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99 lines
3.2 KiB
Python
99 lines
3.2 KiB
Python
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from contextlib import contextmanager
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from functools import wraps
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from testfixtures import Comparison, diff, compare
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from testfixtures.utils import match_type_or_instance
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param_docs = """
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:param exception: This can be one of the following:
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* `None`, indicating that an exception must be
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raised, but the type is unimportant.
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* An exception class, indicating that the type
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of the exception is important but not the
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parameters it is created with.
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* An exception instance, indicating that an
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exception exactly matching the one supplied
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should be raised.
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:param unless: Can be passed a boolean that, when ``True`` indicates that
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no exception is expected. This is useful when checking
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that exceptions are only raised on certain versions of
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Python.
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"""
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class ShouldRaise(object):
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__doc__ = """
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This context manager is used to assert that an exception is raised
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within the context it is managing.
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""" + param_docs
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#: The exception captured by the context manager.
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#: Can be used to inspect specific attributes of the exception.
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raised = None
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def __init__(self, exception=None, unless=False):
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self.exception = exception
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self.expected = not unless
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def __enter__(self):
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return self
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def __exit__(self, type, actual, traceback):
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__tracebackhide__ = True
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self.raised = actual
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if self.expected:
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if self.exception:
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compare(self.exception,
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match_type_or_instance(self.exception, actual),
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x_label='expected',
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y_label='raised')
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elif not actual:
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raise AssertionError('No exception raised!')
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elif actual:
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raise AssertionError('%r raised, no exception expected' % actual)
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return True
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class should_raise:
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__doc__ = """
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A decorator to assert that the decorated function will raised
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an exception. An exception class or exception instance may be
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passed to check more specifically exactly what exception will be
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raised.
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""" + param_docs
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def __init__(self, exception=None, unless=None):
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self.exception = exception
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self.unless = unless
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def __call__(self, target):
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@wraps(target)
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def _should_raise_wrapper(*args, **kw):
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with ShouldRaise(self.exception, self.unless):
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target(*args, **kw)
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return _should_raise_wrapper
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@contextmanager
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def ShouldAssert(expected_text):
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"""
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A context manager to check that an :class:`AssertionError`
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is raised and its text is as expected.
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"""
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try:
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yield
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except AssertionError as e:
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actual_text = str(e)
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if expected_text != actual_text:
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raise AssertionError(diff(expected_text, actual_text,
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x_label='expected', y_label='actual'))
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else:
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raise AssertionError('Expected AssertionError(%r), None raised!' %
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expected_text)
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