diff options
Diffstat (limited to 'Lib/unittest/case.py')
| -rw-r--r-- | Lib/unittest/case.py | 80 |
1 files changed, 47 insertions, 33 deletions
diff --git a/Lib/unittest/case.py b/Lib/unittest/case.py index 881de6f..5b7c29d 100644 --- a/Lib/unittest/case.py +++ b/Lib/unittest/case.py @@ -104,9 +104,9 @@ def expectedFailure(func): class _AssertRaisesBaseContext(object): def __init__(self, expected, test_case, callable_obj=None, - expected_regex=None): + expected_regex=None): self.expected = expected - self.failureException = test_case.failureException + self.test_case = test_case if callable_obj is not None: try: self.obj_name = callable_obj.__name__ @@ -117,6 +117,24 @@ class _AssertRaisesBaseContext(object): if isinstance(expected_regex, (bytes, str)): expected_regex = re.compile(expected_regex) self.expected_regex = expected_regex + self.msg = None + + def _raiseFailure(self, standardMsg): + msg = self.test_case._formatMessage(self.msg, standardMsg) + raise self.test_case.failureException(msg) + + def handle(self, name, callable_obj, args, kwargs): + """ + If callable_obj is None, assertRaises/Warns is being used as a + context manager, so check for a 'msg' kwarg and return self. + If callable_obj is not None, call it passing args and kwargs. + """ + if callable_obj is None: + self.msg = kwargs.pop('msg', None) + return self + with self: + callable_obj(*args, **kwargs) + class _AssertRaisesContext(_AssertRaisesBaseContext): @@ -132,11 +150,10 @@ class _AssertRaisesContext(_AssertRaisesBaseContext): except AttributeError: exc_name = str(self.expected) if self.obj_name: - raise self.failureException("{0} not raised by {1}" - .format(exc_name, self.obj_name)) + self._raiseFailure("{} not raised by {}".format(exc_name, + self.obj_name)) else: - raise self.failureException("{0} not raised" - .format(exc_name)) + self._raiseFailure("{} not raised".format(exc_name)) if not issubclass(exc_type, self.expected): # let unexpected exceptions pass through return False @@ -147,8 +164,8 @@ class _AssertRaisesContext(_AssertRaisesBaseContext): expected_regex = self.expected_regex if not expected_regex.search(str(exc_value)): - raise self.failureException('"%s" does not match "%s"' % - (expected_regex.pattern, str(exc_value))) + self._raiseFailure('"{}" does not match "{}"'.format( + expected_regex.pattern, str(exc_value))) return True @@ -192,14 +209,13 @@ class _AssertWarnsContext(_AssertRaisesBaseContext): return # Now we simply try to choose a helpful failure message if first_matching is not None: - raise self.failureException('"%s" does not match "%s"' % - (self.expected_regex.pattern, str(first_matching))) + self._raiseFailure('"{}" does not match "{}"'.format( + self.expected_regex.pattern, str(first_matching))) if self.obj_name: - raise self.failureException("{0} not triggered by {1}" - .format(exc_name, self.obj_name)) + self._raiseFailure("{} not triggered by {}".format(exc_name, + self.obj_name)) else: - raise self.failureException("{0} not triggered" - .format(exc_name)) + self._raiseFailure("{} not triggered".format(exc_name)) class _TypeEqualityDict(object): @@ -547,7 +563,6 @@ class TestCase(object): except UnicodeDecodeError: return '%s : %s' % (safe_repr(standardMsg), safe_repr(msg)) - def assertRaises(self, excClass, callableObj=None, *args, **kwargs): """Fail unless an exception of class excClass is thrown by callableObj when invoked with arguments args and keyword @@ -562,6 +577,9 @@ class TestCase(object): with self.assertRaises(SomeException): do_something() + An optional keyword argument 'msg' can be provided when assertRaises + is used as a context object. + The context manager keeps a reference to the exception as the 'exception' attribute. This allows you to inspect the exception after the assertion:: @@ -572,25 +590,25 @@ class TestCase(object): self.assertEqual(the_exception.error_code, 3) """ context = _AssertRaisesContext(excClass, self, callableObj) - if callableObj is None: - return context - with context: - callableObj(*args, **kwargs) + return context.handle('assertRaises', callableObj, args, kwargs) def assertWarns(self, expected_warning, callable_obj=None, *args, **kwargs): """Fail unless a warning of class warnClass is triggered - by callableObj when invoked with arguments args and keyword + by callable_obj when invoked with arguments args and keyword arguments kwargs. If a different type of warning is triggered, it will not be handled: depending on the other warning filtering rules in effect, it might be silenced, printed out, or raised as an exception. - If called with callableObj omitted or None, will return a + If called with callable_obj omitted or None, will return a context object used like this:: with self.assertWarns(SomeWarning): do_something() + An optional keyword argument 'msg' can be provided when assertWarns + is used as a context object. + The context manager keeps a reference to the first matching warning as the 'warning' attribute; similarly, the 'filename' and 'lineno' attributes give you information about the line @@ -603,10 +621,7 @@ class TestCase(object): self.assertEqual(the_warning.some_attribute, 147) """ context = _AssertWarnsContext(expected_warning, self, callable_obj) - if callable_obj is None: - return context - with context: - callable_obj(*args, **kwargs) + return context.handle('assertWarns', callable_obj, args, kwargs) def _getAssertEqualityFunc(self, first, second): """Get a detailed comparison function for the types of the two args. @@ -1083,15 +1098,15 @@ class TestCase(object): expected_regex: Regex (re pattern object or string) expected to be found in error message. callable_obj: Function to be called. + msg: Optional message used in case of failure. Can only be used + when assertRaisesRegex is used as a context manager. args: Extra args. kwargs: Extra kwargs. """ context = _AssertRaisesContext(expected_exception, self, callable_obj, expected_regex) - if callable_obj is None: - return context - with context: - callable_obj(*args, **kwargs) + + return context.handle('assertRaisesRegex', callable_obj, args, kwargs) def assertWarnsRegex(self, expected_warning, expected_regex, callable_obj=None, *args, **kwargs): @@ -1105,15 +1120,14 @@ class TestCase(object): expected_regex: Regex (re pattern object or string) expected to be found in error message. callable_obj: Function to be called. + msg: Optional message used in case of failure. Can only be used + when assertWarnsRegex is used as a context manager. args: Extra args. kwargs: Extra kwargs. """ context = _AssertWarnsContext(expected_warning, self, callable_obj, expected_regex) - if callable_obj is None: - return context - with context: - callable_obj(*args, **kwargs) + return context.handle('assertWarnsRegex', callable_obj, args, kwargs) def assertRegex(self, text, expected_regex, msg=None): """Fail the test unless the text matches the regular expression.""" |