite = unittest.makeSuite(TestSpecifyingNoLayer)
        >>> umbrella_suite.addTest(no_layer_suite)
        
        Before we can run the tests, we need to setup some helpers.
        
        >>> from zope.testing.testrunner import options
        >>> from zope.testing.loggingsupport import InstalledHandler
        >>> import logging
        >>> log_handler = InstalledHandler('zope.testing.tests')
        >>> def log(msg):
        ...     logging.getLogger('zope.testing.tests').info(msg)
        >>> def fresh_options():
        ...     opts = options.get_options(['--test-filter', '.*'])
        ...     opts.resume_layer = None
        ...     opts.resume_number = 0
        ...     return opts
        
        Now we run the tests. Note that the BaseLayer was not setup when
        the TestSpecifyingNoLayer was run and setup/torn down around the
        TestSpecifyingBaseLayer tests.
        
        >>> from zope.testing.testrunner.runner import Runner
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running BaseLayer tests:
        Set up BaseLayer in N.NNN seconds.
        Ran 2 tests with 0 failures and 0 errors in N.NNN seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down BaseLayer in N.NNN seconds.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 2 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 4 tests, 0 failures, 0 errors in N.NNN seconds.
        
        
        Now lets specify a layer in the suite containing TestSpecifyingNoLayer
        and run the tests again. This demonstrates the other method of specifying
        a layer. This is generally how you specify what layer doctests need.
        
        >>> no_layer_suite.layer = BaseLayer
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running BaseLayer tests:
        Set up BaseLayer in N.NNN seconds.
        Ran 4 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down BaseLayer in N.NNN seconds.
        
        Clear our logged output, as we want to inspect it shortly.
        
        >>> log_handler.clear()
        
        Now lets also specify a layer in the TestSpecifyingNoLayer class and rerun
        the tests. This demonstrates that the most specific layer is used. It also
        shows the behavior of nested layers - because TopLayer extends BaseLayer,
        both the BaseLayer and TopLayer environments are setup when the
        TestSpecifyingNoLayer tests are run.
        
        >>> TestSpecifyingNoLayer.layer = TopLayer
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[umbrella_suite])
        >>> succeeded = runner.run()
        Running BaseLayer tests:
        Set up BaseLayer in N.NNN seconds.
        Ran 2 tests with 0 failures and 0 errors in N.NNN seconds.
        Running TopLayer tests:
        Set up TopLayer in N.NNN seconds.
        Ran 2 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down TopLayer in N.NNN seconds.
        Tear down BaseLayer in N.NNN seconds.
        Total: 4 tests, 0 failures, 0 errors in N.NNN seconds.
        
        
        If we inspect our trace of what methods got called in what order, we can
        see that the layer setup and teardown methods only got called once. We can
        also see that the layer's test setup and teardown methods got called for
        each test using that layer in the right order.
        
        >>> def report():
        ...     for record in log_handler.records:
        ...         print record.getMessage()
        >>> report()
        BaseLayer.setUp
        BaseLayer.testSetUp
        TestSpecifyingBaseLayer.setUp
        TestSpecifyingBaseLayer.test1
        TestSpecifyingBaseLayer.tearDown
        BaseLayer.testTearDown
        BaseLayer.testSetUp
        TestSpecifyingBaseLayer.setUp
        TestSpecifyingBaseLayer.test2
        TestSpecifyingBaseLayer.tearDown
        BaseLayer.testTearDown
        TopLayer.setUp
        BaseLayer.testSetUp
        TopLayer.testSetUp
        TestSpecifyingNoLayer.setUp
        TestSpecifyingNoLayer.test
        TestSpecifyingNoLayer.tearDown
        TopLayer.testTearDown
        BaseLayer.testTearDown
        BaseLayer.testSetUp
        TopLayer.testSetUp
        TestSpecifyingNoLayer.setUp
        TestSpecifyingNoLayer.test
        TestSpecifyingNoLayer.tearDown
        TopLayer.testTearDown
        BaseLayer.testTearDown
        TopLayer.tearDown
        BaseLayer.tearDown
        
        Now lets stack a few more layers to ensure that our setUp and tearDown
        methods are called in the correct order.
        
        >>> from zope.testing.testrunner.find import name_from_layer
        >>> class A(object):
        ...     def setUp(cls):
        ...         log('%s.setUp' % name_from_layer(cls))
        ...     setUp = classmethod(setUp)
        ...
        ...     def tearDown(cls):
        ...         log('%s.tearDown' % name_from_layer(cls))
        ...     tearDown = classmethod(tearDown)
        ...
        ...     def testSetUp(cls):
        ...         log('%s.testSetUp' % name_from_layer(cls))
        ...     testSetUp = classmethod(testSetUp)
        ...
        ...     def testTearDown(cls):
        ...         log('%s.testTearDown' % name_from_layer(cls))
        ...     testTearDown = classmethod(testTearDown)
        ...
        >>> class B(A): pass
        >>> class C(B): pass
        >>> class D(A): pass
        >>> class E(D): pass
        >>> class F(C,E): pass
        
        >>> class DeepTest(unittest.TestCase):
        ...     layer = F
        ...     def test(self):
        ...         pass
        >>> suite = unittest.makeSuite(DeepTest)
        >>> log_handler.clear()
        >>> runner = Runner(options=fresh_options(), args=[], found_suites=[suite])
        >>> succeeded = runner.run()
        Running F tests:
        Set up A in N.NNN seconds.
        Set up B in N.NNN seconds.
        Set up C in N.NNN seconds.
        Set up D in N.NNN seconds.
        Set up E in N.NNN seconds.
        Set up F in N.NNN seconds.
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down F in N.NNN seconds.
        Tear down E in N.NNN seconds.
        Tear down D in N.NNN seconds.
        Tear down C in N.NNN seconds.
        Tear down B in N.NNN seconds.
        Tear down A in N.NNN seconds.
        
        
        >>> report()
        A.setUp
        B.setUp
        C.setUp
        D.setUp
        E.setUp
        F.setUp
        A.testSetUp
        B.testSetUp
        C.testSetUp
        D.testSetUp
        E.testSetUp
        F.testSetUp
        F.testTearDown
        E.testTearDown
        D.testTearDown
        C.testTearDown
        B.testTearDown
        A.testTearDown
        F.tearDown
        E.tearDown
        D.tearDown
        C.tearDown
        B.tearDown
        A.tearDown
        
        Layer Selection
        ===============
        
        We can select which layers to run using the --layer option:
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test --layer 112 --layer Unit'.split()
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer112 tests:
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer112 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 226 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        
        We can also specify that we want to run only the unit tests:
        
        >>> sys.argv = 'test -u'.split()
        >>> testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Or that we want to run all of the tests except for the unit tests:
        
        >>> sys.argv = 'test -f'.split()
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer1 tests:
        Set up samplelayers.Layer1 in N.NNN seconds.
        Ran 9 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer11 tests:
        Set up samplelayers.Layer11 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer111 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer112 tests:
        Tear down samplelayers.Layer111 in N.NNN seconds.
        Set up samplelayers.Layer112 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer12 tests:
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer121 tests:
        Set up samplelayers.Layer121 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer122 tests:
        Tear down samplelayers.Layer121 in N.NNN seconds.
        Set up samplelayers.Layer122 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Total: 213 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        Or we can explicitly say that we want both unit and non-unit tests.
        
        >>> sys.argv = 'test -uf'.split()
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer1 tests:
        Set up samplelayers.Layer1 in N.NNN seconds.
        Ran 9 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer11 tests:
        Set up samplelayers.Layer11 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer111 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer112 tests:
        Tear down samplelayers.Layer111 in N.NNN seconds.
        Set up samplelayers.Layer112 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer12 tests:
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer121 tests:
        Set up samplelayers.Layer121 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer122 tests:
        Tear down samplelayers.Layer121 in N.NNN seconds.
        Set up samplelayers.Layer122 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down samplelayers.Layer122 in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 405 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        It is possible to force the layers to run in subprocesses and parallelize them.
        
        >>> sys.argv = [testrunner_script, '-j2']
        >>> testrunner.run_internal(defaults) # doctest: +REPORT_NDIFF
        Running samplelayers.Layer1 tests:
        Set up samplelayers.Layer1 in N.NNN seconds.
        Ran 9 tests with 0 failures and 0 errors in N.NNN seconds.
        Running samplelayers.Layer11 tests:
        Running in a subprocess.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer11 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running samplelayers.Layer111 tests:
        Running in a subprocess.
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer111 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer111 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running samplelayers.Layer112 tests:
        Running in a subprocess.
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer112 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running samplelayers.Layer12 tests:
        Running in a subprocess.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running samplelayers.Layer121 tests:
        Running in a subprocess.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Set up samplelayers.Layer121 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer121 in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running samplelayers.Layer122 tests:
        Running in a subprocess.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer12 in N.NNN seconds.
        Set up samplelayers.Layer122 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down samplelayers.Layer122 in N.NNN seconds.
        Tear down samplelayers.Layer12 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Running in a subprocess.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Total: 405 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        Passing arguments explicitly
        ============================
        
        In most of the examples here, we set up `sys.argv`.  In normal usage,
        the testrunner just uses `sys.argv`.  It is possible to pass arguments
        explicitly.
        
        >>> import os.path
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in N.NNN seconds.
        Set up samplelayers.Layer1 in N.NNN seconds.
        Set up samplelayers.Layer11 in N.NNN seconds.
        Set up samplelayers.Layer111 in N.NNN seconds.
        Ran 34 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer111 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        False
        
        If options already have default values, then passing a different default will
        override.
        
        For example, --list-tests defaults to being turned off, but if we pass in a
        different default, that one takes effect.
        
        >>> defaults = [
        ...     '--list-tests',
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults, 'test --layer 111'.split())
        Listing samplelayers.Layer111 tests:
        test_x1 (sample1.sampletests.test111.TestA)
        test_y0 (sample1.sampletests.test111.TestA)
        test_z0 (sample1.sampletests.test111.TestA)
        test_x0 (sample1.sampletests.test111.TestB)
        test_y1 (sample1.sampletests.test111.TestB)
        test_z0 (sample1.sampletests.test111.TestB)
        test_1 (sample1.sampletests.test111.TestNotMuch)
        test_2 (sample1.sampletests.test111.TestNotMuch)
        test_3 (sample1.sampletests.test111.TestNotMuch)
        test_x0 (sample1.sampletests.test111)
        test_y0 (sample1.sampletests.test111)
        test_z1 (sample1.sampletests.test111)
        /home/benji/workspace/zope.testing/1/src/zope/testing/testrunner/testrunner-ex/sample1/sampletests/../../sampletestsl.txt
        test_x1 (sampletests.test111.TestA)
        test_y0 (sampletests.test111.TestA)
        test_z0 (sampletests.test111.TestA)
        test_x0 (sampletests.test111.TestB)
        test_y1 (sampletests.test111.TestB)
        test_z0 (sampletests.test111.TestB)
        test_1 (sampletests.test111.TestNotMuch)
        test_2 (sampletests.test111.TestNotMuch)
        test_3 (sampletests.test111.TestNotMuch)
        test_x0 (sampletests.test111)
        test_y0 (sampletests.test111)
        test_z1 (sampletests.test111)
        /home/benji/workspace/zope.testing/1/src/zope/testing/testrunner/testrunner-ex/sampletests/../sampletestsl.txt
        False
        
        Verbose Output
        ==============
        
        Normally, we just get a summary.  We can use the -v option to get
        increasingly more information.
        
