test_ok1/doc/ja/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)
result.stdout.fnmatch_lines([
"*39 failed*"
])
assert result.ret != 0