--- /dev/null
+# Copyright (c) 2008, 2009 Jonathan M. Lange. See LICENSE for details.
+
+"""Test case related stuff."""
+
+__metaclass__ = type
+__all__ = [
+ 'clone_test_with_new_id',
+ 'TestCase',
+ 'skip',
+ 'skipIf',
+ 'skipUnless',
+ ]
+
+import copy
+try:
+ from functools import wraps
+except ImportError:
+ wraps = None
+import itertools
+import sys
+import types
+import unittest
+
+from testtools import content
+from testtools.runtest import RunTest
+from testtools.testresult import TestResult
+from testtools.utils import advance_iterator
+
+
+try:
+ # Try to use the python2.7 SkipTest exception for signalling skips.
+ from unittest.case import SkipTest as TestSkipped
+except ImportError:
+ class TestSkipped(Exception):
+ """Raised within TestCase.run() when a test is skipped."""
+
+
+try:
+ # Try to use the same exceptions python 2.7 does.
+ from unittest.case import _ExpectedFailure, _UnexpectedSuccess
+except ImportError:
+ # Oops, not available, make our own.
+ class _UnexpectedSuccess(Exception):
+ """An unexpected success was raised.
+
+ Note that this exception is private plumbing in testtools' testcase
+ module.
+ """
+
+ class _ExpectedFailure(Exception):
+ """An expected failure occured.
+
+ Note that this exception is private plumbing in testtools' testcase
+ module.
+ """
+
+
+class TestCase(unittest.TestCase):
+ """Extensions to the basic TestCase.
+
+ :ivar exception_handlers: Exceptions to catch from setUp, runTest and
+ tearDown. This list is able to be modified at any time and consists of
+ (exception_class, handler(case, result, exception_value)) pairs.
+ """
+
+ skipException = TestSkipped
+
+ def __init__(self, *args, **kwargs):
+ """Construct a TestCase.
+
+ :param testMethod: The name of the method to run.
+ :param runTest: Optional class to use to execute the test. If not
+ supplied testtools.runtest.RunTest is used. The instance to be
+ used is created when run() is invoked, so will be fresh each time.
+ """
+ unittest.TestCase.__init__(self, *args, **kwargs)
+ self._cleanups = []
+ self._unique_id_gen = itertools.count(1)
+ self.__setup_called = False
+ self.__teardown_called = False
+ self.__details = {}
+ self.__RunTest = kwargs.get('runTest', RunTest)
+ self.__exception_handlers = []
+ self.exception_handlers = [
+ (self.skipException, self._report_skip),
+ (self.failureException, self._report_failure),
+ (_ExpectedFailure, self._report_expected_failure),
+ (_UnexpectedSuccess, self._report_unexpected_success),
+ (Exception, self._report_error),
+ ]
+
+ def __eq__(self, other):
+ eq = getattr(unittest.TestCase, '__eq__', None)
+ if eq is not None and not unittest.TestCase.__eq__(self, other):
+ return False
+ return self.__dict__ == other.__dict__
+
+ def __repr__(self):
+ # We add id to the repr because it makes testing testtools easier.
+ return "<%s id=0x%0x>" % (self.id(), id(self))
+
+ def addDetail(self, name, content_object):
+ """Add a detail to be reported with this test's outcome.
+
+ For more details see pydoc testtools.TestResult.
+
+ :param name: The name to give this detail.
+ :param content_object: The content object for this detail. See
+ testtools.content for more detail.
+ """
+ self.__details[name] = content_object
+
+ def getDetails(self):
+ """Get the details dict that will be reported with this test's outcome.
+
+ For more details see pydoc testtools.TestResult.
+ """
+ return self.__details
+
+ def shortDescription(self):
+ return self.id()
+
+ def skip(self, reason):
+ """Cause this test to be skipped.
+
+ This raises self.skipException(reason). skipException is raised
+ to permit a skip to be triggered at any point (during setUp or the
+ testMethod itself). The run() method catches skipException and
+ translates that into a call to the result objects addSkip method.
+
+ :param reason: The reason why the test is being skipped. This must
+ support being cast into a unicode string for reporting.
+ """
+ raise self.skipException(reason)
+
+ def _formatTypes(self, classOrIterable):
+ """Format a class or a bunch of classes for display in an error."""
+ className = getattr(classOrIterable, '__name__', None)
+ if className is None:
+ className = ', '.join(klass.__name__ for klass in classOrIterable)
+ return className
+
+ def _runCleanups(self, result):
+ """Run the cleanups that have been added with addCleanup.
+
+ See the docstring for addCleanup for more information.
+
+ Returns True if all cleanups ran without error, False otherwise.
