human
Solve the following python programming problem given the following code:
def test_returns_object_returned_by_function(self, sleep_mock) : 
    expected_rv = 0 
    def func() : 
        return expected_rv 
retry = retrying.Retry (max_attempts = 10, predicate_retval_as_arg = True, predicate = (lambda rv : (rv == expected_rv))) 
    actual_rv = retry.run (func) 
    self.assertEqual (1, retry.attempt) 
    self.assertEqual (expected_rv, actual_rv) 
    self.assertFalse (self.called) 

    
    

    Fix the buggy line: self.assertFalse (self.called)
assistant
#Here is Python code to fix the buggy line: self.

self.assertFalse (sleep_mock.called)