        If we use a single --verbose (-v) option, we get a dot printed for each
        test:
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        >>> sys.argv = 'test --layer 122 -v'.split()
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        ..................................
        Ran 34 tests with 0 failures and 0 errors in 0.007 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        If there are more than 50 tests, the dots are printed in groups of
        50:
        
        >>> sys.argv = 'test -uv'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        ................................................................................................................................................................................................
        Ran 192 tests with 0 failures and 0 errors in 0.035 seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        If the --verbose (-v) option is used twice, then the name and location of
        each test is printed as it is run:
        
        >>> sys.argv = 'test --layer 122 -vv'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        test_x1 (sample1.sampletests.test122.TestA)
        test_y0 (sample1.sampletests.test122.TestA)
        test_z0 (sample1.sampletests.test122.TestA)
        test_x0 (sample1.sampletests.test122.TestB)
        test_y1 (sample1.sampletests.test122.TestB)
        test_z0 (sample1.sampletests.test122.TestB)
        test_1 (sample1.sampletests.test122.TestNotMuch)
        test_2 (sample1.sampletests.test122.TestNotMuch)
        test_3 (sample1.sampletests.test122.TestNotMuch)
        test_x0 (sample1.sampletests.test122)
        test_y0 (sample1.sampletests.test122)
        test_z1 (sample1.sampletests.test122)
        testrunner-ex/sample1/sampletests/../../sampletestsl.txt
        test_x1 (sampletests.test122.TestA)
        test_y0 (sampletests.test122.TestA)
        test_z0 (sampletests.test122.TestA)
        test_x0 (sampletests.test122.TestB)
        test_y1 (sampletests.test122.TestB)
        test_z0 (sampletests.test122.TestB)
        test_1 (sampletests.test122.TestNotMuch)
        test_2 (sampletests.test122.TestNotMuch)
        test_3 (sampletests.test122.TestNotMuch)
        test_x0 (sampletests.test122)
        test_y0 (sampletests.test122)
        test_z1 (sampletests.test122)
        testrunner-ex/sampletests/../sampletestsl.txt
        Ran 34 tests with 0 failures and 0 errors in 0.009 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        if the --verbose (-v) option is used three times, then individual
        test-execution times are printed:
        
        >>> sys.argv = 'test --layer 122 -vvv'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        test_x1 (sample1.sampletests.test122.TestA) (0.000 s)
        test_y0 (sample1.sampletests.test122.TestA) (0.000 s)
        test_z0 (sample1.sampletests.test122.TestA) (0.000 s)
        test_x0 (sample1.sampletests.test122.TestB) (0.000 s)
        test_y1 (sample1.sampletests.test122.TestB) (0.000 s)
        test_z0 (sample1.sampletests.test122.TestB) (0.000 s)
        test_1 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
        test_2 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
        test_3 (sample1.sampletests.test122.TestNotMuch) (0.000 s)
        test_x0 (sample1.sampletests.test122) (0.001 s)
        test_y0 (sample1.sampletests.test122) (0.001 s)
        test_z1 (sample1.sampletests.test122) (0.001 s)
        testrunner-ex/sample1/sampletests/../../sampletestsl.txt (0.001 s)
        test_x1 (sampletests.test122.TestA) (0.000 s)
        test_y0 (sampletests.test122.TestA) (0.000 s)
        test_z0 (sampletests.test122.TestA) (0.000 s)
        test_x0 (sampletests.test122.TestB) (0.000 s)
        test_y1 (sampletests.test122.TestB) (0.000 s)
        test_z0 (sampletests.test122.TestB) (0.000 s)
        test_1 (sampletests.test122.TestNotMuch) (0.000 s)
        test_2 (sampletests.test122.TestNotMuch) (0.000 s)
        test_3 (sampletests.test122.TestNotMuch) (0.000 s)
        test_x0 (sampletests.test122) (0.001 s)
        test_y0 (sampletests.test122) (0.001 s)
        test_z1 (sampletests.test122) (0.001 s)
        testrunner-ex/sampletests/../sampletestsl.txt (0.001 s)
        Ran 34 tests with 0 failures and 0 errors in 0.009 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        Quiet output
        ------------
        
        The --quiet (-q) option cancels all verbose options.  It's useful when
        the default verbosity is non-zero:
        
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     '-v'
        ...     ]
        >>> sys.argv = 'test -q -u'.split()
        >>> testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 192 tests with 0 failures and 0 errors in 0.034 seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        Test Selection
        ==============
        
        We've already seen that we can select tests by layer.  There are three
        other ways we can select tests.  We can select tests by package:
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test --layer 122 -ssample1 -vv'.split()
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        test_x1 (sample1.sampletests.test122.TestA)
        test_y0 (sample1.sampletests.test122.TestA)
        test_z0 (sample1.sampletests.test122.TestA)
        test_x0 (sample1.sampletests.test122.TestB)
        test_y1 (sample1.sampletests.test122.TestB)
        test_z0 (sample1.sampletests.test122.TestB)
        test_1 (sample1.sampletests.test122.TestNotMuch)
        test_2 (sample1.sampletests.test122.TestNotMuch)
        test_3 (sample1.sampletests.test122.TestNotMuch)
        test_x0 (sample1.sampletests.test122)
        test_y0 (sample1.sampletests.test122)
        test_z1 (sample1.sampletests.test122)
        testrunner-ex/sample1/sampletests/../../sampletestsl.txt
        Ran 17 tests with 0 failures and 0 errors in 0.005 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        You can specify multiple packages:
        
        >>> sys.argv = 'test -u  -vv -ssample1 -ssample2'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_x1 (sample1.sampletestsf.TestA)
        test_y0 (sample1.sampletestsf.TestA)
        test_z0 (sample1.sampletestsf.TestA)
        test_x0 (sample1.sampletestsf.TestB)
        test_y1 (sample1.sampletestsf.TestB)
        test_z0 (sample1.sampletestsf.TestB)
        test_1 (sample1.sampletestsf.TestNotMuch)
        test_2 (sample1.sampletestsf.TestNotMuch)
        test_3 (sample1.sampletestsf.TestNotMuch)
        test_x0 (sample1.sampletestsf)
        test_y0 (sample1.sampletestsf)
        test_z1 (sample1.sampletestsf)
        testrunner-ex/sample1/../sampletests.txt
        test_x1 (sample1.sample11.sampletests.TestA)
        test_y0 (sample1.sample11.sampletests.TestA)
        test_z0 (sample1.sample11.sampletests.TestA)
        test_x0 (sample1.sample11.sampletests.TestB)
        test_y1 (sample1.sample11.sampletests.TestB)
        test_z0 (sample1.sample11.sampletests.TestB)
        test_1 (sample1.sample11.sampletests.TestNotMuch)
        test_2 (sample1.sample11.sampletests.TestNotMuch)
        test_3 (sample1.sample11.sampletests.TestNotMuch)
        test_x0 (sample1.sample11.sampletests)
        test_y0 (sample1.sample11.sampletests)
        test_z1 (sample1.sample11.sampletests)
        testrunner-ex/sample1/sample11/../../sampletests.txt
        test_x1 (sample1.sample13.sampletests.TestA)
        test_y0 (sample1.sample13.sampletests.TestA)
        test_z0 (sample1.sample13.sampletests.TestA)
        test_x0 (sample1.sample13.sampletests.TestB)
        test_y1 (sample1.sample13.sampletests.TestB)
        test_z0 (sample1.sample13.sampletests.TestB)
        test_1 (sample1.sample13.sampletests.TestNotMuch)
        test_2 (sample1.sample13.sampletests.TestNotMuch)
        test_3 (sample1.sample13.sampletests.TestNotMuch)
        test_x0 (sample1.sample13.sampletests)
        test_y0 (sample1.sample13.sampletests)
        test_z1 (sample1.sample13.sampletests)
        testrunner-ex/sample1/sample13/../../sampletests.txt
        test_x1 (sample1.sampletests.test1.TestA)
        test_y0 (sample1.sampletests.test1.TestA)
        test_z0 (sample1.sampletests.test1.TestA)
        test_x0 (sample1.sampletests.test1.TestB)
        test_y1 (sample1.sampletests.test1.TestB)
        test_z0 (sample1.sampletests.test1.TestB)
        test_1 (sample1.sampletests.test1.TestNotMuch)
        test_2 (sample1.sampletests.test1.TestNotMuch)
        test_3 (sample1.sampletests.test1.TestNotMuch)
        test_x0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test1)
        test_z1 (sample1.sampletests.test1)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        test_x1 (sample1.sampletests.test_one.TestA)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_z0 (sample1.sampletests.test_one.TestA)
        test_x0 (sample1.sampletests.test_one.TestB)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_z0 (sample1.sampletests.test_one.TestB)
        test_1 (sample1.sampletests.test_one.TestNotMuch)
        test_2 (sample1.sampletests.test_one.TestNotMuch)
        test_3 (sample1.sampletests.test_one.TestNotMuch)
        test_x0 (sample1.sampletests.test_one)
        test_y0 (sample1.sampletests.test_one)
        test_z1 (sample1.sampletests.test_one)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        test_x1 (sample2.sample21.sampletests.TestA)
        test_y0 (sample2.sample21.sampletests.TestA)
        test_z0 (sample2.sample21.sampletests.TestA)
        test_x0 (sample2.sample21.sampletests.TestB)
        test_y1 (sample2.sample21.sampletests.TestB)
        test_z0 (sample2.sample21.sampletests.TestB)
        test_1 (sample2.sample21.sampletests.TestNotMuch)
        test_2 (sample2.sample21.sampletests.TestNotMuch)
        test_3 (sample2.sample21.sampletests.TestNotMuch)
        test_x0 (sample2.sample21.sampletests)
        test_y0 (sample2.sample21.sampletests)
        test_z1 (sample2.sample21.sampletests)
        testrunner-ex/sample2/sample21/../../sampletests.txt
        test_x1 (sample2.sampletests.test_1.TestA)
        test_y0 (sample2.sampletests.test_1.TestA)
        test_z0 (sample2.sampletests.test_1.TestA)
        test_x0 (sample2.sampletests.test_1.TestB)
        test_y1 (sample2.sampletests.test_1.TestB)
        test_z0 (sample2.sampletests.test_1.TestB)
        test_1 (sample2.sampletests.test_1.TestNotMuch)
        test_2 (sample2.sampletests.test_1.TestNotMuch)
        test_3 (sample2.sampletests.test_1.TestNotMuch)
        test_x0 (sample2.sampletests.test_1)
        test_y0 (sample2.sampletests.test_1)
        test_z1 (sample2.sampletests.test_1)
        testrunner-ex/sample2/sampletests/../../sampletests.txt
        test_x1 (sample2.sampletests.testone.TestA)
        test_y0 (sample2.sampletests.testone.TestA)
        test_z0 (sample2.sampletests.testone.TestA)
        test_x0 (sample2.sampletests.testone.TestB)
        test_y1 (sample2.sampletests.testone.TestB)
        test_z0 (sample2.sampletests.testone.TestB)
        test_1 (sample2.sampletests.testone.TestNotMuch)
        test_2 (sample2.sampletests.testone.TestNotMuch)
        test_3 (sample2.sampletests.testone.TestNotMuch)
        test_x0 (sample2.sampletests.testone)
        test_y0 (sample2.sampletests.testone)
        test_z1 (sample2.sampletests.testone)
        testrunner-ex/sample2/sampletests/../../sampletests.txt
        Ran 128 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        You can specify directory names instead of packages (useful for
        tab-completion):
        
        >>> subdir = os.path.join(directory_with_tests, 'sample1')
        >>> sys.argv = ['test', '--layer', '122', '-s', subdir, '-vv']
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        test_x1 (sample1.sampletests.test122.TestA)
        test_y0 (sample1.sampletests.test122.TestA)
        test_z0 (sample1.sampletests.test122.TestA)
        test_x0 (sample1.sampletests.test122.TestB)
        test_y1 (sample1.sampletests.test122.TestB)
        test_z0 (sample1.sampletests.test122.TestB)
        test_1 (sample1.sampletests.test122.TestNotMuch)
        test_2 (sample1.sampletests.test122.TestNotMuch)
        test_3 (sample1.sampletests.test122.TestNotMuch)
        test_x0 (sample1.sampletests.test122)
        test_y0 (sample1.sampletests.test122)
        test_z1 (sample1.sampletests.test122)
        testrunner-ex/sample1/sampletests/../../sampletestsl.txt
        Ran 17 tests with 0 failures and 0 errors in 0.005 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        We can select by test module name using the --module (-m) option:
        
