assert_warns(warning_class, *args, **kwargs)
A warning of class warning_class should be thrown by the callable when invoked with arguments args and keyword arguments kwargs. If a different type of warning is thrown, it will not be caught.
If called with all arguments other than the warning class omitted, may be used as a context manager:
with assert_warns(SomeWarning):
do_something()
The ability to be used as a context manager is new in NumPy v1.11.0.
The class defining the warning that :None:None:`func` is expected to throw.
Callable to test
Arguments for :None:None:`func`.
Keyword arguments for :None:None:`func`.
Fail unless the given callable throws the specified warning.
>>> import warningsSee :
... def deprecated_func(num):
... warnings.warn("Please upgrade", DeprecationWarning)
... return num*num
... with np.testing.assert_warns(DeprecationWarning):
... assert deprecated_func(4) == 16
... # or passing a func
... ret = np.testing.assert_warns(DeprecationWarning, deprecated_func, 4)
... assert ret == 16
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skimage._shared._warnings.all_warnings
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