# Copyright (c) 2008-2012 testtools developers. See LICENSE for details.

"""Test TestResults and related things."""

__metaclass__ = type

import codecs
import datetime
import doctest
from itertools import chain, combinations
import os
import shutil
import sys
import tempfile
import threading
from unittest import TestSuite
import warnings

from extras import safe_hasattr, try_imports

Queue = try_imports(['Queue.Queue', 'queue.Queue'])

from testtools import (
    CopyStreamResult,
    ExtendedToOriginalDecorator,
    ExtendedToStreamDecorator,
    MultiTestResult,
    PlaceHolder,
    StreamFailFast,
    StreamResult,
    StreamResultRouter,
    StreamSummary,
    StreamTagger,
    StreamToDict,
    StreamToExtendedDecorator,
    StreamToQueue,
    Tagger,
    TestCase,
    TestControl,
    TestResult,
    TestResultDecorator,
    TestByTestResult,
    TextTestResult,
    ThreadsafeForwardingResult,
    TimestampingStreamResult,
    testresult,
    )
from testtools.compat import (
    _b,
    _get_exception_encoding,
    _r,
    _u,
    advance_iterator,
    str_is_unicode,
    StringIO,
    )
from testtools.content import (
    Content,
    content_from_stream,
    text_content,
    TracebackContent,
    )
from testtools.content_type import ContentType, UTF8_TEXT
from testtools.matchers import (
    AllMatch,
    Contains,
    DocTestMatches,
    Equals,
    HasLength,
    MatchesAny,
    MatchesException,
    Raises,
    )
from testtools.tests.helpers import (
    an_exc_info,
    FullStackRunTest,
    LoggingResult,
    run_with_stack_hidden,
    )
from testtools.testresult.doubles import (
    Python26TestResult,
    Python27TestResult,
    ExtendedTestResult,
    StreamResult as LoggingStreamResult,
    )
from testtools.testresult.real import (
    _details_to_str,
    _merge_tags,
    utc,
    )


def make_erroring_test():
    class Test(TestCase):
        def error(self):
            1/0
    return Test("error")


def make_failing_test():
    class Test(TestCase):
        def failed(self):
            self.fail("yo!")
    return Test("failed")


def make_mismatching_test():
    class Test(TestCase):
        def mismatch(self):
            self.assertEqual(1, 2)
    return Test("mismatch")


def make_unexpectedly_successful_test():
    class Test(TestCase):
        def succeeded(self):
            self.expectFailure("yo!", lambda: None)
    return Test("succeeded")


def make_test():
    class Test(TestCase):
        def test(self):
            pass
    return Test("test")


def make_exception_info(exceptionFactory, *args, **kwargs):
    try:
        raise exceptionFactory(*args, **kwargs)
    except:
        return sys.exc_info()


class Python26Contract(object):

    def test_fresh_result_is_successful(self):
        # A result is considered successful before any tests are run.
        result = self.makeResult()
        self.assertTrue(result.wasSuccessful())

    def test_addError_is_failure(self):
        # addError fails the test run.
        result = self.makeResult()
        result.startTest(self)
        result.addError(self, an_exc_info)
        result.stopTest(self)
        self.assertFalse(result.wasSuccessful())

    def test_addFailure_is_failure(self):
        # addFailure fails the test run.
        result = self.makeResult()
        result.startTest(self)
        result.addFailure(self, an_exc_info)
        result.stopTest(self)
        self.assertFalse(result.wasSuccessful())

    def test_addSuccess_is_success(self):
        # addSuccess does not fail the test run.
        result = self.makeResult()
        result.startTest(self)
        result.addSuccess(self)
        result.stopTest(self)
        self.assertTrue(result.wasSuccessful())

    def test_stop_sets_shouldStop(self):
        result = self.makeResult()
        result.stop()
        self.assertTrue(result.shouldStop)


class Python27Contract(Python26Contract):

    def test_addExpectedFailure(self):
        # Calling addExpectedFailure(test, exc_info) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addExpectedFailure(self, an_exc_info)

    def test_addExpectedFailure_is_success(self):
        # addExpectedFailure does not fail the test run.
        result = self.makeResult()
        result.startTest(self)
        result.addExpectedFailure(self, an_exc_info)
        result.stopTest(self)
        self.assertTrue(result.wasSuccessful())

    def test_addSkipped(self):
        # Calling addSkip(test, reason) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addSkip(self, _u("Skipped for some reason"))

    def test_addSkip_is_success(self):
        # addSkip does not fail the test run.
        result = self.makeResult()
        result.startTest(self)
        result.addSkip(self, _u("Skipped for some reason"))
        result.stopTest(self)
        self.assertTrue(result.wasSuccessful())

    def test_addUnexpectedSuccess(self):
        # Calling addUnexpectedSuccess(test) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addUnexpectedSuccess(self)

    def test_addUnexpectedSuccess_was_successful(self):
        # addUnexpectedSuccess does not fail the test run in Python 2.7.
        result = self.makeResult()
        result.startTest(self)
        result.addUnexpectedSuccess(self)
        result.stopTest(self)
        self.assertTrue(result.wasSuccessful())

    def test_startStopTestRun(self):
        # Calling startTestRun completes ok.
        result = self.makeResult()
        result.startTestRun()
        result.stopTestRun()

    def test_failfast(self):
        result = self.makeResult()
        result.failfast = True
        class Failing(TestCase):
            def test_a(self):
                self.fail('a')
            def test_b(self):
                self.fail('b')
        TestSuite([Failing('test_a'), Failing('test_b')]).run(result)
        self.assertEqual(1, result.testsRun)


class TagsContract(Python27Contract):
    """Tests to ensure correct tagging behaviour.

    See the subunit docs for guidelines on how this is supposed to work.
    """

    def test_no_tags_by_default(self):
        # Results initially have no tags.
        result = self.makeResult()
        result.startTestRun()
        self.assertEqual(frozenset(), result.current_tags)

    def test_adding_tags(self):
        # Tags are added using 'tags' and thus become visible in
        # 'current_tags'.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        self.assertEqual(set(['foo']), result.current_tags)

    def test_removing_tags(self):
        # Tags are removed using 'tags'.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.tags(set(), set(['foo']))
        self.assertEqual(set(), result.current_tags)

    def test_startTestRun_resets_tags(self):
        # startTestRun makes a new test run, and thus clears all the tags.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.startTestRun()
        self.assertEqual(set(), result.current_tags)

    def test_add_tags_within_test(self):
        # Tags can be added after a test has run.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.startTest(self)
        result.tags(set(['bar']), set())
        self.assertEqual(set(['foo', 'bar']), result.current_tags)

    def test_tags_added_in_test_are_reverted(self):
        # Tags added during a test run are then reverted once that test has
        # finished.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.startTest(self)
        result.tags(set(['bar']), set())
        result.addSuccess(self)
        result.stopTest(self)
        self.assertEqual(set(['foo']), result.current_tags)

    def test_tags_removed_in_test(self):
        # Tags can be removed during tests.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.startTest(self)
        result.tags(set(), set(['foo']))
        self.assertEqual(set(), result.current_tags)

    def test_tags_removed_in_test_are_restored(self):
        # Tags removed during tests are restored once that test has finished.
        result = self.makeResult()
        result.startTestRun()
        result.tags(set(['foo']), set())
        result.startTest(self)
        result.tags(set(), set(['foo']))
        result.addSuccess(self)
        result.stopTest(self)
        self.assertEqual(set(['foo']), result.current_tags)


class DetailsContract(TagsContract):
    """Tests for the details API of TestResults."""

    def test_addExpectedFailure_details(self):
        # Calling addExpectedFailure(test, details=xxx) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addExpectedFailure(self, details={})

    def test_addError_details(self):
        # Calling addError(test, details=xxx) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addError(self, details={})

    def test_addFailure_details(self):
        # Calling addFailure(test, details=xxx) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addFailure(self, details={})

    def test_addSkipped_details(self):
        # Calling addSkip(test, reason) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addSkip(self, details={})

    def test_addUnexpectedSuccess_details(self):
        # Calling addUnexpectedSuccess(test) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addUnexpectedSuccess(self, details={})

    def test_addSuccess_details(self):
        # Calling addSuccess(test) completes ok.
        result = self.makeResult()
        result.startTest(self)
        result.addSuccess(self, details={})


class FallbackContract(DetailsContract):
    """When we fallback we take our policy choice to map calls.

    For instance, we map unexpectedSuccess to an error code, not to success.
    """

    def test_addUnexpectedSuccess_was_successful(self):
        # addUnexpectedSuccess fails test run in testtools.
        result = self.makeResult()
        result.startTest(self)
        result.addUnexpectedSuccess(self)
        result.stopTest(self)
        self.assertFalse(result.wasSuccessful())


class StartTestRunContract(FallbackContract):
    """Defines the contract for testtools policy choices.

    That is things which are not simply extensions to unittest but choices we
    have made differently.
    """

    def test_startTestRun_resets_unexpected_success(self):
        result = self.makeResult()
        result.startTest(self)
        result.addUnexpectedSuccess(self)
        result.stopTest(self)
        result.startTestRun()
        self.assertTrue(result.wasSuccessful())

    def test_startTestRun_resets_failure(self):
        result = self.makeResult()
        result.startTest(self)
        result.addFailure(self, an_exc_info)
        result.stopTest(self)
        result.startTestRun()
        self.assertTrue(result.wasSuccessful())

    def test_startTestRun_resets_errors(self):
        result = self.makeResult()
        result.startTest(self)
        result.addError(self, an_exc_info)
        result.stopTest(self)
        result.startTestRun()
        self.assertTrue(result.wasSuccessful())


class TestTestResultContract(TestCase, StartTestRunContract):

    run_test_with = FullStackRunTest

    def makeResult(self):
        return TestResult()


class TestMultiTestResultContract(TestCase, StartTestRunContract):

    run_test_with = FullStackRunTest

    def makeResult(self):
        return MultiTestResult(TestResult(), TestResult())


class TestTextTestResultContract(TestCase, StartTestRunContract):

    run_test_with = FullStackRunTest

    def makeResult(self):
        return TextTestResult(StringIO())


class TestThreadSafeForwardingResultContract(TestCase, StartTestRunContract):

    run_test_with = FullStackRunTest

    def makeResult(self):
        result_semaphore = threading.Semaphore(1)
        target = TestResult()
        return ThreadsafeForwardingResult(target, result_semaphore)


class TestExtendedTestResultContract(TestCase, StartTestRunContract):

    def makeResult(self):
        return ExtendedTestResult()


class TestPython26TestResultContract(TestCase, Python26Contract):

    def makeResult(self):
        return Python26TestResult()


class TestAdaptedPython26TestResultContract(TestCase, FallbackContract):

    def makeResult(self):
        return ExtendedToOriginalDecorator(Python26TestResult())


class TestPython27TestResultContract(TestCase, Python27Contract):

    def makeResult(self):
        return Python27TestResult()


class TestAdaptedPython27TestResultContract(TestCase, DetailsContract):

    def makeResult(self):
        return ExtendedToOriginalDecorator(Python27TestResult())


class TestAdaptedStreamResult(TestCase, DetailsContract):

    def makeResult(self):
        return ExtendedToStreamDecorator(StreamResult())


class TestTestResultDecoratorContract(TestCase, StartTestRunContract):

    run_test_with = FullStackRunTest

    def makeResult(self):
        return TestResultDecorator(TestResult())


