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# Copyright (c) 2004 Canonical Limited
# Author: Robert Collins <robert.collins@canonical.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import sys
import logging
import unittest
class LogCollector(logging.Handler):
def __init__(self):
logging.Handler.__init__(self)
self.records=[]
def emit(self, record):
self.records.append(record.getMessage())
def makeCollectingLogger():
"""I make a logger instance that collects its logs for programmatic analysis
-> (logger, collector)"""
logger=logging.Logger("collector")
handler=LogCollector()
handler.setFormatter(logging.Formatter("%(levelname)s: %(message)s"))
logger.addHandler(handler)
return logger, handler
def visitTests(suite, visitor):
"""A foreign method for visiting the tests in a test suite."""
for test in suite._tests:
#Abusing types to avoid monkey patching unittest.TestCase.
# Maybe that would be better?
try:
test.visit(visitor)
except AttributeError:
if isinstance(test, unittest.TestCase):
visitor.visitCase(test)
elif isinstance(test, unittest.TestSuite):
visitor.visitSuite(test)
visitTests(test, visitor)
else:
print "unvisitable non-unittest.TestCase element %r (%r)" % (test, test.__class__)
class TestSuite(unittest.TestSuite):
"""I am an extended TestSuite with a visitor interface.
This is primarily to allow filtering of tests - and suites or
more in the future. An iterator of just tests wouldn't scale..."""
def visit(self, visitor):
"""visit the composite. Visiting is depth-first.
current callbacks are visitSuite and visitCase."""
visitor.visitSuite(self)
visitTests(self, visitor)
class TestLoader(unittest.TestLoader):
"""Custom TestLoader to address some quirks in the stock python one."""
suiteClass = TestSuite
def loadTestsFromModuleNames(self, names):
"""use a custom means to load tests from modules.
There is an undesirable glitch in the python TestLoader where a
import error is ignore. We think this can be solved by ensuring the
requested name is resolvable, if its not raising the original error.
"""
result = self.suiteClass()
for name in names:
_load_module_by_name(name)
result.addTests(self.loadTestsFromName(name))
return result
def _load_module_by_name(mod_name):
parts = mod_name.split('.')
module = __import__(mod_name)
del parts[0]
# for historical reasons python returns the top-level module even though
# it loads the submodule; we need to walk down to get the one we want.
while parts:
module = getattr(module, parts.pop(0))
return module
class TestVisitor(object):
"""A visitor for Tests"""
def visitSuite(self, aTestSuite):
pass
def visitCase(self, aTestCase):
pass
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