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

pytest_plugins = "pytest_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([
        "*20 failed*"
    ])
    assert result.ret != 0