# DetailsContract because ExtendedToStreamDecorator follows Python for
# uxsuccess handling.
class TestStreamToExtendedContract(TestCase, DetailsContract):

    def makeResult(self):
        return ExtendedToStreamDecorator(
            StreamToExtendedDecorator(ExtendedTestResult()))


class TestStreamResultContract(object):

    def _make_result(self):
        raise NotImplementedError(self._make_result)

    def test_startTestRun(self):
        result = self._make_result()
        result.startTestRun()
        result.stopTestRun()

    def test_files(self):
        # Test parameter combinations when files are being emitted.
        result = self._make_result()
        result.startTestRun()
        self.addCleanup(result.stopTestRun)
        now = datetime.datetime.now(utc)
        inputs = list(dict(
            eof=True,
            mime_type="text/plain",
            route_code=_u("1234"),
            test_id=_u("foo"),
            timestamp=now,
            ).items())
        param_dicts = self._power_set(inputs)
        for kwargs in param_dicts:
            result.status(file_name=_u("foo"), file_bytes=_b(""), **kwargs)
            result.status(file_name=_u("foo"), file_bytes=_b("bar"), **kwargs)

    def test_test_status(self):
        # Tests non-file attachment parameter combinations.
        result = self._make_result()
        result.startTestRun()
        self.addCleanup(result.stopTestRun)
        now = datetime.datetime.now(utc)
        args = [[_u("foo"), s] for s in ['exists', 'inprogress', 'xfail',
            'uxsuccess', 'success', 'fail', 'skip']]
        inputs = list(dict(
            runnable=False,
            test_tags=set(['quux']),
            route_code=_u("1234"),
            timestamp=now,
            ).items())
        param_dicts = self._power_set(inputs)
        for kwargs in param_dicts:
            for arg in args:
                result.status(test_id=arg[0], test_status=arg[1], **kwargs)

    def _power_set(self, iterable):
        "powerset([1,2,3]) --> () (1,) (2,) (3,) (1,2) (1,3) (2,3) (1,2,3)"
        s = list(iterable)
        param_dicts = []
        for ss in chain.from_iterable(combinations(s, r) for r in range(len(s)+1)):
            param_dicts.append(dict(ss))
        return param_dicts


class TestBaseStreamResultContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamResult()


class TestCopyStreamResultContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return CopyStreamResult([StreamResult(), StreamResult()])


class TestDoubleStreamResultContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return LoggingStreamResult()


class TestExtendedToStreamDecoratorContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return ExtendedToStreamDecorator(StreamResult())


class TestStreamSummaryResultContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamSummary()


class TestStreamTaggerContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamTagger([StreamResult()], add=set(), discard=set())


class TestStreamToDictContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamToDict(lambda x:None)


class TestStreamToExtendedDecoratorContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamToExtendedDecorator(ExtendedTestResult())


class TestStreamToQueueContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        queue = Queue()
        return StreamToQueue(queue, "foo")


class TestStreamFailFastContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamFailFast(lambda:None)


class TestStreamResultRouterContract(TestCase, TestStreamResultContract):

    def _make_result(self):
        return StreamResultRouter(StreamResult())


class TestDoubleStreamResultEvents(TestCase):

    def test_startTestRun(self):
        result = LoggingStreamResult()
        result.startTestRun()
        self.assertEqual([('startTestRun',)], result._events)

    def test_stopTestRun(self):
        result = LoggingStreamResult()
        result.startTestRun()
        result.stopTestRun()
        self.assertEqual([('startTestRun',), ('stopTestRun',)], result._events)

    def test_file(self):
        result = LoggingStreamResult()
        result.startTestRun()
        now = datetime.datetime.now(utc)
        result.status(file_name="foo", file_bytes="bar", eof=True, mime_type="text/json",
            test_id="id", route_code='abc', timestamp=now)
        self.assertEqual(
            [('startTestRun',),
             ('status', 'id', None, None, True, 'foo', 'bar', True, 'text/json', 'abc', now)],
            result._events)

    def test_status(self):
        result = LoggingStreamResult()
        result.startTestRun()
        now = datetime.datetime.now(utc)
        result.status("foo", "success", test_tags=set(['tag']),
            runnable=False, route_code='abc', timestamp=now)
        self.assertEqual(
            [('startTestRun',),
             ('status', 'foo', 'success', set(['tag']), False, None, None, False, None, 'abc', now)],
            result._events)


class TestCopyStreamResultCopies(TestCase):

    def setUp(self):
        super(TestCopyStreamResultCopies, self).setUp()
        self.target1 = LoggingStreamResult()
        self.target2 = LoggingStreamResult()
        self.targets = [self.target1._events, self.target2._events]
        self.result = CopyStreamResult([self.target1, self.target2])

    def test_startTestRun(self):
        self.result.startTestRun()
        self.assertThat(self.targets, AllMatch(Equals([('startTestRun',)])))

    def test_stopTestRun(self):
        self.result.startTestRun()
        self.result.stopTestRun()
        self.assertThat(self.targets,
            AllMatch(Equals([('startTestRun',), ('stopTestRun',)])))

    def test_status(self):
        self.result.startTestRun()
        now = datetime.datetime.now(utc)
        self.result.status("foo", "success", test_tags=set(['tag']),
            runnable=False, file_name="foo", file_bytes=b'bar', eof=True,
            mime_type="text/json", route_code='abc', timestamp=now)
        self.assertThat(self.targets,
            AllMatch(Equals([('startTestRun',),
                ('status', 'foo', 'success', set(['tag']), False, "foo",
                 b'bar', True, "text/json", 'abc', now)
                ])))


class TestStreamTagger(TestCase):

    def test_adding(self):
        log = LoggingStreamResult()
        result = StreamTagger([log], add=['foo'])
        result.startTestRun()
        result.status()
        result.status(test_tags=set(['bar']))
        result.status(test_tags=None)
        result.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('status', None, None, set(['foo']), True, None, None, False, None, None, None),
            ('status', None, None, set(['foo', 'bar']), True, None, None, False, None, None, None),
            ('status', None, None, set(['foo']), True, None, None, False, None, None, None),
            ('stopTestRun',),
            ], log._events)

    def test_discarding(self):
        log = LoggingStreamResult()
        result = StreamTagger([log], discard=['foo'])
        result.startTestRun()
        result.status()
        result.status(test_tags=None)
        result.status(test_tags=set(['foo']))
        result.status(test_tags=set(['bar']))
        result.status(test_tags=set(['foo', 'bar']))
        result.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('status', None, None, None, True, None, None, False, None, None, None),
            ('status', None, None, None, True, None, None, False, None, None, None),
            ('status', None, None, None, True, None, None, False, None, None, None),
            ('status', None, None, set(['bar']), True, None, None, False, None, None, None),
            ('status', None, None, set(['bar']), True, None, None, False, None, None, None),
            ('stopTestRun',),
            ], log._events)


class TestStreamToDict(TestCase):

    def test_hung_test(self):
        tests = []
        result = StreamToDict(tests.append)
        result.startTestRun()
        result.status('foo', 'inprogress')
        self.assertEqual([], tests)
        result.stopTestRun()
        self.assertEqual([
            {'id': 'foo', 'tags': set(), 'details': {}, 'status': 'inprogress',
             'timestamps': [None, None]}
            ], tests)

    def test_all_terminal_states_reported(self):
        tests = []
        result = StreamToDict(tests.append)
        result.startTestRun()
        result.status('success', 'success')
        result.status('skip', 'skip')
        result.status('exists', 'exists')
        result.status('fail', 'fail')
        result.status('xfail', 'xfail')
        result.status('uxsuccess', 'uxsuccess')
        self.assertThat(tests, HasLength(6))
        self.assertEqual(
            ['success', 'skip', 'exists', 'fail', 'xfail', 'uxsuccess'],
            [test['id'] for test in tests])
        result.stopTestRun()
        self.assertThat(tests, HasLength(6))

    def test_files_reported(self):
        tests = []
        result = StreamToDict(tests.append)
        result.startTestRun()
        result.status(file_name="some log.txt",
            file_bytes=_b("1234 log message"), eof=True,
            mime_type="text/plain; charset=utf8", test_id="foo.bar")
        result.status(file_name="another file",
            file_bytes=_b("""Traceback..."""), test_id="foo.bar")
        result.stopTestRun()
        self.assertThat(tests, HasLength(1))
        test = tests[0]
        self.assertEqual("foo.bar", test['id'])
        self.assertEqual("unknown", test['status'])
        details = test['details']
        self.assertEqual(
            _u("1234 log message"), details['some log.txt'].as_text())
        self.assertEqual(
            _b("Traceback..."),
            _b('').join(details['another file'].iter_bytes()))
        self.assertEqual(
            "application/octet-stream", repr(details['another file'].content_type))

    def test_bad_mime(self):
        # Testtools was making bad mime types, this tests that the specific
        # corruption is catered for.
        return
        tests = []
        result = StreamToDict(tests.append)
        result.startTestRun()
        result.status(file_name="file", file_bytes=b'a',
            mime_type='text/plain; charset=utf8, language=python',
            test_id='id')
        result.stopTestRun()
        self.assertThat(tests, HasLength(1))
        test = tests[0]
        self.assertEqual("id", test['id'])
        details = test['details']
        self.assertEqual(_u("a"), details['file'].as_text())
        self.assertEqual(
            "text/plain; charset=\"utf8\"",
            repr(details['file'].content_type))

    def test_timestamps(self):
        tests = []
        result = StreamToDict(tests.append)
        result.startTestRun()
        result.status(test_id='foo', test_status='inprogress', timestamp="A")
        result.status(test_id='foo', test_status='success', timestamp="B")
        result.status(test_id='bar', test_status='inprogress', timestamp="C")
        result.stopTestRun()
        self.assertThat(tests, HasLength(2))
        self.assertEqual(["A", "B"], tests[0]['timestamps'])
        self.assertEqual(["C", None], tests[1]['timestamps'])


class TestExtendedToStreamDecorator(TestCase):

    def test_explicit_time(self):
        log = LoggingStreamResult()
        result = ExtendedToStreamDecorator(log)
        result.startTestRun()
        now = datetime.datetime.now(utc)
        result.time(now)
        result.startTest(self)
        result.addSuccess(self)
        result.stopTest(self)
        result.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('status',
             'testtools.tests.test_testresult.TestExtendedToStreamDecorator.test_explicit_time',
             'inprogress',
             None,
             True,
             None,
             None,
             False,
             None,
             None,
             now),
            ('status',
             'testtools.tests.test_testresult.TestExtendedToStreamDecorator.test_explicit_time',
             'success',
              set(),
              True,
              None,
              None,
              False,
              None,
              None,
              now),
             ('stopTestRun',)], log._events)

    def test_wasSuccessful_after_stopTestRun(self):
        log = LoggingStreamResult()
        result = ExtendedToStreamDecorator(log)
        result.startTestRun()
        result.status(test_id='foo', test_status='fail')
        result.stopTestRun()
        self.assertEqual(False, result.wasSuccessful())


class TestStreamFailFast(TestCase):

    def test_inprogress(self):
        result = StreamFailFast(self.fail)
        result.status('foo', 'inprogress')

    def test_exists(self):
        result = StreamFailFast(self.fail)
        result.status('foo', 'exists')

    def test_xfail(self):
        result = StreamFailFast(self.fail)
        result.status('foo', 'xfail')

    def test_uxsuccess(self):
        calls = []
        def hook():
            calls.append("called")
        result = StreamFailFast(hook)
        result.status('foo', 'uxsuccess')
        result.status('foo', 'uxsuccess')
        self.assertEqual(['called', 'called'], calls)

    def test_success(self):
        result = StreamFailFast(self.fail)
        result.status('foo', 'success')

