unittest assertRaises Problem

Jean-Paul Calderone exarkun at divmod.com
Tue Apr 17 00:35:11 CEST 2007


On 16 Apr 2007 15:13:42 -0700, john <puopolo at gmail.com> wrote:
>All:
>
>Hi. I am an experienced developer (15 yrs), but new to Python and have
>a question re unittest and assertRaises. No matter what I raise,
>assertRaises is never successful. Here is the test code:
>
>
>class Foo:
>    def testException(self):
>       raise ValueError
>
>class FooTestCase(unittest.TestCase):
>
>       testTryThis(self):
>          f = Foo()
>          self.assertRaises(ValueError, f.testException())
>

The 2nd argument to assertRaises should be a callable.  assertRaises
will call it (so that it can do exception handling), so you shouldn't:

    self.assertRaises(ValueError, f.testException)

Jean-Paul



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