parsley/spec/models/ingredient_spec.rb

require 'rails_helper'

RSpec.describe Ingredient, type: :model do

  describe 'validation' do

    it 'validates density' do
      i = build(:ingredient)
      expect(i).to be_valid

      i.density = '5'
      expect(i).not_to be_valid

      i.density = '5 cup'
      expect(i).not_to be_valid

      i.density = '5 gram/cup'
      expect(i).to be_valid

      i.density = '5 mile/hour'
      expect(i).not_to be_valid
    end

  end

  describe 'set_usda_food' do
    it 'sets the density' do
      i = build(:ingredient)
      f = create(:salted_butter)
      create(:usda_food_weight, usda_food: f)

      i.set_usda_food(f)

      expect(i.density).not_to be_nil
    end
  end

  describe '#custom_unit_weight' do
    it 'returns a ValueUnit for valid custom weights' do
      i = build(:ingredient)
      i.ingredient_units << IngredientUnit.new(name: 'clove', gram_weight: 20.0)

      vu = i.custom_unit_weight('clove')
      expect(vu).not_to be_nil
      expect(vu.raw_value).to eq 20.0
      expect(vu.unit.to_s).to eq 'gram'
    end
  end

end