21 lines
718 B
Ruby
21 lines
718 B
Ruby
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require 'rails_helper'
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RSpec.describe UsdaFood do
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describe '#calculate_density' do
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it 'returns nil for invalid values' do
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expect(build(:usda_food_weight, description: nil).calculate_density).to be_nil
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expect(build(:usda_food_weight, amount: nil).calculate_density).to be_nil
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expect(build(:usda_food_weight, gram_weight: nil).calculate_density).to be_nil
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expect(build(:usda_food_weight, description: 'cats').calculate_density).to be_nil
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end
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it 'returns a density in oz / cup' do
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expect(build(:usda_food_weight).calculate_density.raw_value).to be_within(0.1).of(12.3)
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expect(build(:usda_food_weight).calculate_density.unit.to_s).to eq 'ounce/cup'
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end
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end
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end
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