    def test_fail(self):
        calls = []
        def hook():
            calls.append("called")
        result = StreamFailFast(hook)
        result.status('foo', 'fail')
        result.status('foo', 'fail')
        self.assertEqual(['called', 'called'], calls)

    def test_skip(self):
        result = StreamFailFast(self.fail)
        result.status('foo', 'skip')


class TestStreamSummary(TestCase):

    def test_attributes(self):
        result = StreamSummary()
        result.startTestRun()
        self.assertEqual([], result.failures)
        self.assertEqual([], result.errors)
        self.assertEqual([], result.skipped)
        self.assertEqual([], result.expectedFailures)
        self.assertEqual([], result.unexpectedSuccesses)
        self.assertEqual(0, result.testsRun)

    def test_startTestRun(self):
        result = StreamSummary()
        result.startTestRun()
        result.failures.append('x')
        result.errors.append('x')
        result.skipped.append('x')
        result.expectedFailures.append('x')
        result.unexpectedSuccesses.append('x')
        result.testsRun = 1
        result.startTestRun()
        self.assertEqual([], result.failures)
        self.assertEqual([], result.errors)
        self.assertEqual([], result.skipped)
        self.assertEqual([], result.expectedFailures)
        self.assertEqual([], result.unexpectedSuccesses)
        self.assertEqual(0, result.testsRun)

    def test_wasSuccessful(self):
        # wasSuccessful returns False if any of
        # failures/errors is non-empty.
        result = StreamSummary()
        result.startTestRun()
        self.assertEqual(True, result.wasSuccessful())
        result.failures.append('x')
        self.assertEqual(False, result.wasSuccessful())
        result.startTestRun()
        result.errors.append('x')
        self.assertEqual(False, result.wasSuccessful())
        result.startTestRun()
        result.skipped.append('x')
        self.assertEqual(True, result.wasSuccessful())
        result.startTestRun()
        result.expectedFailures.append('x')
        self.assertEqual(True, result.wasSuccessful())
        result.startTestRun()
        result.unexpectedSuccesses.append('x')
        self.assertEqual(True, result.wasSuccessful())

    def test_stopTestRun(self):
        result = StreamSummary()
        # terminal successful codes.
        result.startTestRun()
        result.status("foo", "inprogress")
        result.status("foo", "success")
        result.status("bar", "skip")
        result.status("baz", "exists")
        result.stopTestRun()
        self.assertEqual(True, result.wasSuccessful())
        # Existence is terminal but doesn't count as 'running' a test.
        self.assertEqual(2, result.testsRun)

    def test_stopTestRun_inprogress_test_fails(self):
        # Tests inprogress at stopTestRun trigger a failure.
        result = StreamSummary()
        result.startTestRun()
        result.status("foo", "inprogress")
        result.stopTestRun()
        self.assertEqual(False, result.wasSuccessful())
        self.assertThat(result.errors, HasLength(1))
        self.assertEqual("foo", result.errors[0][0].id())
        self.assertEqual("Test did not complete", result.errors[0][1])
        # interim state detection handles route codes - while duplicate ids in
        # one run is undesirable, it may happen (e.g. with repeated tests).
        result.startTestRun()
        result.status("foo", "inprogress")
        result.status("foo", "inprogress", route_code="A")
        result.status("foo", "success", route_code="A")
        result.stopTestRun()
        self.assertEqual(False, result.wasSuccessful())

    def test_status_skip(self):
        # when skip is seen, a synthetic test is reported with reason captured
        # from the 'reason' file attachment if any.
        result = StreamSummary()
        result.startTestRun()
        result.status(file_name="reason",
            file_bytes=_b("Missing dependency"), eof=True,
            mime_type="text/plain; charset=utf8", test_id="foo.bar")
        result.status("foo.bar", "skip")
        self.assertThat(result.skipped, HasLength(1))
        self.assertEqual("foo.bar", result.skipped[0][0].id())
        self.assertEqual(_u("Missing dependency"), result.skipped[0][1])

    def _report_files(self, result):
        result.status(file_name="some log.txt",
            file_bytes=_b("1234 log message"), eof=True,
            mime_type="text/plain; charset=utf8", test_id="foo.bar")
        result.status(file_name="traceback",
            file_bytes=_b("""Traceback (most recent call last):
  File "testtools/tests/test_testresult.py", line 607, in test_stopTestRun
      AllMatch(Equals([('startTestRun',), ('stopTestRun',)])))
testtools.matchers._impl.MismatchError: Differences: [
[('startTestRun',), ('stopTestRun',)] != []
[('startTestRun',), ('stopTestRun',)] != []
]
"""), eof=True, mime_type="text/plain; charset=utf8", test_id="foo.bar")

    files_message = Equals(_u("""some log.txt: {{{1234 log message}}}

Traceback (most recent call last):
  File "testtools/tests/test_testresult.py", line 607, in test_stopTestRun
      AllMatch(Equals([('startTestRun',), ('stopTestRun',)])))
testtools.matchers._impl.MismatchError: Differences: [
[('startTestRun',), ('stopTestRun',)] != []
[('startTestRun',), ('stopTestRun',)] != []
]
"""))

    def test_status_fail(self):
        # when fail is seen, a synthetic test is reported with all files
        # attached shown as the message.
        result = StreamSummary()
        result.startTestRun()
        self._report_files(result)
        result.status("foo.bar", "fail")
        self.assertThat(result.errors, HasLength(1))
        self.assertEqual("foo.bar", result.errors[0][0].id())
        self.assertThat(result.errors[0][1], self.files_message)

    def test_status_xfail(self):
        # when xfail is seen, a synthetic test is reported with all files
        # attached shown as the message.
        result = StreamSummary()
        result.startTestRun()
        self._report_files(result)
        result.status("foo.bar", "xfail")
        self.assertThat(result.expectedFailures, HasLength(1))
        self.assertEqual("foo.bar", result.expectedFailures[0][0].id())
        self.assertThat(result.expectedFailures[0][1], self.files_message)

    def test_status_uxsuccess(self):
        # when uxsuccess is seen, a synthetic test is reported.
        result = StreamSummary()
        result.startTestRun()
        result.status("foo.bar", "uxsuccess")
        self.assertThat(result.unexpectedSuccesses, HasLength(1))
        self.assertEqual("foo.bar", result.unexpectedSuccesses[0].id())


class TestTestControl(TestCase):

    def test_default(self):
        self.assertEqual(False, TestControl().shouldStop)

    def test_stop(self):
        control = TestControl()
        control.stop()
        self.assertEqual(True, control.shouldStop)


class TestTestResult(TestCase):
    """Tests for 'TestResult'."""

    run_tests_with = FullStackRunTest

    def makeResult(self):
        """Make an arbitrary result for testing."""
        return TestResult()

    def test_addSkipped(self):
        # Calling addSkip on a TestResult records the test that was skipped in
        # its skip_reasons dict.
        result = self.makeResult()
        result.addSkip(self, _u("Skipped for some reason"))
        self.assertEqual({_u("Skipped for some reason"):[self]},
            result.skip_reasons)
        result.addSkip(self, _u("Skipped for some reason"))
        self.assertEqual({_u("Skipped for some reason"):[self, self]},
            result.skip_reasons)
        result.addSkip(self, _u("Skipped for another reason"))
        self.assertEqual({_u("Skipped for some reason"):[self, self],
            _u("Skipped for another reason"):[self]},
            result.skip_reasons)

    def test_now_datetime_now(self):
        result = self.makeResult()
        olddatetime = testresult.real.datetime
        def restore():
            testresult.real.datetime = olddatetime
        self.addCleanup(restore)
        class Module:
            pass
        now = datetime.datetime.now(utc)
        stubdatetime = Module()
        stubdatetime.datetime = Module()
        stubdatetime.datetime.now = lambda tz: now
        testresult.real.datetime = stubdatetime
        # Calling _now() looks up the time.
        self.assertEqual(now, result._now())
        then = now + datetime.timedelta(0, 1)
        # Set an explicit datetime, which gets returned from then on.
        result.time(then)
        self.assertNotEqual(now, result._now())
        self.assertEqual(then, result._now())
        # go back to looking it up.
        result.time(None)
        self.assertEqual(now, result._now())

    def test_now_datetime_time(self):
        result = self.makeResult()
        now = datetime.datetime.now(utc)
        result.time(now)
        self.assertEqual(now, result._now())

    def test_traceback_formatting_without_stack_hidden(self):
        # During the testtools test run, we show our levels of the stack,
        # because we want to be able to use our test suite to debug our own
        # code.
        result = self.makeResult()
        test = make_erroring_test()
        test.run(result)
        self.assertThat(
            result.errors[0][1],
            DocTestMatches(
                'Traceback (most recent call last):\n'
                '  File "...testtools...runtest.py", line ..., in _run_user\n'
                '    return fn(*args, **kwargs)\n'
                '  File "...testtools...testcase.py", line ..., in _run_test_method\n'
                '    return self._get_test_method()()\n'
                '  File "...testtools...tests...test_testresult.py", line ..., in error\n'
                '    1/0\n'
                'ZeroDivisionError: ...\n',
                doctest.ELLIPSIS | doctest.REPORT_UDIFF))

    def test_traceback_formatting_with_stack_hidden(self):
        result = self.makeResult()
        test = make_erroring_test()
        run_with_stack_hidden(True, test.run, result)
        self.assertThat(
            result.errors[0][1],
            DocTestMatches(
                'Traceback (most recent call last):\n'
                '  File "...testtools...tests...test_testresult.py", line ..., in error\n'
                '    1/0\n'
                'ZeroDivisionError: ...\n',
                doctest.ELLIPSIS))

    def test_traceback_formatting_with_stack_hidden_mismatch(self):
        result = self.makeResult()
        test = make_mismatching_test()
        run_with_stack_hidden(True, test.run, result)
        self.assertThat(
            result.failures[0][1],
            DocTestMatches(
                'Traceback (most recent call last):\n'
                '  File "...testtools...tests...test_testresult.py", line ..., in mismatch\n'
                '    self.assertEqual(1, 2)\n'
                '...MismatchError: 1 != 2\n',
                doctest.ELLIPSIS))

    def test_exc_info_to_unicode(self):
        # subunit upcalls to TestResult._exc_info_to_unicode, so we need to
        # make sure that it's there.
        #
        # See <https://bugs.launchpad.net/testtools/+bug/929063>.
        test = make_erroring_test()
        exc_info = make_exception_info(RuntimeError, "foo")
        result = self.makeResult()
        text_traceback = result._exc_info_to_unicode(exc_info, test)
        self.assertEqual(
            TracebackContent(exc_info, test).as_text(), text_traceback)


class TestMultiTestResult(TestCase):
    """Tests for 'MultiTestResult'."""