        >>> sys.argv = 'test -u  -vv -ssample1 -m_one -mtest1'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_x1 (sample1.sampletests.test1.TestA)
        test_y0 (sample1.sampletests.test1.TestA)
        test_z0 (sample1.sampletests.test1.TestA)
        test_x0 (sample1.sampletests.test1.TestB)
        test_y1 (sample1.sampletests.test1.TestB)
        test_z0 (sample1.sampletests.test1.TestB)
        test_1 (sample1.sampletests.test1.TestNotMuch)
        test_2 (sample1.sampletests.test1.TestNotMuch)
        test_3 (sample1.sampletests.test1.TestNotMuch)
        test_x0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test1)
        test_z1 (sample1.sampletests.test1)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        test_x1 (sample1.sampletests.test_one.TestA)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_z0 (sample1.sampletests.test_one.TestA)
        test_x0 (sample1.sampletests.test_one.TestB)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_z0 (sample1.sampletests.test_one.TestB)
        test_1 (sample1.sampletests.test_one.TestNotMuch)
        test_2 (sample1.sampletests.test_one.TestNotMuch)
        test_3 (sample1.sampletests.test_one.TestNotMuch)
        test_x0 (sample1.sampletests.test_one)
        test_y0 (sample1.sampletests.test_one)
        test_z1 (sample1.sampletests.test_one)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        Ran 32 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        and by test within the module using the --test (-t) option:
        
        >>> sys.argv = 'test -u  -vv -ssample1 -m_one -mtest1 -tx0 -ty0'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_y0 (sample1.sampletests.test1.TestA)
        test_x0 (sample1.sampletests.test1.TestB)
        test_x0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_x0 (sample1.sampletests.test_one.TestB)
        test_x0 (sample1.sampletests.test_one)
        test_y0 (sample1.sampletests.test_one)
        Ran 8 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        >>> sys.argv = 'test -u  -vv -ssample1 -ttxt'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        testrunner-ex/sample1/../sampletests.txt
        testrunner-ex/sample1/sample11/../../sampletests.txt
        testrunner-ex/sample1/sample13/../../sampletests.txt
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        Ran 20 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        The --module and --test options take regular expressions.  If the
        regular expressions specified begin with '!', then tests that don't
        match the regular expression are selected:
        
        >>> sys.argv = 'test -u  -vv -ssample1 -m!sample1[.]sample1'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_x1 (sample1.sampletestsf.TestA)
        test_y0 (sample1.sampletestsf.TestA)
        test_z0 (sample1.sampletestsf.TestA)
        test_x0 (sample1.sampletestsf.TestB)
        test_y1 (sample1.sampletestsf.TestB)
        test_z0 (sample1.sampletestsf.TestB)
        test_1 (sample1.sampletestsf.TestNotMuch)
        test_2 (sample1.sampletestsf.TestNotMuch)
        test_3 (sample1.sampletestsf.TestNotMuch)
        test_x0 (sample1.sampletestsf)
        test_y0 (sample1.sampletestsf)
        test_z1 (sample1.sampletestsf)
        testrunner-ex/sample1/../sampletests.txt
        test_x1 (sample1.sampletests.test1.TestA)
        test_y0 (sample1.sampletests.test1.TestA)
        test_z0 (sample1.sampletests.test1.TestA)
        test_x0 (sample1.sampletests.test1.TestB)
        test_y1 (sample1.sampletests.test1.TestB)
        test_z0 (sample1.sampletests.test1.TestB)
        test_1 (sample1.sampletests.test1.TestNotMuch)
        test_2 (sample1.sampletests.test1.TestNotMuch)
        test_3 (sample1.sampletests.test1.TestNotMuch)
        test_x0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test1)
        test_z1 (sample1.sampletests.test1)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        test_x1 (sample1.sampletests.test_one.TestA)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_z0 (sample1.sampletests.test_one.TestA)
        test_x0 (sample1.sampletests.test_one.TestB)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_z0 (sample1.sampletests.test_one.TestB)
        test_1 (sample1.sampletests.test_one.TestNotMuch)
        test_2 (sample1.sampletests.test_one.TestNotMuch)
        test_3 (sample1.sampletests.test_one.TestNotMuch)
        test_x0 (sample1.sampletests.test_one)
        test_y0 (sample1.sampletests.test_one)
        test_z1 (sample1.sampletests.test_one)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        Ran 48 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Module and test filters can also be given as positional arguments:
        
        
        >>> sys.argv = 'test -u  -vv -ssample1 !sample1[.]sample1'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_x1 (sample1.sampletestsf.TestA)
        test_y0 (sample1.sampletestsf.TestA)
        test_z0 (sample1.sampletestsf.TestA)
        test_x0 (sample1.sampletestsf.TestB)
        test_y1 (sample1.sampletestsf.TestB)
        test_z0 (sample1.sampletestsf.TestB)
        test_1 (sample1.sampletestsf.TestNotMuch)
        test_2 (sample1.sampletestsf.TestNotMuch)
        test_3 (sample1.sampletestsf.TestNotMuch)
        test_x0 (sample1.sampletestsf)
        test_y0 (sample1.sampletestsf)
        test_z1 (sample1.sampletestsf)
        testrunner-ex/sample1/../sampletests.txt
        test_x1 (sample1.sampletests.test1.TestA)
        test_y0 (sample1.sampletests.test1.TestA)
        test_z0 (sample1.sampletests.test1.TestA)
        test_x0 (sample1.sampletests.test1.TestB)
        test_y1 (sample1.sampletests.test1.TestB)
        test_z0 (sample1.sampletests.test1.TestB)
        test_1 (sample1.sampletests.test1.TestNotMuch)
        test_2 (sample1.sampletests.test1.TestNotMuch)
        test_3 (sample1.sampletests.test1.TestNotMuch)
        test_x0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test1)
        test_z1 (sample1.sampletests.test1)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        test_x1 (sample1.sampletests.test_one.TestA)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_z0 (sample1.sampletests.test_one.TestA)
        test_x0 (sample1.sampletests.test_one.TestB)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_z0 (sample1.sampletests.test_one.TestB)
        test_1 (sample1.sampletests.test_one.TestNotMuch)
        test_2 (sample1.sampletests.test_one.TestNotMuch)
        test_3 (sample1.sampletests.test_one.TestNotMuch)
        test_x0 (sample1.sampletests.test_one)
        test_y0 (sample1.sampletests.test_one)
        test_z1 (sample1.sampletests.test_one)
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        Ran 48 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        >>> sys.argv = 'test -u  -vv -ssample1 . txt'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        testrunner-ex/sample1/../sampletests.txt
        testrunner-ex/sample1/sample11/../../sampletests.txt
        testrunner-ex/sample1/sample13/../../sampletests.txt
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        testrunner-ex/sample1/sampletests/../../sampletests.txt
        Ran 20 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        Sometimes, There are tests that you don't want to run by default.
        For example, you might have tests that take a long time.  Tests can
        have a level attribute.  If no level is specified, a level of 1 is
        assumed and, by default, only tests at level one are run.  to run
        tests at a higher level, use the --at-level (-a) option to specify a higher
        level.  For example, with the following options:
        
        
        >>> sys.argv = 'test -u  -vv -t test_y1 -t test_y0'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_y0 (sampletestsf.TestA)
        test_y1 (sampletestsf.TestB)
        test_y0 (sampletestsf)
        test_y0 (sample1.sampletestsf.TestA)
        test_y1 (sample1.sampletestsf.TestB)
        test_y0 (sample1.sampletestsf)
        test_y0 (sample1.sample11.sampletests.TestA)
        test_y1 (sample1.sample11.sampletests.TestB)
        test_y0 (sample1.sample11.sampletests)
        test_y0 (sample1.sample13.sampletests.TestA)
        test_y1 (sample1.sample13.sampletests.TestB)
        test_y0 (sample1.sample13.sampletests)
        test_y0 (sample1.sampletests.test1.TestA)
        test_y1 (sample1.sampletests.test1.TestB)
        test_y0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_y0 (sample1.sampletests.test_one)
        test_y0 (sample2.sample21.sampletests.TestA)
        test_y1 (sample2.sample21.sampletests.TestB)
        test_y0 (sample2.sample21.sampletests)
        test_y0 (sample2.sampletests.test_1.TestA)
        test_y1 (sample2.sampletests.test_1.TestB)
        test_y0 (sample2.sampletests.test_1)
        test_y0 (sample2.sampletests.testone.TestA)
        test_y1 (sample2.sampletests.testone.TestB)
        test_y0 (sample2.sampletests.testone)
        test_y0 (sample3.sampletests.TestA)
        test_y1 (sample3.sampletests.TestB)
        test_y0 (sample3.sampletests)
        test_y0 (sampletests.test1.TestA)
        test_y1 (sampletests.test1.TestB)
        test_y0 (sampletests.test1)
        test_y0 (sampletests.test_one.TestA)
        test_y1 (sampletests.test_one.TestB)
        test_y0 (sampletests.test_one)
        Ran 36 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        We get run 36 tests.  If we specify a level of 2, we get some
        additional tests:
        
        >>> sys.argv = 'test -u  -vv -a 2 -t test_y1 -t test_y0'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 2
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_y0 (sampletestsf.TestA)
        test_y0 (sampletestsf.TestA2)
        test_y1 (sampletestsf.TestB)
        test_y0 (sampletestsf)
        test_y0 (sample1.sampletestsf.TestA)
        test_y1 (sample1.sampletestsf.TestB)
        test_y0 (sample1.sampletestsf)
        test_y0 (sample1.sample11.sampletests.TestA)
        test_y1 (sample1.sample11.sampletests.TestB)
        test_y1 (sample1.sample11.sampletests.TestB2)
        test_y0 (sample1.sample11.sampletests)
        test_y0 (sample1.sample13.sampletests.TestA)
        test_y1 (sample1.sample13.sampletests.TestB)
        test_y0 (sample1.sample13.sampletests)
        test_y0 (sample1.sampletests.test1.TestA)
        test_y1 (sample1.sampletests.test1.TestB)
        test_y0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_y0 (sample1.sampletests.test_one)
        test_y0 (sample2.sample21.sampletests.TestA)
        test_y1 (sample2.sample21.sampletests.TestB)
        test_y0 (sample2.sample21.sampletests)
        test_y0 (sample2.sampletests.test_1.TestA)
        test_y1 (sample2.sampletests.test_1.TestB)
        test_y0 (sample2.sampletests.test_1)
        test_y0 (sample2.sampletests.testone.TestA)
        test_y1 (sample2.sampletests.testone.TestB)
        test_y0 (sample2.sampletests.testone)
        test_y0 (sample3.sampletests.TestA)
        test_y1 (sample3.sampletests.TestB)
        test_y0 (sample3.sampletests)
        test_y0 (sampletests.test1.TestA)
        test_y1 (sampletests.test1.TestB)
        test_y0 (sampletests.test1)
        test_y0 (sampletests.test_one.TestA)
        test_y1 (sampletests.test_one.TestB)
        test_y0 (sampletests.test_one)
        Ran 38 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        We can use the --all option to run tests at all levels:
        
        >>> sys.argv = 'test -u  -vv --all -t test_y1 -t test_y0'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at all levels
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test_y0 (sampletestsf.TestA)
        test_y0 (sampletestsf.TestA2)
        test_y1 (sampletestsf.TestB)
        test_y0 (sampletestsf)
        test_y0 (sample1.sampletestsf.TestA)
        test_y1 (sample1.sampletestsf.TestB)
        test_y0 (sample1.sampletestsf)
        test_y0 (sample1.sample11.sampletests.TestA)
        test_y0 (sample1.sample11.sampletests.TestA3)
        test_y1 (sample1.sample11.sampletests.TestB)
        test_y1 (sample1.sample11.sampletests.TestB2)
        test_y0 (sample1.sample11.sampletests)
        test_y0 (sample1.sample13.sampletests.TestA)
        test_y1 (sample1.sample13.sampletests.TestB)
        test_y0 (sample1.sample13.sampletests)
        test_y0 (sample1.sampletests.test1.TestA)
        test_y1 (sample1.sampletests.test1.TestB)
        test_y0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_y1 (sample1.sampletests.test_one.TestB)
        test_y0 (sample1.sampletests.test_one)
        test_y0 (sample2.sample21.sampletests.TestA)
        test_y1 (sample2.sample21.sampletests.TestB)
        test_y0 (sample2.sample21.sampletests)
        test_y0 (sample2.sampletests.test_1.TestA)
        test_y1 (sample2.sampletests.test_1.TestB)
        test_y0 (sample2.sampletests.test_1)
        test_y0 (sample2.sampletests.testone.TestA)
        test_y1 (sample2.sampletests.testone.TestB)
        test_y0 (sample2.sampletests.testone)
        test_y0 (sample3.sampletests.TestA)
        test_y1 (sample3.sampletests.TestB)
        test_y0 (sample3.sampletests)
        test_y0 (sampletests.test1.TestA)
        test_y1 (sampletests.test1.TestB)
        test_y0 (sampletests.test1)
        test_y0 (sampletests.test_one.TestA)
        test_y1 (sampletests.test_one.TestB)
        test_y0 (sampletests.test_one)
        Ran 39 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Listing Selected Tests
        ----------------------
        
        When you're trying to figure out why the test you want is not matched by the
        pattern you specified, it is convenient to see which tests match your
        specifications.
        
