def test_convert_nutrition_info(self):
"""Convert FoodNutritionInfo to different Units.
"""
gram = Unit.objects.get(name='gram')
kilogram = Unit.objects.get(name='kilogram')
butter = Food.objects.get(name='butter')
ten_grams_butter = FoodNutritionInfo(
quantity = 10,
unit = gram,
food = butter,
calories = 100,
fat_calories = 80,
fat = 50,
carb = 20,
sodium = 10,
protein = 5,
cholesterol = 0,
)
one_kilo_butter = ten_grams_butter.for_amount(1, kilogram)
expected_total = FoodNutritionInfo(
quantity = 1.0,
unit = kilogram,
food = butter,
calories = 10000,
fat_calories = 8000,
fat = 5000,
carb = 2000,
sodium = 1000,
protein = 500,
cholesterol = 0,
)
self.assertTrue(one_kilo_butter.is_equal(expected_total))
five_grams_butter = ten_grams_butter.for_amount(5, gram)
expected_total = FoodNutritionInfo(
quantity = 5,
unit = gram,
food = butter,
calories = 50,
fat_calories = 40,
fat = 25,
carb = 10,
sodium = 5,
protein = 2.5,
cholesterol = 0,
)
self.assertTrue(five_grams_butter.is_equal(expected_total))
def test_convert_nutrition_info_weight_to_volume(self):
"""Convert FoodNutritionInfo from weight to volume.
"""
# Test data
gram = Unit.objects.get(name='gram')
butter = Food.objects.get(name='butter')
cup = Unit.objects.get(name='cup')
ml = Unit.objects.get(name='milliliter')
ml_per_cup = Equivalence.objects.get(unit=cup, to_unit=ml).to_quantity
butter_nutrition = FoodNutritionInfo(
food = butter,
quantity = 14.0,
unit = gram,
calories = 100,
fat_calories = 100,
fat = 11,
carb = 0,
sodium = 90,
protein = 0,
cholesterol = 30,
)
# Multiplier for a 1-gram serving size
gram_serving = 1.0 / (1.0 * 14.0) # 14.0 g/serving
# Number of grams in target amount
target_grams = butter.grams_per_ml * ml_per_cup
# Expected nutrition multiplier for a 1-cup amount
servings_per_cup = gram_serving * target_grams
# Ensure the amount calculated matches the 1-cup amount
butter_nutrition_cup = butter_nutrition.for_amount(1, cup)
expected_total = FoodNutritionInfo(
quantity = 1.0,
unit = cup,
food = butter,
calories = servings_per_cup * 100,
fat_calories = servings_per_cup * 100,
fat = servings_per_cup * 11,
carb = servings_per_cup * 0,
sodium = servings_per_cup * 90,
protein = servings_per_cup * 0,
cholesterol = servings_per_cup * 30,
)
self.assertTrue(butter_nutrition_cup.is_equal(expected_total))
def test_convert_nutrition_info_volume_to_weight(self):
"""Convert FoodNutritionInfo from volume to weight.
"""
kilogram = Unit.objects.get(name='kilogram')
tbs = Unit.objects.get(name='tablespoon')
ml = Unit.objects.get(name='milliliter')
ml_per_tbs = Equivalence.objects.get(unit=tbs, to_unit=ml).to_quantity
peanut_butter = Food.objects.get(name='peanut butter')
two_tbs_peanut_butter = FoodNutritionInfo(
food = peanut_butter,
quantity = 2.0,
unit = tbs,
calories = 180,
fat_calories = 110,
fat = 12,
carb = 12,
sodium = 110,
protein = 7,
cholesterol = 0,
)
# 14.8 ml/tbs, 0.76 g/ml, 2.0 tbs/serving
gram_serving = 1.0 / (ml_per_tbs * peanut_butter.grams_per_ml * 2.0)
target_grams = 1000.0
servings_per_kg = gram_serving * target_grams
one_kilo_peanut_butter = two_tbs_peanut_butter.for_amount(1, kilogram)
expected_total = FoodNutritionInfo(
quantity = 1.0,
unit = kilogram,
food = peanut_butter,
calories = servings_per_kg * 180,
fat_calories = servings_per_kg * 110,
fat = servings_per_kg * 12,
carb = servings_per_kg * 12,
sodium = servings_per_kg * 110,
protein = servings_per_kg * 7,
cholesterol = servings_per_kg * 0,
)
self.assertTrue(one_kilo_peanut_butter.is_equal(expected_total))