F                                                                        [100%]
=================================== FAILURES ===================================
__________________________________ test_fail ___________________________________

>   def test_fail(): assert 0
                     ^^^^^^^^
E   assert 0

test_a.py:1: AssertionError
=========================== short test summary info ============================
FAILED test_a.py::test_fail - assert 0
1 failed in 0.01s