[Python-Dev] unittest missing assertNotRaises

[Wilfred Hughes]

On 27 September 2011 19:59, Laurens Van Houtven <_ at lvh.cc> wrote:
> Sure, you just *do* it. The only advantage I see in assertNotRaises is that when that exception is raised, you should (and would) get a failure, not an error.

It's a useful distinction. I have found myself writing code of the form:

def test_old_exception_no_longer_raised(self):
    try:
        do_something():
    except OldException:
        self.assertTrue(False)

in order to distinguish between a regression and something new
erroring. The limitation of this pattern is that the test failure
message is not as good.