Author pitrou
Recipients Julian, Yaroslav.Halchenko, abingham, bfroehle, borja.ruiz, brian.curtin, chris.jerdonek, eric.araujo, eric.snow, exarkun, ezio.melotti, florian-rathgeber, fperez, hpk, michael.foord, nchauvat, ncoghlan, pitrou, r.david.murray, santoso.wijaya, spiv
Date 2013-01-18.21:07:11
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Message-id <1358543231.78.0.354364612897.issue16997@psf.upfronthosting.co.za>
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Content
subtests are a light alternative to parametered tests as in issue7897. They don't generate the tests for you, they simply allow to partition a given test case in several logical units. Meaning, when a subtest fails, the other subtests in the test will still run (and the failures will print their respective parameters).

Concretely, running the follow example:

class MyTest(unittest.TestCase):

    def test_b(self):
        """some test"""
        for i in range(2, 5):
            for j in range(0, 3):
                with self.subTest(i=i, j=j):
                    self.assertNotEqual(i % 3, j)


will give the following output:

======================================================================
FAIL: test_b (__main__.MyTest) (i=2, j=2)
some test
----------------------------------------------------------------------
Traceback (most recent call last):
  File "subtests.py", line 11, in test_b
    self.assertNotEqual(i % 3, j)
AssertionError: 2 == 2

======================================================================
FAIL: test_b (__main__.MyTest) (i=3, j=0)
some test
----------------------------------------------------------------------
Traceback (most recent call last):
  File "subtests.py", line 11, in test_b
    self.assertNotEqual(i % 3, j)
AssertionError: 0 == 0

======================================================================
FAIL: test_b (__main__.MyTest) (i=4, j=1)
some test
----------------------------------------------------------------------
Traceback (most recent call last):
  File "subtests.py", line 11, in test_b
    self.assertNotEqual(i % 3, j)
AssertionError: 1 == 1

----------------------------------------------------------------------
History
Date User Action Args
2013-01-18 21:07:11pitrousetrecipients: + pitrou, spiv, exarkun, ncoghlan, ezio.melotti, eric.araujo, r.david.murray, michael.foord, brian.curtin, hpk, fperez, chris.jerdonek, Yaroslav.Halchenko, santoso.wijaya, nchauvat, florian-rathgeber, Julian, abingham, eric.snow, borja.ruiz, bfroehle
2013-01-18 21:07:11pitrousetmessageid: <1358543231.78.0.354364612897.issue16997@psf.upfronthosting.co.za>
2013-01-18 21:07:11pitroulinkissue16997 messages
2013-01-18 21:07:11pitroucreate