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Showing content from https://github.com/pytest-dev/pytest-subtests below:

pytest-dev/pytest-subtests: unittest subTest() support and subtests fixture

unittest subTest() support and subtests fixture.

This pytest plugin was generated with Cookiecutter along with @hackebrot's cookiecutter-pytest-plugin template.

• Adds support for TestCase.subTest.
• New subtests fixture, providing similar functionality for pure pytest tests.

You can install pytest-subtests via pip from PyPI:

$ pip install pytest-subtests

import unittest


class T(unittest.TestCase):
    def test_foo(self):
        for i in range(5):
            with self.subTest("custom message", i=i):
                self.assertEqual(i % 2, 0)


if __name__ == "__main__":
    unittest.main()

Output

λ pytest .tmp\test-unit-subtest.py
======================== test session starts ========================
...
collected 1 item

.tmp\test-unit-subtest.py FF.                                  [100%]

============================= FAILURES ==============================
_________________ T.test_foo [custom message] (i=1) _________________

self = <test-unit-subtest.T testMethod=test_foo>

    def test_foo(self):
        for i in range(5):
            with self.subTest('custom message', i=i):
>               self.assertEqual(i % 2, 0)
E               AssertionError: 1 != 0

.tmp\test-unit-subtest.py:9: AssertionError
_________________ T.test_foo [custom message] (i=3) _________________

self = <test-unit-subtest.T testMethod=test_foo>

    def test_foo(self):
        for i in range(5):
            with self.subTest('custom message', i=i):
>               self.assertEqual(i % 2, 0)
E               AssertionError: 1 != 0

.tmp\test-unit-subtest.py:9: AssertionError
================ 2 failed, 1 passed in 0.07 seconds =================

def test(subtests):
    for i in range(5):
        with subtests.test(msg="custom message", i=i):
            assert i % 2 == 0

Output

λ pytest .tmp\test-subtest.py
======================== test session starts ========================
...
collected 1 item

.tmp\test-subtest.py .F.F..                                    [100%]

============================= FAILURES ==============================
____________________ test [custom message] (i=1) ____________________

    def test(subtests):
        for i in range(5):
            with subtests.test(msg='custom message', i=i):
>               assert i % 2 == 0
E               assert (1 % 2) == 0

.tmp\test-subtest.py:4: AssertionError
____________________ test [custom message] (i=3) ____________________

    def test(subtests):
        for i in range(5):
            with subtests.test(msg='custom message', i=i):
>               assert i % 2 == 0
E               assert (3 % 2) == 0

.tmp\test-subtest.py:4: AssertionError
================ 2 failed, 1 passed in 0.07 seconds =================

Contributions are very welcome. Tests can be run with tox.

Distributed under the terms of the MIT license, "pytest-subtests" is free and open source software

If you encounter any problems, please file an issue along with a detailed description.

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