+ """
+ ok = True
+ while self._cleanups:
+ function, arguments, keywordArguments = self._cleanups.pop()
+ try:
+ function(*arguments, **keywordArguments)
+ except KeyboardInterrupt:
+ raise
+ except:
+ self._report_error(self, result, None)
+ ok = False
+ return ok
+
+ def addCleanup(self, function, *arguments, **keywordArguments):
+ """Add a cleanup function to be called after tearDown.
+
+ Functions added with addCleanup will be called in reverse order of
+ adding after the test method and before tearDown.
+
+ If a function added with addCleanup raises an exception, the error
+ will be recorded as a test error, and the next cleanup will then be
+ run.
+
+ Cleanup functions are always called before a test finishes running,
+ even if setUp is aborted by an exception.
+ """
+ self._cleanups.append((function, arguments, keywordArguments))
+
+ def addOnException(self, handler):
+ """Add a handler to be called when an exception occurs in test code.
+
+ This handler cannot affect what result methods are called, and is
+ called before any outcome is called on the result object. An example
+ use for it is to add some diagnostic state to the test details dict
+ which is expensive to calculate and not interesting for reporting in
+ the success case.
+
+ Handlers are called before the outcome (such as addFailure) that
+ the exception has caused.
+
+ Handlers are called in first-added, first-called order, and if they
+ raise an exception, that will propogate out of the test running
+ machinery, halting test processing. As a result, do not call code that
+ may unreasonably fail.
+ """
+ self.__exception_handlers.append(handler)
+
+ def _add_reason(self, reason):
+ self.addDetail('reason', content.Content(
+ content.ContentType('text', 'plain'),
+ lambda: [reason.encode('utf8')]))
+
+ def assertIn(self, needle, haystack):
+ """Assert that needle is in haystack."""
+ self.assertTrue(
+ needle in haystack, '%r not in %r' % (needle, haystack))
+
+ def assertIs(self, expected, observed):
+ """Assert that `expected` is `observed`."""
+ self.assertTrue(
+ expected is observed, '%r is not %r' % (expected, observed))
+
+ def assertIsNot(self, expected, observed):
+ """Assert that `expected` is not `observed`."""
+ self.assertTrue(
+ expected is not observed, '%r is %r' % (expected, observed))
+
+ def assertNotIn(self, needle, haystack):
+ """Assert that needle is not in haystack."""
+ self.assertTrue(
+ needle not in haystack, '%r in %r' % (needle, haystack))
+
+ def assertIsInstance(self, obj, klass):
+ self.assertTrue(
+ isinstance(obj, klass),
+ '%r is not an instance of %s' % (obj, self._formatTypes(klass)))
+
+ def assertRaises(self, excClass, callableObj, *args, **kwargs):
+ """Fail unless an exception of class excClass is thrown
+ by callableObj when invoked with arguments args and keyword
+ arguments kwargs. If a different type of exception is
+ thrown, it will not be caught, and the test case will be
+ deemed to have suffered an error, exactly as for an
+ unexpected exception.
+ """
+ try:
+ ret = callableObj(*args, **kwargs)
+ except excClass:
+ return sys.exc_info()[1]
+ else:
+ excName = self._formatTypes(excClass)
+ self.fail("%s not raised, %r returned instead." % (excName, ret))
+ failUnlessRaises = assertRaises
+
+ def assertThat(self, matchee, matcher):
+ """Assert that matchee is matched by matcher.
+
+ :param matchee: An object to match with matcher.
+ :param matcher: An object meeting the testtools.Matcher protocol.
+ :raises self.failureException: When matcher does not match thing.
+ """
+ mismatch = matcher.match(matchee)
+ if not mismatch:
+ return
+ self.fail('Match failed. Matchee: "%s"\nMatcher: %s\nDifference: %s\n'
+ % (matchee, matcher, mismatch.describe()))
+
+ def defaultTestResult(self):
+ return TestResult()
+
+ def expectFailure(self, reason, predicate, *args, **kwargs):
+ """Check that a test fails in a particular way.
+
+ If the test fails in the expected way, a KnownFailure is caused. If it
+ succeeds an UnexpectedSuccess is caused.
+
+ The expected use of expectFailure is as a barrier at the point in a
+ test where the test would fail. For example:
+ >>> def test_foo(self):
+ >>> self.expectFailure("1 should be 0", self.assertNotEqual, 1, 0)
+ >>> self.assertEqual(1, 0)
+
+ If in the future 1 were to equal 0, the expectFailure call can simply
+ be removed. This separation preserves the original intent of the test
+ while it is in the expectFailure mode.
+ """
+ self._add_reason(reason)
+ try:
+ predicate(*args, **kwargs)
+ except self.failureException:
+ exc_info = sys.exc_info()
+ self.addDetail('traceback',
+ content.TracebackContent(exc_info, self))
+ raise _ExpectedFailure(exc_info)
+ else:
+ raise _UnexpectedSuccess(reason)
+
+ def getUniqueInteger(self):
+ """Get an integer unique to this test.
