_test_unittest2_with.py 文件源码

def testAssertWarnsCallable(self):
        def _runtime_warn():
            warnings.warn("foo", RuntimeWarning)
        # Success when the right warning is triggered, even several times
        self.assertWarns(RuntimeWarning, _runtime_warn)
        self.assertWarns(RuntimeWarning, _runtime_warn)
        # A tuple of warning classes is accepted
        self.assertWarns((DeprecationWarning, RuntimeWarning), _runtime_warn)
        # *args and **kwargs also work
        self.assertWarns(RuntimeWarning,
                         warnings.warn, "foo", category=RuntimeWarning)
        # Failure when no warning is triggered
        with self.assertRaises(self.failureException):
            self.assertWarns(RuntimeWarning, lambda: 0)
        # Failure when another warning is triggered
        with catch_warnings():
            # Force default filter (in case tests are run with -We)
            warnings.simplefilter("default", RuntimeWarning)
            with self.assertRaises(self.failureException):
                self.assertWarns(DeprecationWarning, _runtime_warn)
        # Filters for other warnings are not modified
        with catch_warnings():
            warnings.simplefilter("error", RuntimeWarning)
            with self.assertRaises(RuntimeWarning):
                self.assertWarns(DeprecationWarning, _runtime_warn)