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)