def test_input_extension(self):
        """Input file must have an extension. Throw error if none is given."""
        path = os.path.join(self.temp_dir, "example")
        shutil.copy("example.mp4", path)
        self.check([path, "--no-open"], "must have an extension")
Input file must have an extension. Throw error if none is given.
auto_editor/cmds/test.py