human
Solve the following python programming problem given the following code:
def test_max_attempt_reached_not_raised_for_multiple_runs(self, sleep_mock) : 
    predicate = mock.Mock () 
    @ retrying.retry (max_attempts = 2, predicate = predicate) 
    def foo() : 
        return 'fake' 
for _ in range (5) : 
        predicate.side_effect = (False, True) 
        sleep_mock.reset_mock () 
        self.assertEqual ('fake', foo ()) 
        self.assertCalledOnce (predicate) 

    
    

    Fix the buggy line: self.assertCalledOnce (predicate)
assistant
#Here is Python program to fix the buggy line: self.

self.assertCalledOnce (sleep_mock)