planet_express_express/spec/planet_express_express_spec.rb

# frozen_string_literal: true

RSpec.describe PlanetExpressExpress do
  it "calculates the shipment discounts and formats them properly" do
    input_file = File.open(
      File.expand_path("../fixtures/input.txt", __FILE__),
      "r"
    )

    output = StringIO.new

    PlanetExpressExpress::ShipmentReader.new(PlanetExpressExpress::PRICE_LIST).read_shipments(input_file) do |shipments|
      PlanetExpressExpress::Rules.new(PlanetExpressExpress::PRICE_LIST).apply_rules(shipments)
      PlanetExpressExpress::DiscountBudget.new(PlanetExpressExpress::DISCOUNT_LIMIT).limit_discounts(shipments)
      PlanetExpressExpress::Formatter.new(output).format(shipments)
    end

    expected_output = File.read(
      File.expand_path("../fixtures/output.txt", __FILE__)
    )

    output.rewind
    expect(output.read).to match(expected_output)
  end
end