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64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
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import warnings
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from testfixtures import Comparison as C, compare
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class ShouldWarn(warnings.catch_warnings):
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"""
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This context manager is used to assert that warnings are issued
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within the context it is managing.
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:param expected: This should be a sequence made up of one or more elements,
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each of one of the following types:
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* A warning class, indicating that the type
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of the warnings is important but not the
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parameters it is created with.
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* A warning instance, indicating that a
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warning exactly matching the one supplied
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should have been issued.
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If no expected warnings are passed, you will need to inspect
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the contents of the list returned by the context manager.
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:param filters:
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If passed, these are used to create a filter such that only warnings you
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are interested in will be considered by this :class:`ShouldWarn`
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instance. The names and meanings are the same as the parameters for
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:func:`warnings.filterwarnings`.
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"""
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_empty_okay = False
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def __init__(self, *expected, **filters):
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super(ShouldWarn, self).__init__(record=True)
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self.expected = [C(e) for e in expected]
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self.filters = filters
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def __enter__(self):
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self.recorded = super(ShouldWarn, self).__enter__()
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warnings.filterwarnings("always", **self.filters)
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return self.recorded
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def __exit__(self, exc_type, exc_val, exc_tb):
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super(ShouldWarn, self).__exit__(exc_type, exc_val, exc_tb)
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if not self.recorded and self._empty_okay:
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return
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if not self.expected and self.recorded and not self._empty_okay:
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return
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compare(self.expected, actual=[wm.message for wm in self.recorded])
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class ShouldNotWarn(ShouldWarn):
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"""
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This context manager is used to assert that no warnings are issued
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within the context it is managing.
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"""
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_empty_okay = True
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def __init__(self):
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super(ShouldNotWarn, self).__init__()
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