def test_ratio_difference_zero(self):
     """Test difference of two identical ratios"""
     ingredients, _ = test_data()
     ratio_1 = create_ratio(ingredients, [1, 2, 3])
     ratio_2 = create_ratio(ingredients, [1, 2, 3])
     difference, _ = percentage_difference(ratio_1, ratio_2)
     self.assertEquals(0, difference)
 def test_ratio_difference(self):
     """Test per ingredient and over all percentage difference"""
     ingredients, _ = test_data()
     ratio_1 = create_ratio(ingredients, [1, 30, 100])
     ratio_2 = create_ratio(ingredients, [1, 60, 50])
     difference, differences = percentage_difference(ratio_1, ratio_2)
     self.assertAlmostEquals(0.496, difference, 2)
     self.assertAlmostEquals(differences[1][0], 0.81, 2)
     self.assertEquals(differences[1][1], EGG)
     self.assertAlmostEquals(differences[0][0], 0.17, 2)
     self.assertEquals(differences[0][1], FLOUR)