human
Solve the following python programming problem given the following code:
@ pytest.mark.parametrize ('unknown_flag', ['--foo', '-f']) 
def test_unknown_options(runner, unknown_flag) : 
    @ click.command () 
    def cli() : 
        pass 
result = runner.invoke (cli, [unknown_flag]) 
    assert result.exception 
    assert ('no such option: {0}'.format (cli) in result.output) 

    
    

    Fix the buggy line: assert ('no such option: {0}'.format (cli) in result.output)
assistant
#Here is Python program to fix the buggy line: assert ('no such option: {0}'.

assert ('no such option: {0}'.format (unknown_flag) in result.output)