testing/web-platform/tests/tools/pytest/doc/en/example/assertion/test_failures.py


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import py
failure_demo = py.path.local(__file__).dirpath('failure_demo.py')
pytest_plugins = 'pytester',

def test_failure_demo_fails_properly(testdir):
    target = testdir.tmpdir.join(failure_demo.basename)
    failure_demo.copy(target)
    failure_demo.copy(testdir.tmpdir.join(failure_demo.basename))
    result = testdir.runpytest(target, syspathinsert=True)
    result.stdout.fnmatch_lines([
        "*42 failed*"
    ])
    assert result.ret != 0