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)
def main(self, show_percentage_change, precision):
"""Entry method for script"""
self.number_template = "%%0.%df" % precision
output = Output()
self.print_ratios(output)
diff_info = percentage_difference(self.ratio1, self.ratio2)
mean_difference, differences = diff_info
if show_percentage_change is False:
self.print_percentage_difference(output, differences)
else:
self.print_percentage_change(output)
self.print_overall_percentage_diff(output, mean_difference)
return str(output)
