Pass a Python unittest if an exception isn't raised
python, unit-testing
Solution
If I understand your question correctly, you could do something like this:
def test_does_not_raise_on_valid_input(self):
raised = False
try:
do_something(42)
except:
raised = True
self.assertFalse(raised, 'Exception raised')
...assuming that you have a corresponding test that the correct `Exception` gets raised on invalid input, of course:
def test_does_raise_on_invalid_input(self):
self.assertRaises(OutOfCheese, do_something, 43)
However, as pointed out in the comments, you need to consider what it is that you are actually testing. It's likely that a test like...
def test_what_is_42(self):
self.assertEquals(do_something(42), 'Meaning of life')
...is better because it tests the desired behaviour of the system and will fail if an exception is raised.
Problem
In the Python `unittest` framework, is there a way to pass a unit test if an exception wasn't raised, and fail with an AssertRaise otherwise?