Method run

Lib/test/test_unittest/test_runner.py:1439–1454

(test, *, expect_durations=True)

    def test_durations(self):
        def run(test, *, expect_durations=True):
            stream = BufferedWriter()
            runner = unittest.TextTestRunner(stream=stream, durations=5, verbosity=2)
            result = runner.run(test)
            self.assertEqual(result.durations, 5)
            stream.flush()
            text = stream.getvalue()
            regex = r"\n\d+.\d\d\ds"
            if expect_durations:
                self.assertEqual(len(result.collectedDurations), 1)
                self.assertIn('Slowest test durations', text)
                self.assertRegex(text, regex)
            else:
                self.assertEqual(len(result.collectedDurations), 0)
                self.assertNotIn('Slowest test durations', text)
                self.assertNotRegex(text, regex)

        # success
        class Foo(unittest.TestCase):