    def setUp(self):
        super(TestMultiTestResult, self).setUp()
        self.result1 = LoggingResult([])
        self.result2 = LoggingResult([])
        self.multiResult = MultiTestResult(self.result1, self.result2)

    def assertResultLogsEqual(self, expectedEvents):
        """Assert that our test results have received the expected events."""
        self.assertEqual(expectedEvents, self.result1._events)
        self.assertEqual(expectedEvents, self.result2._events)

    def test_repr(self):
        self.assertEqual(
            '<MultiTestResult (%r, %r)>' % (
                ExtendedToOriginalDecorator(self.result1),
                ExtendedToOriginalDecorator(self.result2)),
            repr(self.multiResult))

    def test_empty(self):
        # Initializing a `MultiTestResult` doesn't do anything to its
        # `TestResult`s.
        self.assertResultLogsEqual([])

    def test_failfast_get(self):
        # Reading reads from the first one - arbitrary choice.
        self.assertEqual(False, self.multiResult.failfast)
        self.result1.failfast = True
        self.assertEqual(True, self.multiResult.failfast)

    def test_failfast_set(self):
        # Writing writes to all.
        self.multiResult.failfast = True
        self.assertEqual(True, self.result1.failfast)
        self.assertEqual(True, self.result2.failfast)

    def test_shouldStop(self):
        self.assertFalse(self.multiResult.shouldStop)
        self.result2.stop()
        # NB: result1 is not stopped: MultiTestResult has to combine the
        # values.
        self.assertTrue(self.multiResult.shouldStop)

    def test_startTest(self):
        # Calling `startTest` on a `MultiTestResult` calls `startTest` on all
        # its `TestResult`s.
        self.multiResult.startTest(self)
        self.assertResultLogsEqual([('startTest', self)])

    def test_stop(self):
        self.assertFalse(self.multiResult.shouldStop)
        self.multiResult.stop()
        self.assertResultLogsEqual(['stop'])

    def test_stopTest(self):
        # Calling `stopTest` on a `MultiTestResult` calls `stopTest` on all
        # its `TestResult`s.
        self.multiResult.stopTest(self)
        self.assertResultLogsEqual([('stopTest', self)])

    def test_addSkipped(self):
        # Calling `addSkip` on a `MultiTestResult` calls addSkip on its
        # results.
        reason = _u("Skipped for some reason")
        self.multiResult.addSkip(self, reason)
        self.assertResultLogsEqual([('addSkip', self, reason)])

    def test_addSuccess(self):
        # Calling `addSuccess` on a `MultiTestResult` calls `addSuccess` on
        # all its `TestResult`s.
        self.multiResult.addSuccess(self)
        self.assertResultLogsEqual([('addSuccess', self)])

    def test_done(self):
        # Calling `done` on a `MultiTestResult` calls `done` on all its
        # `TestResult`s.
        self.multiResult.done()
        self.assertResultLogsEqual([('done')])

    def test_addFailure(self):
        # Calling `addFailure` on a `MultiTestResult` calls `addFailure` on
        # all its `TestResult`s.
        exc_info = make_exception_info(AssertionError, 'failure')
        self.multiResult.addFailure(self, exc_info)
        self.assertResultLogsEqual([('addFailure', self, exc_info)])

    def test_addError(self):
        # Calling `addError` on a `MultiTestResult` calls `addError` on all
        # its `TestResult`s.
        exc_info = make_exception_info(RuntimeError, 'error')
        self.multiResult.addError(self, exc_info)
        self.assertResultLogsEqual([('addError', self, exc_info)])

    def test_startTestRun(self):
        # Calling `startTestRun` on a `MultiTestResult` forwards to all its
        # `TestResult`s.
        self.multiResult.startTestRun()
        self.assertResultLogsEqual([('startTestRun')])

    def test_stopTestRun(self):
        # Calling `stopTestRun` on a `MultiTestResult` forwards to all its
        # `TestResult`s.
        self.multiResult.stopTestRun()
        self.assertResultLogsEqual([('stopTestRun')])

    def test_stopTestRun_returns_results(self):
        # `MultiTestResult.stopTestRun` returns a tuple of all of the return
        # values the `stopTestRun`s that it forwards to.
        class Result(LoggingResult):
            def stopTestRun(self):
                super(Result, self).stopTestRun()
                return 'foo'
        multi_result = MultiTestResult(Result([]), Result([]))
        result = multi_result.stopTestRun()
        self.assertEqual(('foo', 'foo'), result)

    def test_tags(self):
        # Calling `tags` on a `MultiTestResult` calls `tags` on all its
        # `TestResult`s.
        added_tags = set(['foo', 'bar'])
        removed_tags = set(['eggs'])
        self.multiResult.tags(added_tags, removed_tags)
        self.assertResultLogsEqual([('tags', added_tags, removed_tags)])

    def test_time(self):
        # the time call is dispatched, not eaten by the base class
        self.multiResult.time('foo')
        self.assertResultLogsEqual([('time', 'foo')])


class TestTextTestResult(TestCase):
    """Tests for 'TextTestResult'."""

    def setUp(self):
        super(TestTextTestResult, self).setUp()
        self.result = TextTestResult(StringIO())

    def getvalue(self):
        return self.result.stream.getvalue()

    def test__init_sets_stream(self):
        result = TextTestResult("fp")
        self.assertEqual("fp", result.stream)

    def reset_output(self):
        self.result.stream = StringIO()

    def test_startTestRun(self):
        self.result.startTestRun()
        self.assertEqual("Tests running...\n", self.getvalue())

    def test_stopTestRun_count_many(self):
        test = make_test()
        self.result.startTestRun()
        self.result.startTest(test)
        self.result.stopTest(test)
        self.result.startTest(test)
        self.result.stopTest(test)
        self.result.stream = StringIO()
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("\nRan 2 tests in ...s\n...", doctest.ELLIPSIS))

    def test_stopTestRun_count_single(self):
        test = make_test()
        self.result.startTestRun()
        self.result.startTest(test)
        self.result.stopTest(test)
        self.reset_output()
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("\nRan 1 test in ...s\nOK\n", doctest.ELLIPSIS))

    def test_stopTestRun_count_zero(self):
        self.result.startTestRun()
        self.reset_output()
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("\nRan 0 tests in ...s\nOK\n", doctest.ELLIPSIS))

    def test_stopTestRun_current_time(self):
        test = make_test()
        now = datetime.datetime.now(utc)
        self.result.time(now)
        self.result.startTestRun()
        self.result.startTest(test)
        now = now + datetime.timedelta(0, 0, 0, 1)
        self.result.time(now)
        self.result.stopTest(test)
        self.reset_output()
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("... in 0.001s\n...", doctest.ELLIPSIS))

    def test_stopTestRun_successful(self):
        self.result.startTestRun()
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("...\nOK\n", doctest.ELLIPSIS))

    def test_stopTestRun_not_successful_failure(self):
        test = make_failing_test()
        self.result.startTestRun()
        test.run(self.result)
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("...\nFAILED (failures=1)\n", doctest.ELLIPSIS))

    def test_stopTestRun_not_successful_error(self):
        test = make_erroring_test()
        self.result.startTestRun()
        test.run(self.result)
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("...\nFAILED (failures=1)\n", doctest.ELLIPSIS))

    def test_stopTestRun_not_successful_unexpected_success(self):
        test = make_unexpectedly_successful_test()
        self.result.startTestRun()
        test.run(self.result)
        self.result.stopTestRun()
        self.assertThat(self.getvalue(),
            DocTestMatches("...\nFAILED (failures=1)\n", doctest.ELLIPSIS))

    def test_stopTestRun_shows_details(self):
        self.skip("Disabled per bug 1188420")
        def run_tests():
            self.result.startTestRun()
            make_erroring_test().run(self.result)
            make_unexpectedly_successful_test().run(self.result)
            make_failing_test().run(self.result)
            self.reset_output()
            self.result.stopTestRun()
        run_with_stack_hidden(True, run_tests)
        self.assertThat(self.getvalue(),
            DocTestMatches("""...======================================================================
ERROR: testtools.tests.test_testresult.Test.error
----------------------------------------------------------------------
Traceback (most recent call last):
  File "...testtools...tests...test_testresult.py", line ..., in error
    1/0
ZeroDivisionError:... divi... by zero...
======================================================================
FAIL: testtools.tests.test_testresult.Test.failed
----------------------------------------------------------------------
Traceback (most recent call last):
  File "...testtools...tests...test_testresult.py", line ..., in failed
    self.fail("yo!")
AssertionError: yo!
======================================================================
UNEXPECTED SUCCESS: testtools.tests.test_testresult.Test.succeeded
----------------------------------------------------------------------
...""", doctest.ELLIPSIS | doctest.REPORT_NDIFF))


class TestThreadSafeForwardingResult(TestCase):
    """Tests for `TestThreadSafeForwardingResult`."""

    def make_results(self, n):
        events = []
        target = LoggingResult(events)
        semaphore = threading.Semaphore(1)
        return [
            ThreadsafeForwardingResult(target, semaphore)
            for i in range(n)], events

    def test_nonforwarding_methods(self):
        # startTest and stopTest are not forwarded because they need to be
        # batched.
        [result], events = self.make_results(1)
        result.startTest(self)
        result.stopTest(self)
        self.assertEqual([], events)

    def test_tags_not_forwarded(self):
        # Tags need to be batched for each test, so they aren't forwarded
        # until a test runs.
        [result], events = self.make_results(1)
        result.tags(set(['foo']), set(['bar']))
        self.assertEqual([], events)

    def test_global_tags_simple(self):
        # Tags specified outside of a test result are global. When a test's
        # results are finally forwarded, we send through these global tags
        # *as* test specific tags, because as a multiplexer there should be no
        # way for a global tag on an input stream to affect tests from other
        # streams - we can just always issue test local tags.
        [result], events = self.make_results(1)
        result.tags(set(['foo']), set())
        result.time(1)
        result.startTest(self)
        result.time(2)
        result.addSuccess(self)
        self.assertEqual(
            [('time', 1),
             ('startTest', self),
             ('time', 2),
             ('tags', set(['foo']), set()),
             ('addSuccess', self),
             ('stopTest', self),
             ], events)

    def test_global_tags_complex(self):
        # Multiple calls to tags() in a global context are buffered until the
        # next test completes and are issued as part of of the test context,
        # because they cannot be issued until the output result is locked.
        # The sample data shows them being merged together, this is, strictly
        # speaking incidental - they could be issued separately (in-order) and
        # still be legitimate.
        [result], events = self.make_results(1)
        result.tags(set(['foo', 'bar']), set(['baz', 'qux']))
        result.tags(set(['cat', 'qux']), set(['bar', 'dog']))
        result.time(1)
        result.startTest(self)
        result.time(2)
        result.addSuccess(self)
        self.assertEqual(
            [('time', 1),
             ('startTest', self),
             ('time', 2),
             ('tags', set(['cat', 'foo', 'qux']), set(['dog', 'bar', 'baz'])),
             ('addSuccess', self),
             ('stopTest', self),
             ], events)

    def test_local_tags(self):
        # Any tags set within a test context are forwarded in that test
        # context when the result is finally forwarded.  This means that the
        # tags for the test are part of the atomic message communicating
        # everything about that test.
        [result], events = self.make_results(1)
        result.time(1)
        result.startTest(self)
        result.tags(set(['foo']), set([]))
        result.tags(set(), set(['bar']))
        result.time(2)
        result.addSuccess(self)
        self.assertEqual(
            [('time', 1),
             ('startTest', self),
             ('time', 2),
             ('tags', set(['foo']), set(['bar'])),
             ('addSuccess', self),
             ('stopTest', self),
             ], events)

    def test_local_tags_dont_leak(self):
        # A tag set during a test is local to that test and is not set during
        # the tests that follow.
        [result], events = self.make_results(1)
        a, b = PlaceHolder('a'), PlaceHolder('b')
        result.time(1)
        result.startTest(a)
        result.tags(set(['foo']), set([]))
        result.time(2)
        result.addSuccess(a)
        result.stopTest(a)
        result.time(3)
        result.startTest(b)
        result.time(4)
        result.addSuccess(b)
        result.stopTest(b)
        self.assertEqual(
            [('time', 1),
             ('startTest', a),
             ('time', 2),
             ('tags', set(['foo']), set()),
             ('addSuccess', a),
             ('stopTest', a),
             ('time', 3),
             ('startTest', b),
             ('time', 4),
             ('addSuccess', b),
             ('stopTest', b),
             ], events)

