robot_spec.rb

require 'machine'
require 'robot'

describe Robot do
  before :each do
    @robot = Robot.new
  end

  describe 'when new' do
    it 'should have no location yet' do
      @robot.location.should be_nil
    end

    it 'should not point at a bin yet' do
      @robot.bin.should be_nil
    end
  end

  describe 'moving among machines' do
    before :each do
      @sorter = Machine.new("Sorter", "left")
      @oven = Machine.new("Oven", "middle")
    end

    it 'should report correct location' do
      @robot.move_to(@oven)
      @robot.location.should == @oven
    end

    describe 'picking' do
      before :each do
        @sorter.put("chips")
        @robot.move_to(@sorter)
        @robot.pick
      end

      it 'should have the correct bin' do
        @robot.bin.should == "chips"
      end

      it 'should have taken the bin away from the machine' do
        @sorter.bin.should be_nil
      end

      describe 'releasing' do
        before :each do
          @robot.move_to(@oven)
          @robot.release
        end

        it 'should have no bin' do
          @robot.bin.should be_nil
        end

        it 'should have deposited the bin at the oven' do
          @oven.bin.should == "chips"
        end
      end
    end
  end
end