def METHOD_NAME(self, actual, expected = None):
    if not expected: expected = actual
    with open(os.path.join(self.path, expected)) as f:
        expected_contents = f.read().strip()
    with open(os.path.join(self.path, 'output', actual)) as f:
        actual_contents = f.read().strip()
    return actual_contents, expected_contents