require_relative "../helper"

class FakeBuilder
  attr_reader :built
  def add_code(ins)
    @built = ins
  end
end
module Risc
  class TestRegisterValue < MiniTest::Test

    def setup
      Risc.machine.boot
      @r0 = RegisterValue.new(:r0 , :Message)
      @r1 = RegisterValue.new(:r1 , :Space)
    end
    def test_r0
      assert_equal :r0 , @r0.symbol
    end
    def test_load_space
      move = @r0 << Parfait.object_space
      assert_equal LoadConstant , move.class
    end
    def test_load_symbol
      move = @r1 << :puts
      assert_equal LoadConstant , move.class
    end
    def test_transfer
      transfer = @r0 << @r1
      assert_equal Transfer , transfer.class
    end
    def test_calls_builder
      builder = FakeBuilder.new
      @r0.builder = builder
      @r0 << @r1
      assert_equal Transfer , builder.built.class
    end
    def test_index_op
      message = @r0[:first_message]
      assert_equal RValue , message.class
      assert_equal :first_message , message.index
      assert_equal @r0 , message.register
    end
    def test_slot_to_reg
      instr = @r0 << @r1[:first_message]
      assert_equal SlotToReg , instr.class
      assert_equal @r1 , instr.array
      assert_equal @r0 , instr.register
      assert_equal 3 , instr.index
    end
    def test_reg_to_slot
      instr = @r1[:first_message] << @r0
      assert_equal RegToSlot , instr.class
      assert_equal @r1 , instr.array
      assert_equal @r0 , instr.register
      assert_equal 3 , instr.index
    end
  end
end