def test_100_factory_in_degrees_celsius(self):
     self.assertEqual(Temperature.from_celsius(50).in_celsius(), 50,
                          '50 c should equal 50 c')
     self.assertEqual(Temperature.from_celsius(50).in_fahrenheit(), 122,
                          '50 c should equal 122 f')
 def test_factory_celsius(self): #"factory method"
     self.assertEqual(Temperature.from_celsius(50).in_celsius(), 50)
     self.assertEqual(Temperature.from_celsius(50).in_fahrenheit(), 122)