Struct prototyping

convoy_spec.rb

require 'spec_helper'

RSpec.describe Convoy do
  it 'has wayponts' do
    Convoyy = Struct.new(:waypoints) do
      def replace_waypoint(old_waypoint_step_number, new_waypoints)
        waypoints
          .select { |waypoint| old_waypoint_step_number <= waypoint.step_number }
          .map { |waypoint| waypoint.active = false }

        waypoints.push(*new_waypoints)
      end
    end

    Waypoint = Struct.new(:creator, :node, :step_number, :active, :created_at)

    # Initial path:     Paris, Clermont, Mende, Nimes.
    # Replacement path: Paris, Clermont, Lyon, Nimes.
    time     = Time.new(2015, 1, 13, 12)
    paris    = Waypoint.new('Corwin', 'Paris', 1, true, time)
    clermont = Waypoint.new('Corwin', 'Lyon', 2, true, time)
    mende    = Waypoint.new('Corwin', 'Mende', 3, true, time)
    nimes    = Waypoint.new('Corwin', 'Nimes', 4, true, time)
    lyon     = Waypoint.new('Corwin', 'Lyon', 3, true, time + 30.minutes)
    nimes_2  = Waypoint.new('Mandor', 'Nimes', 4, true, time + 30.minutes)

    convoy = Convoyy.new([ paris, clermont, mende, nimes ])
    convoy.replace_waypoint(3, [ lyon, nimes_2 ] )

    expect(convoy.waypoints.size).to eq(6)
    expect(convoy.waypoints[2]).to eq(mende)
    expect(convoy.waypoints[2].active).to eq(false)
    expect(convoy.waypoints[3]).to eq(nimes)
    expect(convoy.waypoints[3].active).to eq(false)
    expect(convoy.waypoints[4]).to eq(lyon)
    expect(convoy.waypoints[5]).to eq(nimes_2)
  end
end