openfoodnetwork/spec/models/product_distribution_spec.rb

require 'spec_helper'

describe ProductDistribution do
  it "is unique for scope [product, distributor]" do
    pd1 = create(:product_distribution)
    expect(pd1).to be_valid

    new_product = create(:product)
    new_distributor = create(:distributor_enterprise)

    pd2 = build(:product_distribution, :product => pd1.product, :distributor => pd1.distributor)
    expect(pd2).to_not be_valid

    pd2 = build(:product_distribution, :product => pd1.product, :distributor => new_distributor)
    expect(pd2).to be_valid

    pd2 = build(:product_distribution, :product => new_product, :distributor => pd1.distributor)
    expect(pd2).to be_valid

    pd2 = build(:product_distribution, :product => new_product, :distributor => new_distributor)
    expect(pd2).to be_valid
  end


  describe "adjusting orders" do
    context "integration" do
      let(:distributor) { create(:distributor_enterprise) }
      let(:product) { create(:product, name: 'Pear') }
      let(:enterprise_fee) { create(:enterprise_fee, calculator: build(:calculator), enterprise: distributor) }
      let!(:product_distribution) { create(:product_distribution, product: product, distributor: distributor, enterprise_fee: enterprise_fee) }
      let(:order) { create(:order, distributor: distributor) }

      it "creates an adjustment for product distributions" do
        enterprise_fee.calculator.preferred_amount = 1.23
        enterprise_fee.calculator.save!

        # When I add the product to the order, an adjustment should be made
        expect do
          cart_service = CartService.new order
          cart_service.populate products: {product.id => product.master.id}, quantity: 1, distributor_id: distributor.id

          # Normally the controller would fire this event when the order's contents are changed
          fire_order_contents_changed_event(order.user, order)
        end.to change(Spree::Adjustment, :count).by(1)

        # And it should have the correct data
        order.reload
        adjustments = order.adjustments.where(:originator_type => 'EnterpriseFee')
        expect(adjustments.count).to eq 1
        adjustment = adjustments.first

        expect(adjustment.source).to eq order.line_items.last
        expect(adjustment.originator).to eq enterprise_fee
        expect(adjustment.label).to eq "Product distribution by #{distributor.name} for Pear"
        expect(adjustment.amount).to eq 1.23

        # TODO ROB this has an intermittent failure
        # And it should have some associated metadata
        md = adjustment.metadata
        expect(md.enterprise).to eq distributor
        expect(md.fee_name).to eq enterprise_fee.name
        expect(md.fee_type).to eq enterprise_fee.fee_type
        expect(md.enterprise_role).to eq 'distributor'
      end
    end

    describe "finding our adjustment for a line item" do
      it "returns nil when not present" do
        line_item = build(:line_item)
        pd = ProductDistribution.new
        expect(pd.send(:adjustment_for, line_item)).to be_nil
      end

      it "returns the adjustment when present" do
        pd = create(:product_distribution)
        line_item = create(:line_item)
        adjustment = pd.enterprise_fee.create_adjustment('foo', line_item.order, line_item, true)

        expect(pd.send(:adjustment_for, line_item)).to eq adjustment
      end

      it "raises an error when there are multiple adjustments for this enterprise fee" do
        pd = create(:product_distribution)
        line_item = create(:line_item)
        pd.enterprise_fee.create_adjustment('one', line_item.order, line_item, true)
        pd.enterprise_fee.create_adjustment('two', line_item.order, line_item, true)

        expect do
          pd.send(:adjustment_for, line_item)
        end.to raise_error "Multiple adjustments for this enterprise fee on this line item. This method is not designed to deal with this scenario."
      end
    end

    describe "creating an adjustment for a line item" do
      it "creates the adjustment via the enterprise fee" do
        pd = create(:product_distribution)
        pd.stub(:adjustment_label_for) { 'label' }
        line_item = create(:line_item)

        expect { pd.send(:create_adjustment_for, line_item) }.to change(Spree::Adjustment, :count).by(1)

        adjustment = Spree::Adjustment.last
        expect(adjustment.label).to eq 'label'
        expect(adjustment.adjustable).to eq line_item.order
        expect(adjustment.source).to eq line_item
        expect(adjustment.originator).to eq pd.enterprise_fee
        expect(adjustment).to be_mandatory

        md = adjustment.metadata
        expect(md.enterprise).to eq pd.distributor
        expect(md.fee_name).to eq pd.enterprise_fee.name
        expect(md.fee_type).to eq pd.enterprise_fee.fee_type
        expect(md.enterprise_role).to eq 'distributor'
      end
    end
  end


  private

  def fire_order_contents_changed_event(user, order)
    ActiveSupport::Notifications.instrument('spree.order.contents_changed', {user: user, order: order})
  end

end