TestクラスをTestCase以外のクラスもmixinで継承した場合にtest対象に含まれるか確認する

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TestクラスをTestCase以外のクラスもmixinで継承した場合にtest対象に含まれるか確認する

Pythonのテストの探索でmixinしても大丈夫かどうかを確認してみます。

test_it.py::

from unittest import TestCase


class Mixin(object):
    def dummy(self):
        pass


class SimpleTest(TestCase, Mixin):
    def test_fail(self):
        self.fail()

unittest

python -m unittest test_it
F
======================================================================
FAIL: test_fail (test_it.SimpleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "test_it.py", line 11, in test_fail
    self.fail()
AssertionError: None

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)
make: *** [unittest] Error 1

-> される

pytest

pytest
============================================================================================================================= test session starts ==============================================================================================================================
platform darwin -- Python 2.7.12, pytest-3.0.3, py-1.4.31, pluggy-0.4.0
rootdir: /path/to/test, inifile:
collected 1 items

test_it.py F

=================================================================================================================================== FAILURES ===================================================================================================================================
_____________________________________________________________________________________________________________________________ SimpleTest.test_fail _____________________________________________________________________________________________________________________________

self = <test_it.SimpleTest testMethod=test_fail>

    def test_fail(self):
>       self.fail()
E       AssertionError: None

test_it.py:11: AssertionError
=========================================================================================================================== 1 failed in 0.11 seconds ===========================================================================================================================
make: *** [pytest] Error 1

-> される

nose

nosetests
F
======================================================================
FAIL: test_fail (test_it.SimpleTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/path/to/test/test_it.py", line 11, in test_fail
    self.fail()
AssertionError: None

----------------------------------------------------------------------
Ran 1 test in 0.061s

FAILED (failures=1)
make: *** [nosetests] Error 1

-> される

結論

• mixinされてても探索される
• そもそも関数名で探索している模様

deploy.mk

.PHONY: pytest
pytest:
	pytest

.PHONY: nosetests
nosetests:
	nosetests

.PHONY: unitteset
unittest:
	python -m unittest test_it

test_it.py

from unittest import TestCase


class Mixin(object):
    def dummy(self):
        pass


class SimpleTest(TestCase, Mixin):
    def test_fail(self):
        self.fail()