Failing Tests

A failing test will provide helpful output as to what went wrong:

# projectroot/tests/test_code.py
from module import code

def test_add__failing():
    assert code.add(10, 11) == 33

Results:

$ py.test
================================================== test session starts ===================================================
platform darwin -- Python 2.7.10, pytest-2.9.2, py-1.4.31, pluggy-0.3.1
rootdir: /projectroot, inifile:
collected 1 items

tests/test_code.py F

======================================================== FAILURES ========================================================
___________________________________________________ test_add__failing ____________________________________________________

    def test_add__failing():
>       assert code.add(10, 11) == 33
E       assert 21 == 33
E        +  where 21 = <function add at 0x105d4d6e0>(10, 11)
E        +    where <function add at 0x105d4d6e0> = code.add

tests/test_code.py:5: AssertionError
================================================ 1 failed in 0.01 seconds ================================================

Found a mistake? Have a question or improvement idea? Let me know.

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