Python 3.4. subTest example

subTest

This is a comment on http://eli.thegreenplace.net/2014/04/02/dynamically-generating-python-test-cases/

test_example.py

import unittest

class TestsContainer(unittest.TestCase):
    longMessage = True

    testsmap = {
        'foo': [1, 1],
        'bar': [1, 2],
        'baz': [5, 5],
        'baf': [5, 6],
    }

    def test_a(self):
        for name, (a, b) in self.testsmap.items():
            with self.subTest(name=name):
                self.assertEqual(a, b, name)

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

the_output

======================================================================
FAIL: test_a (__main__.TestsContainer) (name='bar')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/x.py", line 16, in test_a
    self.assertEqual(a, b, name)
AssertionError: 1 != 2 : bar

======================================================================
FAIL: test_a (__main__.TestsContainer) (name='baf')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/x.py", line 16, in test_a
    self.assertEqual(a, b, name)
AssertionError: 5 != 6 : baf

----------------------------------------------------------------------
Ran 1 test in 0.001s

FAILED (failures=2)