def test_ex2(self):
     output_signal = output_signal_from_line('dd OR do -> dp')
     self.assertEqual('dp', output_signal)
 def test_ex3(self):
     output_signal = output_signal_from_line('44430 -> b')
     self.assertEqual('b', output_signal)
 def test_ex1(self):
     output_signal = output_signal_from_line('NOT dq -> dr')
     self.assertEqual('dr', output_signal)