    def test_startTestRun(self):
        # Calls to startTestRun are not batched, because we are only
        # interested in sending tests atomically, not the whole run.
        [result1, result2], events = self.make_results(2)
        result1.startTestRun()
        result2.startTestRun()
        self.assertEqual(["startTestRun", "startTestRun"], events)

    def test_stopTestRun(self):
        # Calls to stopTestRun are not batched, because we are only
        # interested in sending tests atomically, not the whole run.
        [result1, result2], events = self.make_results(2)
        result1.stopTestRun()
        result2.stopTestRun()
        self.assertEqual(["stopTestRun", "stopTestRun"], events)

    def test_forward_addError(self):
        # Once we receive an addError event, we forward all of the events for
        # that test, as we now know that test is complete.
        [result], events = self.make_results(1)
        exc_info = make_exception_info(RuntimeError, 'error')
        start_time = datetime.datetime.utcfromtimestamp(1.489)
        end_time = datetime.datetime.utcfromtimestamp(51.476)
        result.time(start_time)
        result.startTest(self)
        result.time(end_time)
        result.addError(self, exc_info)
        self.assertEqual([
            ('time', start_time),
            ('startTest', self),
            ('time', end_time),
            ('addError', self, exc_info),
            ('stopTest', self),
            ], events)

    def test_forward_addFailure(self):
        # Once we receive an addFailure event, we forward all of the events
        # for that test, as we now know that test is complete.
        [result], events = self.make_results(1)
        exc_info = make_exception_info(AssertionError, 'failure')
        start_time = datetime.datetime.utcfromtimestamp(2.489)
        end_time = datetime.datetime.utcfromtimestamp(3.476)
        result.time(start_time)
        result.startTest(self)
        result.time(end_time)
        result.addFailure(self, exc_info)
        self.assertEqual([
            ('time', start_time),
            ('startTest', self),
            ('time', end_time),
            ('addFailure', self, exc_info),
            ('stopTest', self),
            ], events)

    def test_forward_addSkip(self):
        # Once we receive an addSkip event, we forward all of the events for
        # that test, as we now know that test is complete.
        [result], events = self.make_results(1)
        reason = _u("Skipped for some reason")
        start_time = datetime.datetime.utcfromtimestamp(4.489)
        end_time = datetime.datetime.utcfromtimestamp(5.476)
        result.time(start_time)
        result.startTest(self)
        result.time(end_time)
        result.addSkip(self, reason)
        self.assertEqual([
            ('time', start_time),
            ('startTest', self),
            ('time', end_time),
            ('addSkip', self, reason),
            ('stopTest', self),
            ], events)

    def test_forward_addSuccess(self):
        # Once we receive an addSuccess event, we forward all of the events
        # for that test, as we now know that test is complete.
        [result], events = self.make_results(1)
        start_time = datetime.datetime.utcfromtimestamp(6.489)
        end_time = datetime.datetime.utcfromtimestamp(7.476)
        result.time(start_time)
        result.startTest(self)
        result.time(end_time)
        result.addSuccess(self)
        self.assertEqual([
            ('time', start_time),
            ('startTest', self),
            ('time', end_time),
            ('addSuccess', self),
            ('stopTest', self),
            ], events)

    def test_only_one_test_at_a_time(self):
        # Even if there are multiple ThreadsafeForwardingResults forwarding to
        # the same target result, the target result only receives the complete
        # events for one test at a time.
        [result1, result2], events = self.make_results(2)
        test1, test2 = self, make_test()
        start_time1 = datetime.datetime.utcfromtimestamp(1.489)
        end_time1 = datetime.datetime.utcfromtimestamp(2.476)
        start_time2 = datetime.datetime.utcfromtimestamp(3.489)
        end_time2 = datetime.datetime.utcfromtimestamp(4.489)
        result1.time(start_time1)
        result2.time(start_time2)
        result1.startTest(test1)
        result2.startTest(test2)
        result1.time(end_time1)
        result2.time(end_time2)
        result2.addSuccess(test2)
        result1.addSuccess(test1)
        self.assertEqual([
            # test2 finishes first, and so is flushed first.
            ('time', start_time2),
            ('startTest', test2),
            ('time', end_time2),
            ('addSuccess', test2),
            ('stopTest', test2),
            # test1 finishes next, and thus follows.
            ('time', start_time1),
            ('startTest', test1),
            ('time', end_time1),
            ('addSuccess', test1),
            ('stopTest', test1),
            ], events)


class TestMergeTags(TestCase):

    def test_merge_unseen_gone_tag(self):
        # If an incoming "gone" tag isn't currently tagged one way or the
        # other, add it to the "gone" tags.
        current_tags = set(['present']), set(['missing'])
        changing_tags = set(), set(['going'])
        expected = set(['present']), set(['missing', 'going'])
        self.assertEqual(
            expected, _merge_tags(current_tags, changing_tags))

    def test_merge_incoming_gone_tag_with_current_new_tag(self):
        # If one of the incoming "gone" tags is one of the existing "new"
        # tags, then it overrides the "new" tag, leaving it marked as "gone".
        current_tags = set(['present', 'going']), set(['missing'])
        changing_tags = set(), set(['going'])
        expected = set(['present']), set(['missing', 'going'])
        self.assertEqual(
            expected, _merge_tags(current_tags, changing_tags))

    def test_merge_unseen_new_tag(self):
        current_tags = set(['present']), set(['missing'])
        changing_tags = set(['coming']), set()
        expected = set(['coming', 'present']), set(['missing'])
        self.assertEqual(
            expected, _merge_tags(current_tags, changing_tags))

    def test_merge_incoming_new_tag_with_current_gone_tag(self):
        # If one of the incoming "new" tags is currently marked as "gone",
        # then it overrides the "gone" tag, leaving it marked as "new".
        current_tags = set(['present']), set(['coming', 'missing'])
        changing_tags = set(['coming']), set()
        expected = set(['coming', 'present']), set(['missing'])
        self.assertEqual(
            expected, _merge_tags(current_tags, changing_tags))


class TestStreamResultRouter(TestCase):

    def test_start_stop_test_run_no_fallback(self):
        result = StreamResultRouter()
        result.startTestRun()
        result.stopTestRun()

    def test_no_fallback_errors(self):
        self.assertRaises(Exception, StreamResultRouter().status, test_id='f')

    def test_fallback_calls(self):
        fallback = LoggingStreamResult()
        result = StreamResultRouter(fallback)
        result.startTestRun()
        result.status(test_id='foo')
        result.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('status', 'foo', None, None, True, None, None, False, None, None,
             None),
            ('stopTestRun',),
            ],
            fallback._events)

    def test_fallback_no_do_start_stop_run(self):
        fallback = LoggingStreamResult()
        result = StreamResultRouter(fallback, do_start_stop_run=False)
        result.startTestRun()
        result.status(test_id='foo')
        result.stopTestRun()
        self.assertEqual([
            ('status', 'foo', None, None, True, None, None, False, None, None,
             None)
            ],
            fallback._events)

    def test_add_rule_bad_policy(self):
        router = StreamResultRouter()
        target = LoggingStreamResult()
        self.assertRaises(ValueError, router.add_rule, target, 'route_code_prefixa',
            route_prefix='0')

    def test_add_rule_extra_policy_arg(self):
        router = StreamResultRouter()
        target = LoggingStreamResult()
        self.assertRaises(TypeError, router.add_rule, target, 'route_code_prefix',
            route_prefix='0', foo=1)

    def test_add_rule_missing_prefix(self):
        router = StreamResultRouter()
        target = LoggingStreamResult()
        self.assertRaises(TypeError, router.add_rule, target, 'route_code_prefix')

    def test_add_rule_slash_in_prefix(self):
        router = StreamResultRouter()
        target = LoggingStreamResult()
        self.assertRaises(TypeError, router.add_rule, target, 'route_code_prefix',
            route_prefix='0/')

    def test_add_rule_route_code_consume_False(self):
        fallback = LoggingStreamResult()
        target = LoggingStreamResult()
        router = StreamResultRouter(fallback)
        router.add_rule(target, 'route_code_prefix', route_prefix='0')
        router.status(test_id='foo', route_code='0')
        router.status(test_id='foo', route_code='0/1')
        router.status(test_id='foo')
        self.assertEqual([
            ('status', 'foo', None, None, True, None, None, False, None, '0',
             None),
            ('status', 'foo', None, None, True, None, None, False, None, '0/1',
             None),
            ],
            target._events)
        self.assertEqual([
            ('status', 'foo', None, None, True, None, None, False, None, None,
             None),
            ],
            fallback._events)

    def test_add_rule_route_code_consume_True(self):
        fallback = LoggingStreamResult()
        target = LoggingStreamResult()
        router = StreamResultRouter(fallback)
        router.add_rule(
            target, 'route_code_prefix', route_prefix='0', consume_route=True)
        router.status(test_id='foo', route_code='0') # -> None
        router.status(test_id='foo', route_code='0/1') # -> 1
        router.status(test_id='foo', route_code='1') # -> fallback as-is.
        self.assertEqual([
            ('status', 'foo', None, None, True, None, None, False, None, None,
             None),
            ('status', 'foo', None, None, True, None, None, False, None, '1',
             None),
            ],
            target._events)
        self.assertEqual([
            ('status', 'foo', None, None, True, None, None, False, None, '1',
             None),
            ],
            fallback._events)

    def test_add_rule_test_id(self):
        nontest = LoggingStreamResult()
        test = LoggingStreamResult()
        router = StreamResultRouter(test)
        router.add_rule(nontest, 'test_id', test_id=None)
        router.status(test_id='foo', file_name="bar", file_bytes=b'')
        router.status(file_name="bar", file_bytes=b'')
        self.assertEqual([
            ('status', 'foo', None, None, True, 'bar', b'', False, None, None,
             None),], test._events)
        self.assertEqual([
            ('status', None, None, None, True, 'bar', b'', False, None, None,
             None),], nontest._events)

    def test_add_rule_do_start_stop_run(self):
        nontest = LoggingStreamResult()
        router = StreamResultRouter()
        router.add_rule(nontest, 'test_id', test_id=None, do_start_stop_run=True)
        router.startTestRun()
        router.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('stopTestRun',),
            ], nontest._events)

    def test_add_rule_do_start_stop_run_after_startTestRun(self):
        nontest = LoggingStreamResult()
        router = StreamResultRouter()
        router.startTestRun()
        router.add_rule(nontest, 'test_id', test_id=None, do_start_stop_run=True)
        router.stopTestRun()
        self.assertEqual([
            ('startTestRun',),
            ('stopTestRun',),
            ], nontest._events)


class TestStreamToQueue(TestCase):

    def make_result(self):
        queue = Queue()
        return queue, StreamToQueue(queue, "foo")

