def test_Bandb_return_value(self):
     self.assertEqual("second", switch_average('B'))
     self.assertEqual("second", switch_average('b'))
 def test_Aanda_return_value(self):
     self.assertEqual("first", switch_average('A'))
     self.assertEqual("first", switch_average('a'))
 def test_nonkey_input(self):
     self.assertEqual('Key input not found', switch_average('z'))
 def test_Eande_return_value(self):
     self.assertEqual("fifth", switch_average('E'))
     self.assertEqual("fifth", switch_average('e'))
 def test_Dandd_return_value(self):
     self.assertEqual("fourth", switch_average('D'))
     self.assertEqual("fourth", switch_average('d'))
 def test_Candc_return_value(self):
     self.assertEqual("third", switch_average('C'))
     self.assertEqual("third", switch_average('c'))