require 'spec_helper'

describe OrderCycleDistributedVariants do
  let(:order) { double(:order) }
  let(:distributor) { double(:distributor) }
  let(:order_cycle) { double(:order_cycle) }
  let(:subject) { OrderCycleDistributedVariants.new(order_cycle, distributor) }
  let(:product) { double(:product) }

  describe "checking if an order can change to a specified new distribution" do
    it "returns false when a variant is not available for the specified distribution" do
      allow(order).to receive(:line_item_variants).and_return([1])
      allow(subject).to receive(:available_variants).and_return([])
      expect(subject.distributes_order_variants?(order)).to be false
    end

    it "returns true when all variants are available for the specified distribution" do
      allow(order).to receive(:line_item_variants).and_return([1])
      allow(subject).to receive(:available_variants).and_return([1])
      expect(subject.distributes_order_variants?(order)).to be true
    end
  end

  describe "finding variants that are available through a particular order cycle" do
    it "finds variants distributed by order cycle" do
      variant = double(:variant)
      allow(order_cycle).to receive(:variants_distributed_by).with(distributor).and_return([variant])

      expect(subject.available_variants).to eq [variant]
    end

    it "returns an empty array when order cycle is nil" do
      subject = OrderCycleDistributedVariants.new(nil, nil)
      expect(subject.available_variants).to eq []
    end
  end
end