    def test_status(self):
        def check_event(event_dict, route=None, time=None):
            self.assertEqual("status", event_dict['event'])
            self.assertEqual("test", event_dict['test_id'])
            self.assertEqual("fail", event_dict['test_status'])
            self.assertEqual(set(["quux"]), event_dict['test_tags'])
            self.assertEqual(False, event_dict['runnable'])
            self.assertEqual("file", event_dict['file_name'])
            self.assertEqual(_b("content"), event_dict['file_bytes'])
            self.assertEqual(True, event_dict['eof'])
            self.assertEqual("quux", event_dict['mime_type'])
            self.assertEqual("test", event_dict['test_id'])
            self.assertEqual(route, event_dict['route_code'])
            self.assertEqual(time, event_dict['timestamp'])
        queue, result = self.make_result()
        result.status("test", "fail", test_tags=set(["quux"]), runnable=False,
            file_name="file", file_bytes=_b("content"), eof=True,
            mime_type="quux", route_code=None, timestamp=None)
        self.assertEqual(1, queue.qsize())
        a_time = datetime.datetime.now(utc)
        result.status("test", "fail", test_tags=set(["quux"]), runnable=False,
            file_name="file", file_bytes=_b("content"), eof=True,
            mime_type="quux", route_code="bar", timestamp=a_time)
        self.assertEqual(2, queue.qsize())
        check_event(queue.get(False), route="foo", time=None)
        check_event(queue.get(False), route="foo/bar", time=a_time)

    def testStartTestRun(self):
        queue, result = self.make_result()
        result.startTestRun()
        self.assertEqual(
            {'event':'startTestRun', 'result':result}, queue.get(False))
        self.assertTrue(queue.empty())

    def testStopTestRun(self):
        queue, result = self.make_result()
        result.stopTestRun()
        self.assertEqual(
            {'event':'stopTestRun', 'result':result}, queue.get(False))
        self.assertTrue(queue.empty())


class TestExtendedToOriginalResultDecoratorBase(TestCase):

    def make_26_result(self):
        self.result = Python26TestResult()
        self.make_converter()

    def make_27_result(self):
        self.result = Python27TestResult()
        self.make_converter()

    def make_converter(self):
        self.converter = ExtendedToOriginalDecorator(self.result)

    def make_extended_result(self):
        self.result = ExtendedTestResult()
        self.make_converter()

    def check_outcome_details(self, outcome):
        """Call an outcome with a details dict to be passed through."""
        # This dict is /not/ convertible - thats deliberate, as it should
        # not hit the conversion code path.
        details = {'foo': 'bar'}
        getattr(self.converter, outcome)(self, details=details)
        self.assertEqual([(outcome, self, details)], self.result._events)

    def get_details_and_string(self):
        """Get a details dict and expected string."""
        text1 = lambda: [_b("1\n2\n")]
        text2 = lambda: [_b("3\n4\n")]
        bin1 = lambda: [_b("5\n")]
        details = {'text 1': Content(ContentType('text', 'plain'), text1),
            'text 2': Content(ContentType('text', 'strange'), text2),
            'bin 1': Content(ContentType('application', 'binary'), bin1)}
        return (details,
                ("Binary content:\n"
                 "  bin 1 (application/binary)\n"
                 "\n"
                 "text 1: {{{\n"
                 "1\n"
                 "2\n"
                 "}}}\n"
                 "\n"
                 "text 2: {{{\n"
                 "3\n"
                 "4\n"
                 "}}}\n"))

    def check_outcome_details_to_exec_info(self, outcome, expected=None):
        """Call an outcome with a details dict to be made into exc_info."""
        # The conversion is a done using RemoteError and the string contents
        # of the text types in the details dict.
        if not expected:
            expected = outcome
        details, err_str = self.get_details_and_string()
        getattr(self.converter, outcome)(self, details=details)
        err = self.converter._details_to_exc_info(details)
        self.assertEqual([(expected, self, err)], self.result._events)

    def check_outcome_details_to_nothing(self, outcome, expected=None):
        """Call an outcome with a details dict to be swallowed."""
        if not expected:
            expected = outcome
        details = {'foo': 'bar'}
        getattr(self.converter, outcome)(self, details=details)
        self.assertEqual([(expected, self)], self.result._events)

    def check_outcome_details_to_string(self, outcome):
        """Call an outcome with a details dict to be stringified."""
        details, err_str = self.get_details_and_string()
        getattr(self.converter, outcome)(self, details=details)
        self.assertEqual([(outcome, self, err_str)], self.result._events)

    def check_outcome_details_to_arg(self, outcome, arg, extra_detail=None):
        """Call an outcome with a details dict to have an arg extracted."""
        details, _ = self.get_details_and_string()
        if extra_detail:
            details.update(extra_detail)
        getattr(self.converter, outcome)(self, details=details)
        self.assertEqual([(outcome, self, arg)], self.result._events)

    def check_outcome_exc_info(self, outcome, expected=None):
        """Check that calling a legacy outcome still works."""
        # calling some outcome with the legacy exc_info style api (no keyword
        # parameters) gets passed through.
        if not expected:
            expected = outcome
        err = sys.exc_info()
        getattr(self.converter, outcome)(self, err)
        self.assertEqual([(expected, self, err)], self.result._events)

    def check_outcome_exc_info_to_nothing(self, outcome, expected=None):
        """Check that calling a legacy outcome on a fallback works."""
        # calling some outcome with the legacy exc_info style api (no keyword
        # parameters) gets passed through.
        if not expected:
            expected = outcome
        err = sys.exc_info()
        getattr(self.converter, outcome)(self, err)
        self.assertEqual([(expected, self)], self.result._events)

    def check_outcome_nothing(self, outcome, expected=None):
        """Check that calling a legacy outcome still works."""
        if not expected:
            expected = outcome
        getattr(self.converter, outcome)(self)
        self.assertEqual([(expected, self)], self.result._events)

    def check_outcome_string_nothing(self, outcome, expected):
        """Check that calling outcome with a string calls expected."""
        getattr(self.converter, outcome)(self, "foo")
        self.assertEqual([(expected, self)], self.result._events)

    def check_outcome_string(self, outcome):
        """Check that calling outcome with a string works."""
        getattr(self.converter, outcome)(self, "foo")
        self.assertEqual([(outcome, self, "foo")], self.result._events)


class TestExtendedToOriginalResultDecorator(
    TestExtendedToOriginalResultDecoratorBase):

    def test_failfast_py26(self):
        self.make_26_result()
        self.assertEqual(False, self.converter.failfast)
        self.converter.failfast = True
        self.assertFalse(safe_hasattr(self.converter.decorated, 'failfast'))

    def test_failfast_py27(self):
        self.make_27_result()
        self.assertEqual(False, self.converter.failfast)
        # setting it should write it to the backing result
        self.converter.failfast = True
        self.assertEqual(True, self.converter.decorated.failfast)

    def test_progress_py26(self):
        self.make_26_result()
        self.converter.progress(1, 2)

    def test_progress_py27(self):
        self.make_27_result()
        self.converter.progress(1, 2)

    def test_progress_pyextended(self):
        self.make_extended_result()
        self.converter.progress(1, 2)
        self.assertEqual([('progress', 1, 2)], self.result._events)

    def test_shouldStop(self):
        self.make_26_result()
        self.assertEqual(False, self.converter.shouldStop)
        self.converter.decorated.stop()
        self.assertEqual(True, self.converter.shouldStop)

    def test_startTest_py26(self):
        self.make_26_result()
        self.converter.startTest(self)
        self.assertEqual([('startTest', self)], self.result._events)

    def test_startTest_py27(self):
        self.make_27_result()
        self.converter.startTest(self)
        self.assertEqual([('startTest', self)], self.result._events)

    def test_startTest_pyextended(self):
        self.make_extended_result()
        self.converter.startTest(self)
        self.assertEqual([('startTest', self)], self.result._events)

    def test_startTestRun_py26(self):
        self.make_26_result()
        self.converter.startTestRun()
        self.assertEqual([], self.result._events)

    def test_startTestRun_py27(self):
        self.make_27_result()
        self.converter.startTestRun()
        self.assertEqual([('startTestRun',)], self.result._events)

    def test_startTestRun_pyextended(self):
        self.make_extended_result()
        self.converter.startTestRun()
        self.assertEqual([('startTestRun',)], self.result._events)

    def test_stopTest_py26(self):
        self.make_26_result()
        self.converter.stopTest(self)
        self.assertEqual([('stopTest', self)], self.result._events)

    def test_stopTest_py27(self):
        self.make_27_result()
        self.converter.stopTest(self)
        self.assertEqual([('stopTest', self)], self.result._events)

    def test_stopTest_pyextended(self):
        self.make_extended_result()
        self.converter.stopTest(self)
        self.assertEqual([('stopTest', self)], self.result._events)

    def test_stopTestRun_py26(self):
        self.make_26_result()
        self.converter.stopTestRun()
        self.assertEqual([], self.result._events)

    def test_stopTestRun_py27(self):
        self.make_27_result()
        self.converter.stopTestRun()
        self.assertEqual([('stopTestRun',)], self.result._events)

    def test_stopTestRun_pyextended(self):
        self.make_extended_result()
        self.converter.stopTestRun()
        self.assertEqual([('stopTestRun',)], self.result._events)

    def test_tags_py26(self):
        self.make_26_result()
        self.converter.tags(set([1]), set([2]))

    def test_tags_py27(self):
        self.make_27_result()
        self.converter.tags(set([1]), set([2]))

    def test_tags_pyextended(self):
        self.make_extended_result()
        self.converter.tags(set([1]), set([2]))
        self.assertEqual([('tags', set([1]), set([2]))], self.result._events)

    def test_time_py26(self):
        self.make_26_result()
        self.converter.time(1)

    def test_time_py27(self):
        self.make_27_result()
        self.converter.time(1)

    def test_time_pyextended(self):
        self.make_extended_result()
        self.converter.time(1)
        self.assertEqual([('time', 1)], self.result._events)


class TestExtendedToOriginalAddError(TestExtendedToOriginalResultDecoratorBase):

    outcome = 'addError'

    def test_outcome_Original_py26(self):
        self.make_26_result()
        self.check_outcome_exc_info(self.outcome)

    def test_outcome_Original_py27(self):
        self.make_27_result()
        self.check_outcome_exc_info(self.outcome)

    def test_outcome_Original_pyextended(self):
        self.make_extended_result()
        self.check_outcome_exc_info(self.outcome)

    def test_outcome_Extended_py26(self):
        self.make_26_result()
        self.check_outcome_details_to_exec_info(self.outcome)

    def test_outcome_Extended_py27(self):
        self.make_27_result()
        self.check_outcome_details_to_exec_info(self.outcome)

    def test_outcome_Extended_pyextended(self):
        self.make_extended_result()
        self.check_outcome_details(self.outcome)

    def test_outcome__no_details(self):
        self.make_extended_result()
        self.assertThat(
            lambda: getattr(self.converter, self.outcome)(self),
            Raises(MatchesException(ValueError)))


class TestExtendedToOriginalAddFailure(
    TestExtendedToOriginalAddError):

    outcome = 'addFailure'


class TestExtendedToOriginalAddExpectedFailure(
    TestExtendedToOriginalAddError):

    outcome = 'addExpectedFailure'

    def test_outcome_Original_py26(self):
        self.make_26_result()
        self.check_outcome_exc_info_to_nothing(self.outcome, 'addSuccess')

    def test_outcome_Extended_py26(self):
        self.make_26_result()
        self.check_outcome_details_to_nothing(self.outcome, 'addSuccess')



class TestExtendedToOriginalAddSkip(
    TestExtendedToOriginalResultDecoratorBase):

    outcome = 'addSkip'

    def test_outcome_Original_py26(self):
        self.make_26_result()
        self.check_outcome_string_nothing(self.outcome, 'addSuccess')

    def test_outcome_Original_py27(self):
        self.make_27_result()
        self.check_outcome_string(self.outcome)

    def test_outcome_Original_pyextended(self):
        self.make_extended_result()
        self.check_outcome_string(self.outcome)

    def test_outcome_Extended_py26(self):
        self.make_26_result()
        self.check_outcome_string_nothing(self.outcome, 'addSuccess')