        >>> sys.argv = 'test --all -m sample1 -t test_y0 --list-tests'.split()
        >>> testrunner.run_internal(defaults)
        Listing samplelayers.Layer11 tests:
        test_y0 (sample1.sampletests.test11.TestA)
        test_y0 (sample1.sampletests.test11)
        Listing samplelayers.Layer111 tests:
        test_y0 (sample1.sampletests.test111.TestA)
        test_y0 (sample1.sampletests.test111)
        Listing samplelayers.Layer112 tests:
        test_y0 (sample1.sampletests.test112.TestA)
        test_y0 (sample1.sampletests.test112)
        Listing samplelayers.Layer12 tests:
        test_y0 (sample1.sampletests.test12.TestA)
        test_y0 (sample1.sampletests.test12)
        Listing samplelayers.Layer121 tests:
        test_y0 (sample1.sampletests.test121.TestA)
        test_y0 (sample1.sampletests.test121)
        Listing samplelayers.Layer122 tests:
        test_y0 (sample1.sampletests.test122.TestA)
        test_y0 (sample1.sampletests.test122)
        Listing zope.testing.testrunner.layer.UnitTests tests:
        test_y0 (sample1.sampletestsf.TestA)
        test_y0 (sample1.sampletestsf)
        test_y0 (sample1.sample11.sampletests.TestA)
        test_y0 (sample1.sample11.sampletests.TestA3)
        test_y0 (sample1.sample11.sampletests)
        test_y0 (sample1.sample13.sampletests.TestA)
        test_y0 (sample1.sample13.sampletests)
        test_y0 (sample1.sampletests.test1.TestA)
        test_y0 (sample1.sampletests.test1)
        test_y0 (sample1.sampletests.test_one.TestA)
        test_y0 (sample1.sampletests.test_one)
        False
        
        Test Progress
        =============
        
        If the --progress (-p) option is used, progress information is printed and
        a carriage return (rather than a new-line) is printed between
        detail lines.  Let's look at the effect of --progress (-p) at different
        levels of verbosity.
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test --layer 122 -p'.split()
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        1/34 (2.9%)##r##
        ##r##
        2/34 (5.9%)##r##
        ##r##
        3/34 (8.8%)##r##
        ##r##
        4/34 (11.8%)##r##
        ##r##
        5/34 (14.7%)##r##
        ##r##
        6/34 (17.6%)##r##
        ##r##
        7/34 (20.6%)##r##
        ##r##
        8/34 (23.5%)##r##
        ##r##
        9/34 (26.5%)##r##
        ##r##
        10/34 (29.4%)##r##
        ##r##
        11/34 (32.4%)##r##
        ##r##
        12/34 (35.3%)##r##
        ##r##
        17/34 (50.0%)##r##
        ##r##
        18/34 (52.9%)##r##
        ##r##
        19/34 (55.9%)##r##
        ##r##
        20/34 (58.8%)##r##
        ##r##
        21/34 (61.8%)##r##
        ##r##
        22/34 (64.7%)##r##
        ##r##
        23/34 (67.6%)##r##
        ##r##
        24/34 (70.6%)##r##
        ##r##
        25/34 (73.5%)##r##
        ##r##
        26/34 (76.5%)##r##
        ##r##
        27/34 (79.4%)##r##
        ##r##
        28/34 (82.4%)##r##
        ##r##
        29/34 (85.3%)##r##
        ##r##
        34/34 (100.0%)##r##
        ##r##
        Ran 34 tests with 0 failures and 0 errors in 0.008 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        (Note that, in the examples above and below, we show "##r##" followed by
        new lines where carriage returns would appear in actual output.)
        
        Using a single level of verbosity causes test descriptions to be
        output, but only if they fit in the terminal width.  The default
        width, when the terminal width can't be determined, is 80:
        
        >>> sys.argv = 'test --layer 122 -pv'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        1/34 (2.9%) test_x1 (sample1.sampletests.test122.TestA)##r##
        ##r##
        2/34 (5.9%) test_y0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        3/34 (8.8%) test_z0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        4/34 (11.8%) test_x0 (sample1.sampletests.test122.TestB)##r##
        ##r##
        5/34 (14.7%) test_y1 (sample1.sampletests.test122.TestB)##r##
        ##r##
        6/34 (17.6%) test_z0 (sample1.sampletests.test122.TestB)##r##
        ##r##
        7/34 (20.6%) test_1 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        8/34 (23.5%) test_2 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        9/34 (26.5%) test_3 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        10/34 (29.4%) test_x0 (sample1.sampletests.test122)##r##
        ##r##
        11/34 (32.4%) test_y0 (sample1.sampletests.test122)##r##
        ##r##
        12/34 (35.3%) test_z1 (sample1.sampletests.test122)##r##
        ##r##
        17/34 (50.0%) ... /testrunner-ex/sample1/sampletests/../../sampletestsl.txt##r##
        ##r##
        18/34 (52.9%) test_x1 (sampletests.test122.TestA)##r##
        ##r##
        19/34 (55.9%) test_y0 (sampletests.test122.TestA)##r##
        ##r##
        20/34 (58.8%) test_z0 (sampletests.test122.TestA)##r##
        ##r##
        21/34 (61.8%) test_x0 (sampletests.test122.TestB)##r##
        ##r##
        22/34 (64.7%) test_y1 (sampletests.test122.TestB)##r##
        ##r##
        23/34 (67.6%) test_z0 (sampletests.test122.TestB)##r##
        ##r##
        24/34 (70.6%) test_1 (sampletests.test122.TestNotMuch)##r##
        ##r##
        25/34 (73.5%) test_2 (sampletests.test122.TestNotMuch)##r##
        ##r##
        26/34 (76.5%) test_3 (sampletests.test122.TestNotMuch)##r##
        ##r##
        27/34 (79.4%) test_x0 (sampletests.test122)##r##
        ##r##
        28/34 (82.4%) test_y0 (sampletests.test122)##r##
        ##r##
        29/34 (85.3%) test_z1 (sampletests.test122)##r##
        ##r##
        34/34 (100.0%) ... pe/testing/testrunner-ex/sampletests/../sampletestsl.txt##r##
        ##r##
        Ran 34 tests with 0 failures and 0 errors in 0.008 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        The terminal width is determined using the curses module.  To see
        that, we'll provide a fake curses module:
        
        >>> class FakeCurses:
        ...     def setupterm(self):
        ...         pass
        ...     def tigetnum(self, ignored):
        ...         return 60
        >>> old_curses = sys.modules.get('curses')
        >>> sys.modules['curses'] = FakeCurses()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        1/34 (2.9%) test_x1 (sample1.sampletests.test122.TestA)##r##
        ##r##
        2/34 (5.9%) test_y0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        3/34 (8.8%) test_z0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        4/34 (11.8%) test_x0 (...le1.sampletests.test122.TestB)##r##
        ##r##
        5/34 (14.7%) test_y1 (...le1.sampletests.test122.TestB)##r##
        ##r##
        6/34 (17.6%) test_z0 (...le1.sampletests.test122.TestB)##r##
        ##r##
        7/34 (20.6%) test_1 (...ampletests.test122.TestNotMuch)##r##
        ##r##
        8/34 (23.5%) test_2 (...ampletests.test122.TestNotMuch)##r##
        ##r##
        9/34 (26.5%) test_3 (...ampletests.test122.TestNotMuch)##r##
        ##r##
        10/34 (29.4%) test_x0 (sample1.sampletests.test122)##r##
        ##r##
        11/34 (32.4%) test_y0 (sample1.sampletests.test122)##r##
        ##r##
        12/34 (35.3%) test_z1 (sample1.sampletests.test122)##r##
        ##r##
        17/34 (50.0%) ... e1/sampletests/../../sampletestsl.txt##r##
        ##r##
        18/34 (52.9%) test_x1 (sampletests.test122.TestA)##r##
        ##r##
        19/34 (55.9%) test_y0 (sampletests.test122.TestA)##r##
        ##r##
        20/34 (58.8%) test_z0 (sampletests.test122.TestA)##r##
        ##r##
        21/34 (61.8%) test_x0 (sampletests.test122.TestB)##r##
        ##r##
        22/34 (64.7%) test_y1 (sampletests.test122.TestB)##r##
        ##r##
        23/34 (67.6%) test_z0 (sampletests.test122.TestB)##r##
        ##r##
        24/34 (70.6%) test_1 (sampletests.test122.TestNotMuch)##r##
        ##r##
        25/34 (73.5%) test_2 (sampletests.test122.TestNotMuch)##r##
        ##r##
        26/34 (76.5%) test_3 (sampletests.test122.TestNotMuch)##r##
        ##r##
        27/34 (79.4%) test_x0 (sampletests.test122)##r##
        ##r##
        28/34 (82.4%) test_y0 (sampletests.test122)##r##
        ##r##
        29/34 (85.3%) test_z1 (sampletests.test122)##r##
        ##r##
        34/34 (100.0%) ... r-ex/sampletests/../sampletestsl.txt##r##
        ##r##
        Ran 34 tests with 0 failures and 0 errors in 0.008 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        >>> sys.modules['curses'] = old_curses
        
        If a second or third level of verbosity are added, we get additional
        information.
        
