def test_sum(self):
     self.assertEqual(mid(0, 2), 1, "Should be 2")
 def test_sum_5(self):
     self.assertEqual(mid(2, 4), 2, "Should be 2")
 def test_sum_3(self):
     self.assertEqual(mid(3, 3), 3, "Should be 3")
 def test_sum_4(self):
     self.assertEqual(mid(5, 3), 1, "Should be 4")
 def test_sum_2(self):
     self.assertEqual(mid(5, 5), 5, "Should be 5")