    def test_outcome_Extended_py27_no_reason(self):
        self.make_27_result()
        self.check_outcome_details_to_string(self.outcome)

    def test_outcome_Extended_py27_reason(self):
        self.make_27_result()
        self.check_outcome_details_to_arg(self.outcome, 'foo',
            {'reason': Content(UTF8_TEXT, lambda:[_b('foo')])})

    def test_outcome_Extended_pyextended(self):
        self.make_extended_result()
        self.check_outcome_details(self.outcome)

    def test_outcome__no_details(self):
        self.make_extended_result()
        self.assertThat(
            lambda: getattr(self.converter, self.outcome)(self),
            Raises(MatchesException(ValueError)))


class TestExtendedToOriginalAddSuccess(
    TestExtendedToOriginalResultDecoratorBase):

    outcome = 'addSuccess'
    expected = 'addSuccess'

    def test_outcome_Original_py26(self):
        self.make_26_result()
        self.check_outcome_nothing(self.outcome, self.expected)

    def test_outcome_Original_py27(self):
        self.make_27_result()
        self.check_outcome_nothing(self.outcome)

    def test_outcome_Original_pyextended(self):
        self.make_extended_result()
        self.check_outcome_nothing(self.outcome)

    def test_outcome_Extended_py26(self):
        self.make_26_result()
        self.check_outcome_details_to_nothing(self.outcome, self.expected)

    def test_outcome_Extended_py27(self):
        self.make_27_result()
        self.check_outcome_details_to_nothing(self.outcome)

    def test_outcome_Extended_pyextended(self):
        self.make_extended_result()
        self.check_outcome_details(self.outcome)


class TestExtendedToOriginalAddUnexpectedSuccess(
    TestExtendedToOriginalResultDecoratorBase):

    outcome = 'addUnexpectedSuccess'
    expected = 'addFailure'

    def test_outcome_Original_py26(self):
        self.make_26_result()
        getattr(self.converter, self.outcome)(self)
        [event] = self.result._events
        self.assertEqual((self.expected, self), event[:2])

    def test_outcome_Original_py27(self):
        self.make_27_result()
        self.check_outcome_nothing(self.outcome)

    def test_outcome_Original_pyextended(self):
        self.make_extended_result()
        self.check_outcome_nothing(self.outcome)

    def test_outcome_Extended_py26(self):
        self.make_26_result()
        getattr(self.converter, self.outcome)(self)
        [event] = self.result._events
        self.assertEqual((self.expected, self), event[:2])

    def test_outcome_Extended_py27(self):
        self.make_27_result()
        self.check_outcome_details_to_nothing(self.outcome)

    def test_outcome_Extended_pyextended(self):
        self.make_extended_result()
        self.check_outcome_details(self.outcome)


class TestExtendedToOriginalResultOtherAttributes(
    TestExtendedToOriginalResultDecoratorBase):

    def test_other_attribute(self):
        class OtherExtendedResult:
            def foo(self):
                return 2
            bar = 1
        self.result = OtherExtendedResult()
        self.make_converter()
        self.assertEqual(1, self.converter.bar)
        self.assertEqual(2, self.converter.foo())


class TestNonAsciiResults(TestCase):
    """Test all kinds of tracebacks are cleanly interpreted as unicode

    Currently only uses weak "contains" assertions, would be good to be much
    stricter about the expected output. This would add a few failures for the
    current release of IronPython for instance, which gets some traceback
    lines muddled.
    """

    _sample_texts = (
        _u("pa\u026a\u03b8\u0259n"), # Unicode encodings only
        _u("\u5357\u7121"), # In ISO 2022 encodings
        _u("\xa7\xa7\xa7"), # In ISO 8859 encodings
        )

    _is_pypy = "__pypy__" in sys.builtin_module_names
    # Everything but Jython shows syntax errors on the current character
    _error_on_character = os.name != "java" and not _is_pypy

    def _run(self, stream, test):
        """Run the test, the same as in testtools.run but not to stdout"""
        result = TextTestResult(stream)
        result.startTestRun()
        try:
            return test.run(result)
        finally:
            result.stopTestRun()

    def _write_module(self, name, encoding, contents):
        """Create Python module on disk with contents in given encoding"""
        try:
            # Need to pre-check that the coding is valid or codecs.open drops
            # the file without closing it which breaks non-refcounted pythons
            codecs.lookup(encoding)
        except LookupError:
            self.skip("Encoding unsupported by implementation: %r" % encoding)
        f = codecs.open(os.path.join(self.dir, name + ".py"), "w", encoding)
        try:
            f.write(contents)
        finally:
            f.close()

    def _test_external_case(self, testline, coding="ascii", modulelevel="",
            suffix=""):
        """Create and run a test case in a seperate module"""
        self._setup_external_case(testline, coding, modulelevel, suffix)
        return self._run_external_case()

    def _setup_external_case(self, testline, coding="ascii", modulelevel="",
            suffix=""):
        """Create a test case in a seperate module"""
        _, prefix, self.modname = self.id().rsplit(".", 2)
        self.dir = tempfile.mkdtemp(prefix=prefix, suffix=suffix)
        self.addCleanup(shutil.rmtree, self.dir)
        self._write_module(self.modname, coding,
            # Older Python 2 versions don't see a coding declaration in a
            # docstring so it has to be in a comment, but then we can't
            # workaround bug: <http://ironpython.codeplex.com/workitem/26940>
            "# coding: %s\n"
            "import testtools\n"
            "%s\n"
            "class Test(testtools.TestCase):\n"
            "    def runTest(self):\n"
            "        %s\n" % (coding, modulelevel, testline))

    def _run_external_case(self):
        """Run the prepared test case in a seperate module"""
        sys.path.insert(0, self.dir)
        self.addCleanup(sys.path.remove, self.dir)
        module = __import__(self.modname)
        self.addCleanup(sys.modules.pop, self.modname)
        stream = StringIO()
        self._run(stream, module.Test())
        return stream.getvalue()

    def _get_sample_text(self, encoding="unicode_internal"):
        if encoding is None and str_is_unicode:
           encoding = "unicode_internal"
        for u in self._sample_texts:
            try:
                b = u.encode(encoding)
                if u == b.decode(encoding):
                   if str_is_unicode:
                       return u, u
                   return u, b
            except (LookupError, UnicodeError):
                pass
        self.skip("Could not find a sample text for encoding: %r" % encoding)

    def _as_output(self, text):
        return text

    def test_non_ascii_failure_string(self):
        """Assertion contents can be non-ascii and should get decoded"""
        text, raw = self._get_sample_text(_get_exception_encoding())
        textoutput = self._test_external_case("self.fail(%s)" % _r(raw))
        self.assertIn(self._as_output(text), textoutput)

    def test_non_ascii_failure_string_via_exec(self):
        """Assertion via exec can be non-ascii and still gets decoded"""
        text, raw = self._get_sample_text(_get_exception_encoding())
        textoutput = self._test_external_case(
            testline='exec ("self.fail(%s)")' % _r(raw))
        self.assertIn(self._as_output(text), textoutput)

    def test_control_characters_in_failure_string(self):
        """Control characters in assertions should be escaped"""
        textoutput = self._test_external_case("self.fail('\\a\\a\\a')")
        self.expectFailure("Defense against the beeping horror unimplemented",
            self.assertNotIn, self._as_output("\a\a\a"), textoutput)
        self.assertIn(self._as_output(_u("\uFFFD\uFFFD\uFFFD")), textoutput)

    def _local_os_error_matcher(self):
        if sys.version_info > (3, 3):
            return MatchesAny(Contains("FileExistsError: "),
                              Contains("PermissionError: "))
        elif os.name != "nt":
            return Contains(self._as_output("OSError: "))
        else:
            return Contains(self._as_output("WindowsError: "))

    def test_os_error(self):
        """Locale error messages from the OS shouldn't break anything"""
        textoutput = self._test_external_case(
            modulelevel="import os",
            testline="os.mkdir('/')")
        self.assertThat(textoutput, self._local_os_error_matcher())

    def test_assertion_text_shift_jis(self):
        """A terminal raw backslash in an encoded string is weird but fine"""
        example_text = _u("\u5341")
        textoutput = self._test_external_case(
            coding="shift_jis",
            testline="self.fail('%s')" % example_text)
        if str_is_unicode:
            output_text = example_text
        else:
            output_text = example_text.encode("shift_jis").decode(
                _get_exception_encoding(), "replace")
        self.assertIn(self._as_output("AssertionError: %s" % output_text),
            textoutput)

    def test_file_comment_iso2022_jp(self):
        """Control character escapes must be preserved if valid encoding"""
        example_text, _ = self._get_sample_text("iso2022_jp")
        textoutput = self._test_external_case(
            coding="iso2022_jp",
            testline="self.fail('Simple') # %s" % example_text)
        self.assertIn(self._as_output(example_text), textoutput)

    def test_unicode_exception(self):
        """Exceptions that can be formated losslessly as unicode should be"""
        example_text, _ = self._get_sample_text()
        exception_class = (
            "class FancyError(Exception):\n"
            # A __unicode__ method does nothing on py3k but the default works
            "    def __unicode__(self):\n"
            "        return self.args[0]\n")
        textoutput = self._test_external_case(
            modulelevel=exception_class,
            testline="raise FancyError(%s)" % _r(example_text))
        self.assertIn(self._as_output(example_text), textoutput)

    def test_unprintable_exception(self):
        """A totally useless exception instance still prints something"""
        exception_class = (
            "class UnprintableError(Exception):\n"
            "    def __str__(self):\n"
            "        raise RuntimeError\n"
            "    def __unicode__(self):\n"
            "        raise RuntimeError\n"
            "    def __repr__(self):\n"
            "        raise RuntimeError\n")
        textoutput = self._test_external_case(
            modulelevel=exception_class,
            testline="raise UnprintableError")
        self.assertIn(self._as_output(
            "UnprintableError: <unprintable UnprintableError object>\n"),
            textoutput)

    def test_non_ascii_dirname(self):
        """Script paths in the traceback can be non-ascii"""
        text, raw = self._get_sample_text(sys.getfilesystemencoding())
        textoutput = self._test_external_case(
            # Avoid bug in Python 3 by giving a unicode source encoding rather
            # than just ascii which raises a SyntaxError with no other details
            coding="utf-8",
            testline="self.fail('Simple')",
            suffix=raw)
        self.assertIn(self._as_output(text), textoutput)

    def test_syntax_error(self):
        """Syntax errors should still have fancy special-case formatting"""
        textoutput = self._test_external_case("exec ('f(a, b c)')")
        self.assertIn(self._as_output(
            '  File "<string>", line 1\n'
            '    f(a, b c)\n'
            + ' ' * self._error_on_character +
            '          ^\n'
            'SyntaxError: '
            ), textoutput)

    def test_syntax_error_malformed(self):
        """Syntax errors with bogus parameters should break anything"""
        textoutput = self._test_external_case("raise SyntaxError(3, 2, 1)")
        self.assertIn(self._as_output("\nSyntaxError: "), textoutput)

    def test_syntax_error_import_binary(self):
        """Importing a binary file shouldn't break SyntaxError formatting"""
        self._setup_external_case("import bad")
        f = open(os.path.join(self.dir, "bad.py"), "wb")
        try:
            f.write(_b("x\x9c\xcb*\xcd\xcb\x06\x00\x04R\x01\xb9"))
        finally:
            f.close()
        textoutput = self._run_external_case()
        matches_error = MatchesAny(
            Contains('\nTypeError: '), Contains('\nSyntaxError: '))
        self.assertThat(textoutput, matches_error)

