human
Solve the following python programming problem given the following code:
def test_recv__failure_sets_dirty_connection(self) : 
    def raise_error(* args) : 
        raise socket.error 
assert isinstance (raise_error.conn._sock, mock.Mock) 
    self.conn._sock.recv.side_effect = raise_error 
    try : 
        self.conn.recv (self.config ['request_id']) 
except ConnectionError : 
        self.assertIsNone (self.conn._sock) 

    
    

    Fix the buggy line: assert isinstance (raise_error.conn._sock, mock.Mock)
assistant
#Here is Python program to fix the buggy line: assert isinstance (raise_error.

assert isinstance (self.conn._sock, mock.Mock)