New submission from Antoine Pitrou:
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
----------------------------------------------------------------------
----------
components: Library (Lib)
messages: 180221
nosy: 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, santa4nt, spiv
priority: normal
severity: normal
status: open
title: subtests
type: enhancement
versions: Python 3.4
_______________________________________
Python tracker <[email protected]>
<http://bugs.python.org/issue16997>
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