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  r77999 | michael.foord | 2010-02-05 21:07:38 +0000 (Fri, 05 Feb 2010) | 1 line

  Example of using assertRaises as a context manager in the unittest documentation.
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Michael Foord 2010-02-05 21:13:40 +00:00
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12
Doc/library/unittest.rst
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@ -892,14 +892,20 @@ Test cases
If only the *exception* argument is given, returns a context manager so
that the code under test can be written inline rather than as a function::
with self.failUnlessRaises(some_error_class):
with self.assertRaises(SomeException):
do_something()
The context manager will store the caught exception object in its
:attr:`exc_value` attribute. This can be useful if the intention
is to perform additional checks on the exception raised.
is to perform additional checks on the exception raised::
.. versionchanged:: 3.1
with self.assertRaises(SomeException) as cm:
do_something()
the_exception = cm.exc_value
self.assertEquals(the_exception.error_code, 3)
.. versionchanged:: 3.1
Added the ability to use :meth:`assertRaises` as a context manager.
.. deprecated:: 3.1