defmodule AssemblerTest do
  use ExUnit.Case
  doctest Assembler

  test "assembles empty program" do
    assert Assembler.assemble("") == []
  end

  test "assembles simple program" do
    program = """
      add 1, 2, 10
      mul 2, 3, 11
      add $10, $11, 12
      hlt
    """

    assert Assembler.assemble(program) == [
             1101,
             1,
             2,
             10,
             1102,
             2,
             3,
             11,
             1,
             10,
             11,
             12,
             99
           ]
  end

  test "assembles simple program with a label" do
    program = """
      add 1, 2, 10
      jnz $10, nonZero
    nonZero:
      hlt
    """

    assert Assembler.assemble(program) == [
             1101,
             1,
             2,
             10,
             1005,
             10,
             7,
             99
           ]
  end

  test "assembles a simple program with a data label" do
    program = """
      add 1, 2, var
      out $var
    var: 0
    """

    assert Assembler.assemble(program) == [
             1101,
             1,
             2,
             6,
             4,
             6,
             0
           ]
  end

  test "assembles a program with a _self label" do
    program = """
      add 1, 2, _self
    """

    assert Assembler.assemble(program) == [1101, 1, 2, 3]
  end
end