def test_equals_2(self):
     self.assertEqual(add_binary(0, 1), '1')
 def test_equals(self):
     self.assertEqual(add_binary(1, 1), '10')
 def test_equals_4(self):
     self.assertEqual(add_binary(2, 2), '100')
 def test_equals_5(self):
     self.assertEqual(add_binary(51, 12), '111111')
 def test_equals_3(self):
     self.assertEqual(add_binary(1, 0), '1')