+
+ Returns an integer that is guaranteed to be unique to this instance.
+ Use this when you need an arbitrary integer in your test, or as a
+ helper for custom anonymous factory methods.
+ """
+ return advance_iterator(self._unique_id_gen)
+
+ def getUniqueString(self, prefix=None):
+ """Get a string unique to this test.
+
+ Returns a string that is guaranteed to be unique to this instance. Use
+ this when you need an arbitrary string in your test, or as a helper
+ for custom anonymous factory methods.
+
+ :param prefix: The prefix of the string. If not provided, defaults
+ to the id of the tests.
+ :return: A bytestring of '<prefix>-<unique_int>'.
+ """
+ if prefix is None:
+ prefix = self.id()
+ return '%s-%d' % (prefix, self.getUniqueInteger())
+
+ def onException(self, exc_info):
+ """Called when an exception propogates from test code.
+
+ :seealso addOnException:
+ """
+ for handler in self.__exception_handlers:
+ handler(exc_info)
+
+ @staticmethod
+ def _report_error(self, result, err):
+ self._report_traceback()
+ result.addError(self, details=self.getDetails())
+
+ @staticmethod
+ def _report_expected_failure(self, result, err):
+ result.addExpectedFailure(self, details=self.getDetails())
+
+ @staticmethod
+ def _report_failure(self, result, err):
+ self._report_traceback()
+ result.addFailure(self, details=self.getDetails())
+
+ @staticmethod
+ def _report_skip(self, result, err):
+ if err.args:
+ reason = err.args[0]
+ else:
+ reason = "no reason given."
+ self._add_reason(reason)
+ result.addSkip(self, details=self.getDetails())
+
+ def _report_traceback(self):
+ self.addDetail('traceback',
+ content.TracebackContent(sys.exc_info(), self))
+
+ @staticmethod
+ def _report_unexpected_success(self, result, err):
+ result.addUnexpectedSuccess(self, details=self.getDetails())
+
+ def run(self, result=None):
+ return self.__RunTest(self, self.exception_handlers).run(result)
+
+ def _run_setup(self, result):
+ """Run the setUp function for this test.
+
+ :param result: A testtools.TestResult to report activity to.
+ :raises ValueError: If the base class setUp is not called, a
+ ValueError is raised.
+ """
+ self.setUp()
+ if not self.__setup_called:
+ raise ValueError("setUp was not called")
+
+ def _run_teardown(self, result):
+ """Run the tearDown function for this test.
+
+ :param result: A testtools.TestResult to report activity to.
+ :raises ValueError: If the base class tearDown is not called, a
+ ValueError is raised.
+ """
+ self.tearDown()
+ if not self.__teardown_called:
+ raise ValueError("teardown was not called")
+
+ def _run_test_method(self, result):
+ """Run the test method for this test.
+
+ :param result: A testtools.TestResult to report activity to.
+ :return: None.
+ """
+ absent_attr = object()
+ # Python 2.5+
+ method_name = getattr(self, '_testMethodName', absent_attr)
+ if method_name is absent_attr:
+ # Python 2.4
+ method_name = getattr(self, '_TestCase__testMethodName')
+ testMethod = getattr(self, method_name)
+ testMethod()
+
+ def setUp(self):
+ unittest.TestCase.setUp(self)
+ self.__setup_called = True
+
+ def tearDown(self):
+ unittest.TestCase.tearDown(self)
+ self.__teardown_called = True
+
+
+# Python 2.4 did not know how to deep copy functions.
+if types.FunctionType not in copy._deepcopy_dispatch:
+ copy._deepcopy_dispatch[types.FunctionType] = copy._deepcopy_atomic
+
+
+def clone_test_with_new_id(test, new_id):
+ """Copy a TestCase, and give the copied test a new id."""
+ newTest = copy.deepcopy(test)
+ newTest.id = lambda: new_id
+ return newTest
+
+
+def skip(reason):
+ """A decorator to skip unit tests.
+
+ This is just syntactic sugar so users don't have to change any of their
+ unit tests in order to migrate to python 2.7, which provides the
+ @unittest.skip decorator.
+ """
+ def decorator(test_item):
+ if wraps is not None:
+ @wraps(test_item)
+ def skip_wrapper(*args, **kwargs):
+ raise TestCase.skipException(reason)
+ else:
+ def skip_wrapper(test_item):
+ test_item.skip(reason)
+ return skip_wrapper
+ return decorator
+
+
+def skipIf(condition, reason):
+ """Skip a test if the condition is true."""
+ if condition:
+ return skip(reason)
+ def _id(obj):
+ return obj
+ return _id
+
+
+def skipUnless(condition, reason):
+ """Skip a test unless the condition is true."""
+ if not condition:
+ return skip(reason)
+ def _id(obj):
+ return obj
+ return _id
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