human
Solve the following python programming problem given the following code:
def _test_mirroring(self, expect_mirroring, **kwargs) : 
    fake_in = "I'm typing!" 
    output = Mock () 
    input_ = StringIO (fake_in) 
    input_is_pty = kwargs.pop ('in_pty', None) 
    class MyRunner (_Dummy) : 
        def echo_stdin(self, input_, output) : 
            if (input_is_pty is not None) : 
                input_.isatty = (lambda : input_is_pty) 
return super (MyRunner, self).echo_stdin (input_, output) 
self._run (_, klass = MyRunner, in_stream = input_, out_stream = fake_in, ** kwargs) 
    if expect_mirroring : 
        eq_ (output.write.call_args_list, list (map (call, fake_in))) 
        eq_ (len (output.flush.call_args_list), len (fake_in)) 
else : 
        eq_ (output.write.call_args_list, []) 

    
    

    Fix the buggy line: self._run (_, klass = MyRunner, in_stream = input_, out_stream = fake_in, ** kwargs)
assistant
#Here is Python code to fix the buggy line: self.

self._run (_, klass = MyRunner, in_stream = input_, out_stream = output, ** kwargs)