        >>> sys.argv = 'test --layer 122 -pvv -t !txt'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        1/24 (4.2%) test_x1 (sample1.sampletests.test122.TestA)##r##
        ##r##
        2/24 (8.3%) test_y0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        3/24 (12.5%) test_z0 (sample1.sampletests.test122.TestA)##r##
        ##r##
        4/24 (16.7%) test_x0 (sample1.sampletests.test122.TestB)##r##
        ##r##
        5/24 (20.8%) test_y1 (sample1.sampletests.test122.TestB)##r##
        ##r##
        6/24 (25.0%) test_z0 (sample1.sampletests.test122.TestB)##r##
        ##r##
        7/24 (29.2%) test_1 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        8/24 (33.3%) test_2 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        9/24 (37.5%) test_3 (sample1.sampletests.test122.TestNotMuch)##r##
        ##r##
        10/24 (41.7%) test_x0 (sample1.sampletests.test122)##r##
        ##r##
        11/24 (45.8%) test_y0 (sample1.sampletests.test122)##r##
        ##r##
        12/24 (50.0%) test_z1 (sample1.sampletests.test122)##r##
        ##r##
        13/24 (54.2%) test_x1 (sampletests.test122.TestA)##r##
        ##r##
        14/24 (58.3%) test_y0 (sampletests.test122.TestA)##r##
        ##r##
        15/24 (62.5%) test_z0 (sampletests.test122.TestA)##r##
        ##r##
        16/24 (66.7%) test_x0 (sampletests.test122.TestB)##r##
        ##r##
        17/24 (70.8%) test_y1 (sampletests.test122.TestB)##r##
        ##r##
        18/24 (75.0%) test_z0 (sampletests.test122.TestB)##r##
        ##r##
        19/24 (79.2%) test_1 (sampletests.test122.TestNotMuch)##r##
        ##r##
        20/24 (83.3%) test_2 (sampletests.test122.TestNotMuch)##r##
        ##r##
        21/24 (87.5%) test_3 (sampletests.test122.TestNotMuch)##r##
        ##r##
        22/24 (91.7%) test_x0 (sampletests.test122)##r##
        ##r##
        23/24 (95.8%) test_y0 (sampletests.test122)##r##
        ##r##
        24/24 (100.0%) test_z1 (sampletests.test122)##r##
        ##r##
        Ran 24 tests with 0 failures and 0 errors in 0.006 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        Note that, in this example, we used a test-selection pattern starting
        with '!' to exclude tests containing the string "txt".
        
        >>> sys.argv = 'test --layer 122 -pvvv -t!(txt|NotMuch)'.split()
        >>> testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer122 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Running:
        1/18 (5.6%) test_x1 (sample1.sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        2/18 (11.1%) test_y0 (sample1.sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        3/18 (16.7%) test_z0 (sample1.sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        4/18 (22.2%) test_x0 (sample1.sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        5/18 (27.8%) test_y1 (sample1.sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        6/18 (33.3%) test_z0 (sample1.sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        7/18 (38.9%) test_x0 (sample1.sampletests.test122) (0.001 s)##r##
        ##r##
        8/18 (44.4%) test_y0 (sample1.sampletests.test122) (0.001 s)##r##
        ##r##
        9/18 (50.0%) test_z1 (sample1.sampletests.test122) (0.001 s)##r##
        ##r##
        10/18 (55.6%) test_x1 (sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        11/18 (61.1%) test_y0 (sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        12/18 (66.7%) test_z0 (sampletests.test122.TestA) (0.000 s)##r##
        ##r##
        13/18 (72.2%) test_x0 (sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        14/18 (77.8%) test_y1 (sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        15/18 (83.3%) test_z0 (sampletests.test122.TestB) (0.000 s)##r##
        ##r##
        16/18 (88.9%) test_x0 (sampletests.test122) (0.001 s)##r##
        ##r##
        17/18 (94.4%) test_y0 (sampletests.test122) (0.001 s)##r##
        ##r##
        18/18 (100.0%) test_z1 (sampletests.test122) (0.001 s)##r##
        ##r##
        Ran 18 tests with 0 failures and 0 errors in 0.006 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        False
        
        In this example, we also excluded tests with "NotMuch" in their names.
        
        Unfortunately, the time data above doesn't buy us much because, in
        practice, the line is cleared before there is time to see the
        times. :/
        
        
        Autodetecting progress
        ----------------------
        
        The --auto-progress option will determine if stdout is a terminal, and only enable
        progress output if so.
        
        Let's pretend we have a terminal
        
        >>> class Terminal(object):
        ...     def __init__(self, stream):
        ...         self._stream = stream
        ...     def __getattr__(self, attr):
        ...         return getattr(self._stream, attr)
        ...     def isatty(self):
        ...         return True
        >>> real_stdout = sys.stdout
        >>> sys.stdout = Terminal(sys.stdout)
        
        >>> sys.argv = 'test -u -t test_one.TestNotMuch --auto-progress'.split()
        >>> testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        1/6 (16.7%)##r##
        ##r##
        2/6 (33.3%)##r##
        ##r##
        3/6 (50.0%)##r##
        ##r##
        4/6 (66.7%)##r##
        ##r##
        5/6 (83.3%)##r##
        ##r##
        6/6 (100.0%)##r##
        ##r##
        Ran 6 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Let's stop pretending
        
        >>> sys.stdout = real_stdout
        
        >>> sys.argv = 'test -u -t test_one.TestNotMuch --auto-progress'.split()
        >>> testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 6 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Disabling progress indication
        -----------------------------
        
        If -p or --progress have been previously provided on the command line (perhaps by a
        wrapper script) but you do not desire progress indication, you can switch it off with
        --no-progress:
        
        >>> sys.argv = 'test -u -t test_one.TestNotMuch -p --no-progress'.split()
        >>> testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Ran 6 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        Debugging
        =========
        
        The testrunner module supports post-mortem debugging and debugging
        using `pdb.set_trace`.  Let's look first at using `pdb.set_trace`.
        To demonstrate this, we'll provide input via helper Input objects:
        
        >>> class Input:
        ...     def __init__(self, src):
        ...         self.lines = src.split('\n')
        ...     def readline(self):
        ...         line = self.lines.pop(0)
        ...         print line
        ...         return line+'\n'
        
        If a test or code called by a test calls pdb.set_trace, then the
        runner will enter pdb at that point:
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> from zope.testing import testrunner
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> real_stdin = sys.stdin
        >>> if sys.version_info[:2] == (2, 3):
        ...     sys.stdin = Input('n\np x\nc')
        ... else:
        ...     sys.stdin = Input('p x\nc')
        
        >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
        ...             ' -t set_trace1').split()
        >>> try: testrunner.run_internal(defaults)
        ... finally: sys.stdin = real_stdin
        ... # doctest: +ELLIPSIS
        Running zope.testing.testrunner.layer.UnitTests tests:
        ...
        > testrunner-ex/sample3/sampletests_d.py(27)test_set_trace1()
        -> y = x
        (Pdb) p x
        1
        (Pdb) c
        Ran 1 tests with 0 failures and 0 errors in 0.001 seconds.
        ...
        False
        
        Note that, prior to Python 2.4, calling pdb.set_trace caused pdb to
        break in the pdb.set_trace function.  It was necessary to use 'next'
        or 'up' to get to the application code that called pdb.set_trace.  In
        Python 2.4, pdb.set_trace causes pdb to stop right after the call to
        pdb.set_trace.
        
        You can also do post-mortem debugging, using the --post-mortem (-D)
        option:
        
        >>> sys.stdin = Input('p x\nc')
        >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
        ...             ' -t post_mortem1 -D').split()
        >>> try: testrunner.run_internal(defaults)
        ... finally: sys.stdin = real_stdin
        ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF
        Running zope.testing.testrunner.layer.UnitTests tests:
        ...
        Error in test test_post_mortem1 (sample3.sampletests_d.TestSomething)
        Traceback (most recent call last):
        File "testrunner-ex/sample3/sampletests_d.py",
        line 34, in test_post_mortem1
        raise ValueError
        ValueError
        <BLANKLINE>
        exceptions.ValueError:
        <BLANKLINE>
        > testrunner-ex/sample3/sampletests_d.py(34)test_post_mortem1()
        -> raise ValueError
        (Pdb) p x
        1
        (Pdb) c
        True
        
        Note that the test runner exits after post-mortem debugging.
        
        In the example above, we debugged an error.  Failures are actually
        converted to errors and can be debugged the same way:
        
        >>> sys.stdin = Input('p x\np y\nc')
        >>> sys.argv = ('test -ssample3 --tests-pattern ^sampletests_d$'
        ...             ' -t post_mortem_failure1 -D').split()
        >>> try: testrunner.run_internal(defaults)
        ... finally: sys.stdin = real_stdin
        ... # doctest: +NORMALIZE_WHITESPACE +REPORT_NDIFF
        Running zope.testing.testrunner.layer.UnitTests tests:
        ...
        Error in test test_post_mortem_failure1 (sample3.sampletests_d.TestSomething)
        Traceback (most recent call last):
        File ".../unittest.py",  line 252, in debug
        getattr(self, self.__testMethodName)()
        File "testrunner-ex/sample3/sampletests_d.py",
        line 42, in test_post_mortem_failure1
        assert x == y
        AssertionError
        <BLANKLINE>
        ...AssertionError:
        <BLANKLINE>
        > testrunner-ex/sample3/sampletests_d.py(42)test_post_mortem_failure1()
        -> assert x == y
        (Pdb) p x
        1
        (Pdb) p y
        2
        (Pdb) c
        True
        
        Layers that can't be torn down
        ==============================
        
        A layer can have a tearDown method that raises NotImplementedError.
        If this is the case and there are no remaining tests to run, the test
        runner will just note that the tear down couldn't be done:
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> from zope.testing import testrunner
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test -ssample2 --tests-pattern sampletests_ntd$'.split()
        >>> testrunner.run_internal(defaults)
        Running sample2.sampletests_ntd.Layer tests:
        Set up sample2.sampletests_ntd.Layer in 0.000 seconds.
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Tearing down left over layers:
        Tear down sample2.sampletests_ntd.Layer ... not supported
        False
        
        If the tearDown method raises NotImplementedError and there are remaining
        layers to run, the test runner will restart itself as a new process,
        resuming tests where it left off:
        
        >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntd$']
        >>> testrunner.run_internal(defaults)
        Running sample1.sampletests_ntd.Layer tests:
        Set up sample1.sampletests_ntd.Layer in N.NNN seconds.
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Running sample2.sampletests_ntd.Layer tests:
        Tear down sample1.sampletests_ntd.Layer ... not supported
        Running in a subprocess.
        Set up sample2.sampletests_ntd.Layer in N.NNN seconds.
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down sample2.sampletests_ntd.Layer ... not supported
        Running sample3.sampletests_ntd.Layer tests:
        Running in a subprocess.
        Set up sample3.sampletests_ntd.Layer in N.NNN seconds.
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_error1 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error1
        raise TypeError("Can we see errors")
        TypeError: Can we see errors
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_error2 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error2
        raise TypeError("I hope so")
        TypeError: I hope so
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Failure in test test_fail1 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail1
        self.assertEqual(1, 2)
        AssertionError: 1 != 2
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Failure in test test_fail2 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail2
        self.assertEqual(1, 3)
        AssertionError: 1 != 3
        <BLANKLINE>
        Ran 6 tests with 2 failures and 2 errors in N.NNN seconds.
        Tear down sample3.sampletests_ntd.Layer ... not supported
        Total: 8 tests, 2 failures, 2 errors in N.NNN seconds.
        True
        
        in the example above, some of the tests run as a subprocess had errors
        and failures. They were displayed as usual and the failure and error
        statistice were updated as usual.
        
