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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?
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There are two ways you can use assertRaises: using keyword arguments. Just pass the exception, the callable function and the parameters of the callable function as keyword arguments that will elicit the exception. Make a function call that should raise the exception with a context.
An exception object is created when a Python script raises an exception. If the script explicitly doesn't handle the exception, the program will be forced to terminate abruptly.
assertFalse() in Python is a unittest library function that is used in unit testing to compare test value with false. This function will take two parameters as input and return a boolean value depending upon the assert condition. If test value is false then assertFalse() will return true else return false.
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.
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