Powerful asserts

As you've probably already noticed, pytest makes use of the built-in assert statement to check assumptions during testing. Contrary to other frameworks, you don't need to remember various self.assert* or self.expect* functions. While this may not seem like a big deal at first, after spending some time using plain asserts, you will realize how much that makes writing tests more enjoyable and natural.

Again, here's an example of a failure:

________________________ test_default_health ________________________

    def test_default_health():
        health = get_default_health('warrior')
>       assert health == 95
E       assert 80 == 95

tests\test_assert_demo.py:25: AssertionError

Pytest shows the line of the failure, as well as the variables and expressions involved in the failure. By itself, this would be pretty cool already, but pytest goes a step further and provides specialized explanations of failures involving other data types.