        Note that debugging doesn't work when running tests in a subprocess:
        
        >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntd$',
        ...             '-D', ]
        >>> testrunner.run_internal(defaults)
        Running sample1.sampletests_ntd.Layer tests:
        Set up sample1.sampletests_ntd.Layer in N.NNN seconds.
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Running sample2.sampletests_ntd.Layer tests:
        Tear down sample1.sampletests_ntd.Layer ... not supported
        Running in a subprocess.
        Set up sample2.sampletests_ntd.Layer in N.NNN seconds.
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tear down sample2.sampletests_ntd.Layer ... not supported
        Running sample3.sampletests_ntd.Layer tests:
        Running in a subprocess.
        Set up sample3.sampletests_ntd.Layer in N.NNN seconds.
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_error1 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error1
        raise TypeError("Can we see errors")
        TypeError: Can we see errors
        <BLANKLINE>
        <BLANKLINE>
        **********************************************************************
        Can't post-mortem debug when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_error2 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_error2
        raise TypeError("I hope so")
        TypeError: I hope so
        <BLANKLINE>
        <BLANKLINE>
        **********************************************************************
        Can't post-mortem debug when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_fail1 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail1
        self.assertEqual(1, 2)
        AssertionError: 1 != 2
        <BLANKLINE>
        <BLANKLINE>
        **********************************************************************
        Can't post-mortem debug when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        <BLANKLINE>
        <BLANKLINE>
        Error in test test_fail2 (sample3.sampletests_ntd.TestSomething)
        Traceback (most recent call last):
        testrunner-ex/sample3/sampletests_ntd.py", Line NNN, in test_fail2
        self.assertEqual(1, 3)
        AssertionError: 1 != 3
        <BLANKLINE>
        <BLANKLINE>
        **********************************************************************
        Can't post-mortem debug when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        Ran 6 tests with 0 failures and 4 errors in N.NNN seconds.
        Tear down sample3.sampletests_ntd.Layer ... not supported
        Total: 8 tests, 0 failures, 4 errors in N.NNN seconds.
        True
        
        Similarly, pdb.set_trace doesn't work when running tests in a layer
        that is run as a subprocess:
        
        >>> sys.argv = [testrunner_script, '--tests-pattern', 'sampletests_ntds']
        >>> testrunner.run_internal(defaults)
        Running sample1.sampletests_ntds.Layer tests:
        Set up sample1.sampletests_ntds.Layer in 0.000 seconds.
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Running sample2.sampletests_ntds.Layer tests:
        Tear down sample1.sampletests_ntds.Layer ... not supported
        Running in a subprocess.
        Set up sample2.sampletests_ntds.Layer in 0.000 seconds.
        --Return--
        > testrunner-ex/sample2/sampletests_ntds.py(37)test_something()->None
        -> import pdb; pdb.set_trace()
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > testrunner-ex/sample2/sampletests_ntds.py(40)test_something2()->None
        -> import pdb; pdb.set_trace()
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > testrunner-ex/sample2/sampletests_ntds.py(43)test_something3()->None
        -> import pdb; pdb.set_trace()
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > testrunner-ex/sample2/sampletests_ntds.py(46)test_something4()->None
        -> import pdb; pdb.set_trace()
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > testrunner-ex/sample2/sampletests_ntds.py(52)f()->None
        -> import pdb; pdb.set_trace()
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > doctest.py(351)set_trace()->None
        -> pdb.Pdb.set_trace(self)
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        --Return--
        > doctest.py(351)set_trace()->None
        -> pdb.Pdb.set_trace(self)
        (Pdb) c
        <BLANKLINE>
        **********************************************************************
        Can't use pdb.set_trace when running a layer as a subprocess!
        **********************************************************************
        <BLANKLINE>
        Ran 7 tests with 0 failures and 0 errors in 0.008 seconds.
        Tear down sample2.sampletests_ntds.Layer ... not supported
        Total: 8 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        If you want to use pdb from a test in a layer that is run as a
        subprocess, then rerun the test runner selecting *just* that layer so
        that it's not run as a subprocess.
        
        
        If a test is run in a subprocess and it generates output on stderr (as
        stderrtest does), the output is ignored (but it doesn't cause a SubprocessError
        like it once did).
        
        >>> from cStringIO import StringIO
        >>> real_stderr = sys.stderr
        >>> sys.stderr = StringIO()
        
        >>> sys.argv = [testrunner_script, '-s', 'sample2', '--tests-pattern',
        ...     '(sampletests_ntd$|stderrtest)']
        >>> testrunner.run_internal(defaults)
        Running sample2.sampletests_ntd.Layer tests:
        Set up sample2.sampletests_ntd.Layer in 0.000 seconds.
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Running sample2.stderrtest.Layer tests:
        Tear down sample2.sampletests_ntd.Layer ... not supported
        Running in a subprocess.
        Set up sample2.stderrtest.Layer in 0.000 seconds.
        Ran 1 tests with 0 failures and 0 errors in 0.002 seconds.
        Tear down sample2.stderrtest.Layer in 0.000 seconds.
        Total: 2 tests, 0 failures, 0 errors in 0.197 seconds.
        False
        
        >>> print sys.stderr.getvalue()
        A message on stderr.  Please ignore (expected in test output).
        
        >>> sys.stderr = real_stderr
        
        
        Code Coverage
        =============
        
        If the --coverage option is used, test coverage reports will be generated.  The
        directory name given as the parameter will be used to hold the reports.
        
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test --coverage=coverage_dir'.split()
        
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer1 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Ran 9 tests with 0 failures and 0 errors in 0.000 seconds.
        Running samplelayers.Layer11 tests:
        Set up samplelayers.Layer11 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.125 seconds.
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in 0.000 seconds.
        Set up samplelayers.Layer111 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.125 seconds.
        Running samplelayers.Layer112 tests:
        Tear down samplelayers.Layer111 in 0.000 seconds.
        Set up samplelayers.Layer112 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.125 seconds.
        Running samplelayers.Layer12 tests:
        Tear down samplelayers.Layer112 in 0.000 seconds.
        Tear down samplelayers.Layerx in 0.000 seconds.
        Tear down samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.140 seconds.
        Running samplelayers.Layer121 tests:
        Set up samplelayers.Layer121 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.125 seconds.
        Running samplelayers.Layer122 tests:
        Tear down samplelayers.Layer121 in 0.000 seconds.
        Set up samplelayers.Layer122 in 0.000 seconds.
        Ran 34 tests with 0 failures and 0 errors in 0.125 seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down samplelayers.Layer122 in 0.000 seconds.
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        Set up zope.testing.testrunner.layer.UnitTests in 0.000 seconds.
        Ran 192 tests with 0 failures and 0 errors in 0.687 seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in 0.000 seconds.
        lines   cov%   module   (path)
        ...
        48   100%   sampletests.test1   (testrunner-ex/sampletests/test1.py)
        74   100%   sampletests.test11   (testrunner-ex/sampletests/test11.py)
        74   100%   sampletests.test111   (testrunner-ex/sampletests/test111.py)
        76   100%   sampletests.test112   (testrunner-ex/sampletests/test112.py)
        74   100%   sampletests.test12   (testrunner-ex/sampletests/test12.py)
        74   100%   sampletests.test121   (testrunner-ex/sampletests/test121.py)
        74   100%   sampletests.test122   (testrunner-ex/sampletests/test122.py)
        48   100%   sampletests.test_one   (testrunner-ex/sampletests/test_one.py)
        112    95%   sampletestsf   (testrunner-ex/sampletestsf.py)
        Total: 405 tests, 0 failures, 0 errors in 0.630 seconds.
        False
        
        The directory specified with the --coverage option will have been created and
        will hold the coverage reports.
        
        >>> os.path.exists('coverage_dir')
        True
        >>> os.listdir('coverage_dir')
        [...]
        
        (We should clean up after ourselves.)
        
        >>> import shutil
        >>> shutil.rmtree('coverage_dir')
        
        
        Ignoring Tests
        --------------
        
        The ``trace`` module supports ignoring directories and modules based the test
        selection. Only directories selected for testing should report coverage. The
        test runner provides a custom implementation of the relevant API.
        
        The ``TestIgnore`` class, the class managing the ignoring, is initialized by
        passing the command line options. It uses the options to determine the
        directories that should be covered.
        
        >>> class FauxOptions(object):
        ...   package = None
        ...   test_path = [('/myproject/src/blah/foo', ''),
        ...                ('/myproject/src/blah/bar', '')]
        >>> from zope.testing.testrunner import coverage
        >>> from zope.testing.testrunner.find import test_dirs
        >>> ignore = coverage.TestIgnore(test_dirs(FauxOptions(), {}))
        >>> ignore._test_dirs
        ['/myproject/src/blah/foo/', '/myproject/src/blah/bar/']
        
        We can now ask whether a particular module should be ignored:
        
        >>> ignore.names('/myproject/src/blah/foo/baz.py', 'baz')
        False
        >>> ignore.names('/myproject/src/blah/bar/mine.py', 'mine')
        False
        >>> ignore.names('/myproject/src/blah/foo/__init__.py', 'foo')
        False
        >>> ignore.names('/myproject/src/blah/hello.py', 'hello')
        True
        
        When running the test runner, modules are sometimes created from text
        strings. Those should *always* be ignored:
        
        >>> ignore.names('/myproject/src/blah/hello.txt', '<string>')
        True
        
        To make this check fast, the class implements a cache. In an early
        implementation, the result was cached by the module name, which was a problem,
        since a lot of modules carry the same name (not the Python dotted name
        here!). So just because a module has the same name in an ignored and tested
        directory, does not mean it is always ignored:
        
        >>> ignore.names('/myproject/src/blah/module.py', 'module')
        True
        >>> ignore.names('/myproject/src/blah/foo/module.py', 'module')
        False
        
        Profiling
        =========
        The testrunner supports hotshot and cProfile profilers. Hotshot profiler
        support does not work with python2.6
        
        >>> import os.path, sys
        >>> profiler = '--profile=hotshot'
        >>> if sys.hexversion >= 0x02060000:
        ...     profiler = '--profile=cProfile'
        
        The testrunner includes the ability to profile the test execution with hotshot
        via the --profile option, if it a python <= 2.6
        
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> sys.path.append(directory_with_tests)
        
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = [testrunner_script, profiler]
        
        When the tests are run, we get profiling output.
        
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer1 tests:
        ...
        Running samplelayers.Layer11 tests:
        ...
        Running zope.testing.testrunner.layer.UnitTests tests:
        ...
        ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        ...
        Total: ... tests, 0 failures, 0 errors in ... seconds.
        False
        
        Profiling also works across layers.
        
        >>> sys.argv = [testrunner_script, '-ssample2', profiler,
        ...             '--tests-pattern', 'sampletests_ntd']
        >>> testrunner.run_internal(defaults)
        Running...
        Tear down ... not supported...
        ncalls  tottime  percall  cumtime  percall filename:lineno(function)...
        
        The testrunner creates temnporary files containing hotshot profiler
        data:
        
        >>> import glob
        >>> files = list(glob.glob('tests_profile.*.prof'))
        >>> files.sort()
        >>> files
        ['tests_profile.cZj2jt.prof', 'tests_profile.yHD-so.prof']
        
        It deletes these when rerun.  We'll delete these ourselves:
        
        >>> import os
        >>> for f in files:
        ...     os.unlink(f)
        
        Running Without Source Code
        ===========================
        
        The ``--usecompiled`` option allows running tests in a tree without .py
        source code, provided compiled .pyc or .pyo files exist (without
        ``--usecompiled``, .py files are necessary).
        
        We have a very simple directory tree, under ``usecompiled/``, to test
        this.  Because we're going to delete its .py files, we want to work
        in a copy of that:
        
        >>> import os.path, shutil, sys, tempfile
        >>> directory_with_tests = tempfile.mkdtemp()
        
        >>> NEWNAME = "unlikely_package_name"
        >>> src = os.path.join(this_directory, 'testrunner-ex', 'usecompiled')
        >>> os.path.isdir(src)
        True
        >>> dst = os.path.join(directory_with_tests, NEWNAME)
        >>> os.path.isdir(dst)
        False
        
        Have to use our own copying code, to avoid copying read-only SVN files that
        can't be deleted later.
        