    def test_syntax_error_line_iso_8859_1(self):
        """Syntax error on a latin-1 line shows the line decoded"""
        text, raw = self._get_sample_text("iso-8859-1")
        textoutput = self._setup_external_case("import bad")
        self._write_module("bad", "iso-8859-1",
            "# coding: iso-8859-1\n! = 0 # %s\n" % text)
        textoutput = self._run_external_case()
        self.assertIn(self._as_output(_u(
            #'bad.py", line 2\n'
            '    ! = 0 # %s\n'
            '    ^\n'
            'SyntaxError: ') %
            (text,)), textoutput)

    def test_syntax_error_line_iso_8859_5(self):
        """Syntax error on a iso-8859-5 line shows the line decoded"""
        text, raw = self._get_sample_text("iso-8859-5")
        textoutput = self._setup_external_case("import bad")
        self._write_module("bad", "iso-8859-5",
            "# coding: iso-8859-5\n%% = 0 # %s\n" % text)
        textoutput = self._run_external_case()
        self.assertIn(self._as_output(_u(
            #'bad.py", line 2\n'
            '    %% = 0 # %s\n'
            + ' ' * self._error_on_character +
            '   ^\n'
            'SyntaxError: ') %
            (text,)), textoutput)

    def test_syntax_error_line_euc_jp(self):
        """Syntax error on a euc_jp line shows the line decoded"""
        text, raw = self._get_sample_text("euc_jp")
        textoutput = self._setup_external_case("import bad")
        self._write_module("bad", "euc_jp",
            "# coding: euc_jp\n$ = 0 # %s\n" % text)
        textoutput = self._run_external_case()
        # pypy uses cpython's multibyte codecs so has their behavior here
        if self._is_pypy:
            self._error_on_character = True
        self.assertIn(self._as_output(_u(
            #'bad.py", line 2\n'
            '    $ = 0 # %s\n'
            + ' ' * self._error_on_character +
            '   ^\n'
            'SyntaxError: ') %
            (text,)), textoutput)

    def test_syntax_error_line_utf_8(self):
        """Syntax error on a utf-8 line shows the line decoded"""
        text, raw = self._get_sample_text("utf-8")
        textoutput = self._setup_external_case("import bad")
        self._write_module("bad", "utf-8", _u("\ufeff^ = 0 # %s\n") % text)
        textoutput = self._run_external_case()
        self.assertIn(self._as_output(_u(
            'bad.py", line 1\n'
            '    ^ = 0 # %s\n'
            + ' ' * self._error_on_character +
            '   ^\n'
            'SyntaxError: ') %
            text), textoutput)


class TestNonAsciiResultsWithUnittest(TestNonAsciiResults):
    """Test that running under unittest produces clean ascii strings"""

    def _run(self, stream, test):
        from unittest import TextTestRunner as _Runner
        return _Runner(stream).run(test)

    def _as_output(self, text):
        if str_is_unicode:
            return text
        return text.encode("utf-8")


class TestDetailsToStr(TestCase):

    def test_no_details(self):
        string = _details_to_str({})
        self.assertThat(string, Equals(''))

    def test_binary_content(self):
        content = content_from_stream(
            StringIO('foo'), content_type=ContentType('image', 'jpeg'))
        string = _details_to_str({'attachment': content})
        self.assertThat(
            string, Equals("""\
Binary content:
  attachment (image/jpeg)
"""))

    def test_single_line_content(self):
        content = text_content('foo')
        string = _details_to_str({'attachment': content})
        self.assertThat(string, Equals('attachment: {{{foo}}}\n'))

    def test_multi_line_text_content(self):
        content = text_content('foo\nbar\nbaz')
        string = _details_to_str({'attachment': content})
        self.assertThat(string, Equals('attachment: {{{\nfoo\nbar\nbaz\n}}}\n'))

    def test_special_text_content(self):
        content = text_content('foo')
        string = _details_to_str({'attachment': content}, special='attachment')
        self.assertThat(string, Equals('foo\n'))

    def test_multiple_text_content(self):
        string = _details_to_str(
            {'attachment': text_content('foo\nfoo'),
             'attachment-1': text_content('bar\nbar')})
        self.assertThat(
            string, Equals('attachment: {{{\n'
                           'foo\n'
                           'foo\n'
                           '}}}\n'
                           '\n'
                           'attachment-1: {{{\n'
                           'bar\n'
                           'bar\n'
                           '}}}\n'))

    def test_empty_attachment(self):
        string = _details_to_str({'attachment': text_content('')})
        self.assertThat(
            string, Equals("""\
Empty attachments:
  attachment
"""))

    def test_lots_of_different_attachments(self):
        jpg = lambda x: content_from_stream(
            StringIO(x), ContentType('image', 'jpeg'))
        attachments = {
            'attachment': text_content('foo'),
            'attachment-1': text_content('traceback'),
            'attachment-2': jpg('pic1'),
            'attachment-3': text_content('bar'),
            'attachment-4': text_content(''),
            'attachment-5': jpg('pic2'),
            }
        string = _details_to_str(attachments, special='attachment-1')
        self.assertThat(
            string, Equals("""\
Binary content:
  attachment-2 (image/jpeg)
  attachment-5 (image/jpeg)
Empty attachments:
  attachment-4

attachment: {{{foo}}}
attachment-3: {{{bar}}}

traceback
"""))


class TestByTestResultTests(TestCase):

    def setUp(self):
        super(TestByTestResultTests, self).setUp()
        self.log = []
        self.result = TestByTestResult(self.on_test)
        now = iter(range(5))
        self.result._now = lambda: advance_iterator(now)

    def assertCalled(self, **kwargs):
        defaults = {
            'test': self,
            'tags': set(),
            'details': None,
            'start_time': 0,
            'stop_time': 1,
            }
        defaults.update(kwargs)
        self.assertEqual([defaults], self.log)

    def on_test(self, **kwargs):
        self.log.append(kwargs)

    def test_no_tests_nothing_reported(self):
        self.result.startTestRun()
        self.result.stopTestRun()
        self.assertEqual([], self.log)

    def test_add_success(self):
        self.result.startTest(self)
        self.result.addSuccess(self)
        self.result.stopTest(self)
        self.assertCalled(status='success')

    def test_add_success_details(self):
        self.result.startTest(self)
        details = {'foo': 'bar'}
        self.result.addSuccess(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='success', details=details)

    def test_global_tags(self):
        self.result.tags(['foo'], [])
        self.result.startTest(self)
        self.result.addSuccess(self)
        self.result.stopTest(self)
        self.assertCalled(status='success', tags=set(['foo']))

    def test_local_tags(self):
        self.result.tags(['foo'], [])
        self.result.startTest(self)
        self.result.tags(['bar'], [])
        self.result.addSuccess(self)
        self.result.stopTest(self)
        self.assertCalled(status='success', tags=set(['foo', 'bar']))

    def test_add_error(self):
        self.result.startTest(self)
        try:
            1/0
        except ZeroDivisionError:
            error = sys.exc_info()
        self.result.addError(self, error)
        self.result.stopTest(self)
        self.assertCalled(
            status='error',
            details={'traceback': TracebackContent(error, self)})

    def test_add_error_details(self):
        self.result.startTest(self)
        details = {"foo": text_content("bar")}
        self.result.addError(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='error', details=details)

    def test_add_failure(self):
        self.result.startTest(self)
        try:
            self.fail("intentional failure")
        except self.failureException:
            failure = sys.exc_info()
        self.result.addFailure(self, failure)
        self.result.stopTest(self)
        self.assertCalled(
            status='failure',
            details={'traceback': TracebackContent(failure, self)})

    def test_add_failure_details(self):
        self.result.startTest(self)
        details = {"foo": text_content("bar")}
        self.result.addFailure(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='failure', details=details)

    def test_add_xfail(self):
        self.result.startTest(self)
        try:
            1/0
        except ZeroDivisionError:
            error = sys.exc_info()
        self.result.addExpectedFailure(self, error)
        self.result.stopTest(self)
        self.assertCalled(
            status='xfail',
            details={'traceback': TracebackContent(error, self)})

    def test_add_xfail_details(self):
        self.result.startTest(self)
        details = {"foo": text_content("bar")}
        self.result.addExpectedFailure(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='xfail', details=details)

    def test_add_unexpected_success(self):
        self.result.startTest(self)
        details = {'foo': 'bar'}
        self.result.addUnexpectedSuccess(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='success', details=details)

    def test_add_skip_reason(self):
        self.result.startTest(self)
        reason = self.getUniqueString()
        self.result.addSkip(self, reason)
        self.result.stopTest(self)
        self.assertCalled(
            status='skip', details={'reason': text_content(reason)})

    def test_add_skip_details(self):
        self.result.startTest(self)
        details = {'foo': 'bar'}
        self.result.addSkip(self, details=details)
        self.result.stopTest(self)
        self.assertCalled(status='skip', details=details)

    def test_twice(self):
        self.result.startTest(self)
        self.result.addSuccess(self, details={'foo': 'bar'})
        self.result.stopTest(self)
        self.result.startTest(self)
        self.result.addSuccess(self)
        self.result.stopTest(self)
        self.assertEqual(
            [{'test': self,
              'status': 'success',
              'start_time': 0,
              'stop_time': 1,
              'tags': set(),
              'details': {'foo': 'bar'}},
             {'test': self,
              'status': 'success',
              'start_time': 2,
              'stop_time': 3,
              'tags': set(),
              'details': None},
             ],
            self.log)


class TestTagger(TestCase):

    def test_tags_tests(self):
        result = ExtendedTestResult()
        tagger = Tagger(result, set(['foo']), set(['bar']))
        test1, test2 = self, make_test()
        tagger.startTest(test1)
        tagger.addSuccess(test1)
        tagger.stopTest(test1)
        tagger.startTest(test2)
        tagger.addSuccess(test2)
        tagger.stopTest(test2)
        self.assertEqual(
            [('startTest', test1),
             ('tags', set(['foo']), set(['bar'])),
             ('addSuccess', test1),
             ('stopTest', test1),
             ('startTest', test2),
             ('tags', set(['foo']), set(['bar'])),
             ('addSuccess', test2),
             ('stopTest', test2),
             ], result._events)


class TestTimestampingStreamResult(TestCase):

    def test_startTestRun(self):
        result = TimestampingStreamResult(LoggingStreamResult())
        result.startTestRun()
        self.assertEqual([('startTestRun',)], result.targets[0]._events)

    def test_stopTestRun(self):
        result = TimestampingStreamResult(LoggingStreamResult())
        result.stopTestRun()
        self.assertEqual([('stopTestRun',)], result.targets[0]._events)

    def test_status_no_timestamp(self):
        result = TimestampingStreamResult(LoggingStreamResult())
        result.status(test_id="A", test_status="B", test_tags="C",
            runnable="D", file_name="E", file_bytes=b"F", eof=True,
            mime_type="G", route_code="H")
        events = result.targets[0]._events
        self.assertThat(events, HasLength(1))
        self.assertThat(events[0], HasLength(11))
        self.assertEqual(
            ("status", "A", "B", "C", "D", "E", b"F", True, "G", "H"),
            events[0][:10])
        self.assertNotEqual(None, events[0][10])
        self.assertIsInstance(events[0][10], datetime.datetime)

    def test_status_timestamp(self):
        result = TimestampingStreamResult(LoggingStreamResult())
        result.status(timestamp="F")
        self.assertEqual("F", result.targets[0]._events[0][10])


def test_suite():
    from unittest import TestLoader
    return TestLoader().loadTestsFromName(__name__)