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Classe « TestCase » Python 3.13.2

Méthode unittest.TestCase.assertWarns

Signature de la méthode assertWarns

def assertWarns(self, expected_warning, *args, **kwargs) 

Description

help(TestCase.assertWarns)

Fail unless a warning of class warnClass is triggered
by the callable when invoked with specified positional and
keyword arguments.  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 the callable and arguments omitted, 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
of Python code from which the warning was triggered.
This allows you to inspect the warning after the assertion::

    with self.assertWarns(SomeWarning) as cm:
        do_something()
    the_warning = cm.warning
    self.assertEqual(the_warning.some_attribute, 147)

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