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Definitions of test cases with various interesting error-related behaviors, to
be used by test modules to exercise different features of trial's test runner.
See the L{twisted.trial.test.test_tests} module docstring for details about how
this code is arranged.
Some of these tests are also used by L{twisted.trial._dist.test}.
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Test failures for L{unittest.TestCase} based classes.
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A test case which has a L{test_foo} which will raise an error.
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