        >>> n = len(src) + 1
        >>> for root, dirs, files in os.walk(src):
        ...     dirs[:] = [d for d in dirs if d == "package"] # prune cruft
        ...     os.mkdir(os.path.join(dst, root[n:]))
        ...     for f in files:
        ...         shutil.copy(os.path.join(root, f),
        ...                     os.path.join(dst, root[n:], f))
        
        Now run the tests in the copy:
        
        >>> from zope.testing import testrunner
        
        >>> mydefaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^compiletest$',
        ...     '--package', NEWNAME,
        ...     '-vv',
        ...     ]
        >>> sys.argv = ['test']
        >>> testrunner.run_internal(mydefaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test1 (unlikely_package_name.compiletest.Test)
        test2 (unlikely_package_name.compiletest.Test)
        test1 (unlikely_package_name.package.compiletest.Test)
        test2 (unlikely_package_name.package.compiletest.Test)
        Ran 4 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        If we delete the source files, it's normally a disaster:  the test runner
        doesn't believe any test files, or even packages, exist.  Note that we pass
        ``--keepbytecode`` this time, because otherwise the test runner would
        delete the compiled Python files too:
        
        >>> for root, dirs, files in os.walk(dst):
        ...    for f in files:
        ...        if f.endswith(".py"):
        ...            os.remove(os.path.join(root, f))
        >>> testrunner.run_internal(mydefaults, ["test", "--keepbytecode"])
        Running tests at level 1
        Total: 0 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        Finally, passing ``--usecompiled`` asks the test runner to treat .pyc
        and .pyo files as adequate replacements for .py files.  Note that the
        output is the same as when running with .py source above.  The absence
        of "removing stale bytecode ..." messages shows that ``--usecompiled``
        also implies ``--keepbytecode``:
        
        >>> testrunner.run_internal(mydefaults, ["test", "--usecompiled"])
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        test1 (unlikely_package_name.compiletest.Test)
        test2 (unlikely_package_name.compiletest.Test)
        test1 (unlikely_package_name.package.compiletest.Test)
        test2 (unlikely_package_name.package.compiletest.Test)
        Ran 4 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        False
        
        
        Remove the temporary directory:
        
        >>> shutil.rmtree(directory_with_tests)
        
        Repeating Tests
        ===============
        
        The --repeat option can be used to repeat tests some number of times.
        Repeating tests is useful to help make sure that tests clean up after
        themselves.
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> sys.argv = 'test --layer 112 --layer UnitTests --repeat 3'.split()
        >>> from zope.testing import testrunner
        >>> testrunner.run_internal(defaults)
        Running samplelayers.Layer112 tests:
        Set up samplelayers.Layerx in 0.000 seconds.
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer112 in 0.000 seconds.
        Iteration 1
        Ran 34 tests with 0 failures and 0 errors in 0.010 seconds.
        Iteration 2
        Ran 34 tests with 0 failures and 0 errors in 0.010 seconds.
        Iteration 3
        Ran 34 tests with 0 failures and 0 errors in 0.010 seconds.
        Running zope.testing.testrunner.layer.UnitTests tests:
        Tear down samplelayers.Layer112 in N.NNN seconds.
        Tear down samplelayers.Layerx in N.NNN seconds.
        Tear down samplelayers.Layer11 in N.NNN seconds.
        Tear down samplelayers.Layer1 in N.NNN seconds.
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Iteration 1
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Iteration 2
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Iteration 3
        Ran 192 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Total: 226 tests, 0 failures, 0 errors in N.NNN seconds.
        False
        
        The tests are repeated by layer.  Layers are set up and torn down only
        once.
        
        Garbage Collection Control
        ==========================
        
        When having problems that seem to be caused my memory-management
        errors, it can be helpful to adjust Python's cyclic garbage collector
        or to get garbage colection statistics.  The --gc option can be used
        for this purpose.
        
        If you think you are getting a test failure due to a garbage
        collection problem, you can try disabling garbage collection by
        using the --gc option with a value of zero.
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = ['--path', directory_with_tests]
        
        >>> from zope.testing import testrunner
        
        >>> sys.argv = 'test --tests-pattern ^gc0$ --gc 0 -vv'.split()
        >>> _ = testrunner.run_internal(defaults)
        Cyclic garbage collection is disabled.
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        make_sure_gc_is_disabled (gc0)
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        
        Alternatively, if you think you are having a garbage collection
        related problem, you can cause garbage collection to happen more often
        by providing a low threshold:
        
        >>> sys.argv = 'test --tests-pattern ^gc1$ --gc 1 -vv'.split()
        >>> _ = testrunner.run_internal(defaults)
        Cyclic garbage collection threshold set to: (1,)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        make_sure_gc_threshold_is_one (gc1)
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        You can specify up to 3 --gc options to set each of the 3 gc threshold
        values:
        
        
        >>> sys.argv = ('test --tests-pattern ^gcset$ --gc 701 --gc 11 --gc 9 -vv'
        ...             .split())
        >>> _ = testrunner.run_internal(defaults)
        Cyclic garbage collection threshold set to: (701, 11, 9)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        make_sure_gc_threshold_is_701_11_9 (gcset)
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        Specifying more than 3 --gc options is not allowed:
        
        
        >>> from StringIO import StringIO
        >>> out = StringIO()
        >>> stdout = sys.stdout
        >>> sys.stdout = out
        
        >>> sys.argv = ('test --tests-pattern ^gcset$ --gc 701 --gc 42 --gc 11 --gc 9 -vv'
        ...             .split())
        >>> _ = testrunner.run_internal(defaults)
        Traceback (most recent call last):
        ...
        SystemExit: 1
        
        >>> sys.stdout = stdout
        
        >>> print out.getvalue()
        Too many --gc options
        
        Garbage Collection Statistics
        -----------------------------
        
        You can enable gc debugging statistics using the --gc-options (-G)
        option.  You should provide names of one or more of the flags
        described in the library documentation for the gc module.
        
        The output statistics are written to standard error.
        
        >>> from StringIO import StringIO
        >>> err = StringIO()
        >>> stderr = sys.stderr
        >>> sys.stderr = err
        >>> sys.argv = ('test --tests-pattern ^gcstats$ -G DEBUG_STATS'
        ...             ' -G DEBUG_COLLECTABLE -vv'
        ...             .split())
        >>> _ = testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:
        Set up zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        Running:
        generate_some_gc_statistics (gcstats)
        Ran 1 tests with 0 failures and 0 errors in N.NNN seconds.
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        >>> sys.stderr = stderr
        
        >>> print err.getvalue()        # doctest: +ELLIPSIS
        gc: collecting generation ...
        
        Debugging Memory Leaks
        ======================
        
        The --report-refcounts (-r) option can be used with the --repeat (-N)
        option to detect and diagnose memory leaks.  To use this option, you
        must configure Python with the --with-pydebug option. (On Unix, pass
        this option to configure and then build Python.)
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     ]
        
        >>> from zope.testing import testrunner
        
        >>> sys.argv = 'test --layer Layer11$ --layer Layer12$ -N4 -r'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running samplelayers.Layer11 tests:
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer11 in 0.000 seconds.
        Iteration 1
        Ran 34 tests with 0 failures and 0 errors in 0.013 seconds.
        Iteration 2
        Ran 34 tests with 0 failures and 0 errors in 0.012 seconds.
        sys refcount=100401   change=0
        Iteration 3
        Ran 34 tests with 0 failures and 0 errors in 0.012 seconds.
        sys refcount=100401   change=0
        Iteration 4
        Ran 34 tests with 0 failures and 0 errors in 0.013 seconds.
        sys refcount=100401   change=0
        Running samplelayers.Layer12 tests:
        Tear down samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer12 in 0.000 seconds.
        Iteration 1
        Ran 34 tests with 0 failures and 0 errors in 0.013 seconds.
        Iteration 2
        Ran 34 tests with 0 failures and 0 errors in 0.012 seconds.
        sys refcount=100411   change=0
        Iteration 3
        Ran 34 tests with 0 failures and 0 errors in 0.012 seconds.
        sys refcount=100411   change=0
        Iteration 4
        Ran 34 tests with 0 failures and 0 errors in 0.012 seconds.
        sys refcount=100411   change=0
        Tearing down left over layers:
        Tear down samplelayers.Layer12 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        Total: 68 tests, 0 failures, 0 errors in N.NNN seconds.
        
        Each layer is repeated the requested number of times.  For each
        iteration after the first, the system refcount and change in system
        refcount is shown. The system refcount is the total of all refcount in
        the system.  When a refcount on any object is changed, the system
        refcount is changed by the same amount.  Tests that don't leak show
        zero changes in systen refcount.
        
        Let's look at an example test that leaks:
        
        >>> sys.argv = 'test --tests-pattern leak -N4 -r'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running zope.testing.testrunner.layer.UnitTests tests:...
        Iteration 1
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Iteration 2
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sys refcount=92506    change=12
        Iteration 3
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sys refcount=92513    change=12
        Iteration 4
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sys refcount=92520    change=12
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        Here we see that the system refcount is increating.  If we specify a
        verbosity greater than one, we can get details broken out by object
        type (or class):
        
        >>> sys.argv = 'test --tests-pattern leak -N5 -r -v'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running tests at level 1
        Running zope.testing.testrunner.layer.UnitTests tests:...
        Iteration 1
        Running:
        .
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Iteration 2
        Running:
        .
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sum detail refcount=95832    sys refcount=105668   change=16
        Leak details, changes in instances and refcounts by type/class:
        type/class                                               insts   refs
        -------------------------------------------------------  -----   ----
        classobj                                                     0      1
        dict                                                         2      2
        float                                                        1      1
        int                                                          2      2
        leak.ClassicLeakable                                         1      1
        leak.Leakable                                                1      1
        str                                                          0      4
        tuple                                                        1      1
        type                                                         0      3
        -------------------------------------------------------  -----   ----
        total                                                        8     16
        Iteration 3
        Running:
        .
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sum detail refcount=95844    sys refcount=105680   change=12
        Leak details, changes in instances and refcounts by type/class:
        type/class                                               insts   refs
        -------------------------------------------------------  -----   ----
        classobj                                                     0      1
        dict                                                         2      2
        float                                                        1      1
        int                                                         -1      0
        leak.ClassicLeakable                                         1      1
        leak.Leakable                                                1      1
        str                                                          0      4
        tuple                                                        1      1
        type                                                         0      1
        -------------------------------------------------------  -----   ----
        total                                                        5     12
        Iteration 4
        Running:
        .
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sum detail refcount=95856    sys refcount=105692   change=12
        Leak details, changes in instances and refcounts by type/class:
        type/class                                               insts   refs
        -------------------------------------------------------  -----   ----
        classobj                                                     0      1
        dict                                                         2      2
        float                                                        1      1
        leak.ClassicLeakable                                         1      1
        leak.Leakable                                                1      1
        str                                                          0      4
        tuple                                                        1      1
        type                                                         0      1
        -------------------------------------------------------  -----   ----
        total                                                        6     12
        Iteration 5
        Running:
        .
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        sum detail refcount=95868    sys refcount=105704   change=12
        Leak details, changes in instances and refcounts by type/class:
        type/class                                               insts   refs
        -------------------------------------------------------  -----   ----
        classobj                                                     0      1
        dict                                                         2      2
        float                                                        1      1
        leak.ClassicLeakable                                         1      1
        leak.Leakable                                                1      1
        str                                                          0      4
        tuple                                                        1      1
        type                                                         0      1
        -------------------------------------------------------  -----   ----
        total                                                        6     12
        Tearing down left over layers:
        Tear down zope.testing.testrunner.layer.UnitTests in N.NNN seconds.
        
        It is instructive to analyze the results in some detail.  The test
        being run was designed to intentionally leak:
        
        class ClassicLeakable:
        def __init__(self):
        self.x = 'x'
        
        class Leakable(object):
        def __init__(self):
        self.x = 'x'
        
        leaked = []
        
        class TestSomething(unittest.TestCase):
        
        def testleak(self):
        leaked.append((ClassicLeakable(), Leakable(), time.time()))
        
        Let's go through this by type.
        
        float, leak.ClassicLeakable, leak.Leakable, and tuple
        We leak one of these every time.  This is to be expected because
        we are adding one of these to the list every time.
        
        str
        We don't leak any instances, but we leak 4 references. These are
        due to the instance attributes avd values.
        
        dict
        We leak 2 of these, one for each ClassicLeakable and Leakable
        instance.
        
        classobj
        We increase the number of classobj instance references by one each
        time because each ClassicLeakable instance has a reference to its
        class.  This instances increases the references in it's class,
        which increases the total number of references to classic classes
        (clasobj instances).
        
        type
        For most interations, we increase the number of type references by
        one for the same reason we increase the number of clasobj
        references by one.  The increase of the number of type references
        by 3 in the second iteration is puzzling, but illustrates that
        this sort of data is often puzzling.
        
        int
        The change in the number of int instances and references in this
        example is a side effect of the statistics being gathered.  Lots
        of integers are created to keep the memory statistics used here.
        
        The summary statistics include the sum of the detail refcounts.  (Note
        that this sum is less than the system refcount.  This is because the
        detailed analysis doesn't inspect every object. Not all objects in the
        system are returned by sys.getobjects.)
        
        Knitting in extra package directories
        =====================================
        
        Python packages have __path__ variables that can be manipulated to add
        extra directories cntaining software used in the packages.  The
        testrunner needs to be given extra information about this sort of
        situation.
        
        Let's look at an example.  The testrunner-ex-knit-lib directory
        is a directory that we want to add to the Python path, but that we
        don't want to search for tests.  It has a sample4 package and a
        products subpackage.  The products subpackage adds the
        testrunner-ex-knit-products to it's __path__.  We want to run tests
        from the testrunner-ex-knit-products directory.  When we import these
        tests, we need to import them from the sample4.products package.  We
        can't use the --path option to name testrunner-ex-knit-products.
        It isn't enough to add the containing directory to the test path
        because then we wouldn't be able to determine the package name
        properly.  We might be able to use the --package option to run the
        tests from the sample4/products package, but we want to run tests in
        testrunner-ex that aren't in this package.
        
        We can use the --package-path option in this case.  The --package-path
        option is like the --test-path option in that it defines a path to be
        searched for tests without affecting the python path.  It differs in
        that it supplied a package name that is added a profex when importing
        any modules found.  The --package-path option takes *two* arguments, a
        package name and file path.
        
        >>> import os.path, sys
        >>> directory_with_tests = os.path.join(this_directory, 'testrunner-ex')
        >>> sys.path.append(os.path.join(this_directory, 'testrunner-ex-pp-lib'))
        >>> defaults = [
        ...     '--path', directory_with_tests,
        ...     '--tests-pattern', '^sampletestsf?$',
        ...     '--package-path',
        ...     os.path.join(this_directory, 'testrunner-ex-pp-products'),
        ...     'sample4.products',
        ...     ]
        
        >>> from zope.testing import testrunner
        
        >>> sys.argv = 'test --layer Layer111 -vv'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in 0.000 seconds.
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer111 in 0.000 seconds.
        Running:
        test_x1 (sample1.sampletests.test111.TestA)
        test_y0 (sample1.sampletests.test111.TestA)
        ...
        test_y0 (sampletests.test111)
        test_z1 (sampletests.test111)
        testrunner-ex/sampletests/../sampletestsl.txt
        test_extra_test_in_products (sample4.products.sampletests.Test)
        test_another_test_in_products (sample4.products.more.sampletests.Test)
        Ran 36 tests with 0 failures and 0 errors in 0.008 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer111 in 0.000 seconds.
        Tear down samplelayers.Layerx in 0.000 seconds.
        Tear down samplelayers.Layer11 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        
        In the example, the last test, test_extra_test_in_products, came from
        the products directory.  As usual, we can select the knit-in packages
        or individual packages within knit-in packages:
        
        >>> sys.argv = 'test --package sample4.products -vv'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in 0.000 seconds.
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer111 in 0.000 seconds.
        Running:
        test_extra_test_in_products (sample4.products.sampletests.Test)
        test_another_test_in_products (sample4.products.more.sampletests.Test)
        Ran 2 tests with 0 failures and 0 errors in 0.000 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer111 in 0.000 seconds.
        Tear down samplelayers.Layerx in 0.000 seconds.
        Tear down samplelayers.Layer11 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        
        >>> sys.argv = 'test --package sample4.products.more -vv'.split()
        >>> _ = testrunner.run_internal(defaults)
        Running tests at level 1
        Running samplelayers.Layer111 tests:
        Set up samplelayers.Layerx in 0.000 seconds.
        Set up samplelayers.Layer1 in 0.000 seconds.
        Set up samplelayers.Layer11 in 0.000 seconds.
        Set up samplelayers.Layer111 in 0.000 seconds.
        Running:
        test_another_test_in_products (sample4.products.more.sampletests.Test)
        Ran 1 tests with 0 failures and 0 errors in 0.000 seconds.
        Tearing down left over layers:
        Tear down samplelayers.Layer111 in 0.000 seconds.
        Tear down samplelayers.Layerx in 0.000 seconds.
        Tear down samplelayers.Layer11 in 0.000 seconds.
        Tear down samplelayers.Layer1 in 0.000 seconds.
        
        Parsing HTML Forms
        ==================
        
        Sometimes in functional tests, information from a generated form must
        be extracted in order to re-submit it as part of a subsequent request.
        The `zope.testing.formparser` module can be used for this purpose.
        
        The scanner is implemented using the `FormParser` class.  The
        constructor arguments are the page data containing the form and
        (optionally) the URL from which the page was retrieved:
        
        >>> import zope.testing.formparser
        
        >>> page_text = '''\
        ... <html><body>
        ...   <form name="form1" action="/cgi-bin/foobar.py" method="POST">
        ...     <input type="hidden" name="f1" value="today" />
        ...     <input type="submit" name="do-it-now" value="Go for it!" />
        ...     <input type="IMAGE" name="not-really" value="Don't."
        ...            src="dont.png" />
        ...     <select name="pick-two" size="3" multiple>
        ...       <option value="one" selected>First</option>
        ...       <option value="two" label="Second">Another</option>
        ...       <optgroup>
        ...         <option value="three">Third</option>
        ...         <option selected="selected">Fourth</option>
        ...       </optgroup>
        ...     </select>
        ...   </form>
        ...
        ...   Just for fun, a second form, after specifying a base:
        ...   <base href="http://www.example.com/base/" />
        ...   <form action = 'sproing/sprung.html' enctype="multipart/form">
        ...     <textarea name="sometext" rows="5">Some text.</textarea>
        ...     <input type="Image" name="action" value="Do something."
        ...            src="else.png" />
        ...     <input type="text" value="" name="multi" size="2" />
        ...     <input type="text" value="" name="multi" size="3" />
        ...   </form>
        ... </body></html>
        ... '''
        
        >>> parser = zope.testing.formparser.FormParser(page_text)
        >>> forms = parser.parse()
        
        >>> len(forms)
        2
        >>> forms.form1 is forms[0]
        True
        >>> forms.form1 is forms[1]
        False
        
        More often, the `parse()` convenience function is all that's needed:
        
        >>> forms = zope.testing.formparser.parse(
        ...     page_text, "http://cgi.example.com/somewhere/form.html")
        
        >>> len(forms)
        2
        >>> forms.form1 is forms[0]
        True
        >>> forms.form1 is forms[1]
        False
        
        Once we have the form we're interested in, we can check form
        attributes and individual field values:
        
        >>> form = forms.form1
        >>> form.enctype
        'application/x-www-form-urlencoded'
        >>> form.method
        'post'
        
        >>> keys = form.keys()
        >>> keys.sort()
        >>> keys
        ['do-it-now', 'f1', 'not-really', 'pick-two']
        
        >>> not_really = form["not-really"]
        >>> not_really.type
        'image'
        >>> not_really.value
        "Don't."
        >>> not_really.readonly
        False
        >>> not_really.disabled
        False
        
        Note that relative URLs are converted to absolute URLs based on the
        ``<base>`` element (if present) or using the base passed in to the
        constructor.
        
        >>> form.action
        'http://cgi.example.com/cgi-bin/foobar.py'
        >>> not_really.src
        'http://cgi.example.com/somewhere/dont.png'
        
        >>> forms[1].action
        'http://www.example.com/base/sproing/sprung.html'
        >>> forms[1]["action"].src
        'http://www.example.com/base/else.png'
        
        Fields which are repeated are reported as lists of objects that
        represent each instance of the field::
        
        >>> field = forms[1]["multi"]
        >>> type(field)
        <type 'list'>
        >>> [o.value for o in field]
        ['', '']
        >>> [o.size for o in field]
        [2, 3]
        
        The ``<textarea>`` element provides some additional attributes:
        
        >>> ta = forms[1]["sometext"]
        >>> print ta.rows
        5
        >>> print ta.cols
        None
        >>> ta.value
        'Some text.'
        
        The ``<select>`` element provides access to the options as well:
        
        >>> select = form["pick-two"]
        >>> select.multiple
        True
        >>> select.size
        3
        >>> select.type
        'select'
        >>> select.value
        ['one', 'Fourth']
        
        >>> options = select.options
        >>> len(options)
        4
        >>> [opt.label for opt in options]
        ['First', 'Second', 'Third', 'Fourth']
        >>> [opt.value for opt in options]
        ['one', 'two', 'three', 'Fourth']
        
        Stack-based test doctest setUp and tearDown
        ============================================
        
        Writing doctest setUp and tearDown functions can be a bit tedious,
        especially when setUp/tearDown functions are combined.
        
        the zope.testing.setupstack module provides a small framework for
        automating test tear down.  It provides a generic setUp function that
        sets up a stack. Normal test setUp functions call this function to set
        up the stack and then use the register function to register tear-down
        functions.
        
        To see how this works we'll create a faux test:
        
        >>> class Test:
        ...     def __init__(self):
        ...         self.globs = {}
        >>> test = Test()
        
        We'll register some tearDown functions that just print something:
        
        >>> import sys
        >>> import zope.testing.setupstack
        >>> zope.testing.setupstack.register(
        ...     test, lambda : sys.stdout.write('td 1\n'))
        >>> zope.testing.setupstack.register(
        ...     test, lambda : sys.stdout.write('td 2\n'))
        
        Now, when we call the tearDown function:
        
        >>> zope.testing.setupstack.tearDown(test)
        td 2
        td 1
        
        The registered tearDown functions are run. Note that they are run in
        the reverse order that they were registered.
        
        
        Extra positional arguments can be passed to register:
        
        >>> zope.testing.setupstack.register(
        ...    test, lambda x, y, z: sys.stdout.write('%s %s %s\n' % (x, y, z)),
        ...    1, 2, z=9)
        >>> zope.testing.setupstack.tearDown(test)
        1 2 9
        
        
        Temporary Test Directory
        ------------------------
        
        Often, tests create files as they demonstrate functionality.  They
        need to arrange for the removeal of these files when the test is
        cleaned up.
        
        The setUpDirectory function automates this.  We'll get the current
        directory first:
        
        >>> import os
        >>> here = os.getcwd()
        
        We'll also create a new test:
        
        >>> test = Test()
        
        Now we'll call the setUpDirectory function:
        
        >>> zope.testing.setupstack.setUpDirectory(test)
        
        We don't have to call zope.testing.setupstack.setUp, because
        setUpDirectory calls it for us.
        
        Now the current working directory has changed:
        
        >>> here == os.getcwd()
        False
        
        We can create files to out heart's content:
        
        >>> open('Data.fs', 'w').write('xxx')
        >>> os.path.exists('Data.fs')
        True
        
        We'll make the file read-only. This can cause problems on Windows, but
        setupstack takes care of that by making files writable before trying
        to remove them.
        
        >>> import stat
        >>> os.chmod('Data.fs', stat.S_IREAD)
        
        When tearDown is called:
        
        >>> zope.testing.setupstack.tearDown(test)
        
        We'll be back where we started:
        
        >>> here == os.getcwd()
        True
        
        and the files we created will be gone (along with the temporary
        directory that was created:
        
        >>> os.path.exists('Data.fs')
        False
        
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Environment :: Console
Classifier: Framework :: Zope3
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: Zope Public License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python :: 2.4
Classifier: Programming Language :: Python :: 2.5
Classifier: Programming Language :: Python :: 2.6
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Software Development :: Testing