require 'test/unit'
load '../gol.rb'

class TestNil < Test::Unit::TestCase
  def setup
    @nil_hash = Hash.new
  end

  def test_nil_element_is_nil
    assert_nil @nil_hash['foo']['foo']
  end

  def test_nil_size_is_zero
    assert_equal 0, @nil_hash['foo'].size
  end
end

class TestGoL < Test::Unit::TestCase
  def setup
    @world = GoL.new
    @world.create(1,0)
  end

  def test_grid_exists
    assert_equal Hash, @world.grid.class
  end

  def test_cell_does_not_exist
    assert_nil @world.grid[1][1]
    assert_nil @world.grid[92][0]
  end

  def test_create
    @world.create(1,1)
    assert_equal true, @world.grid[1][1]
  end

  def test_destroy_with_one_cell
    @world.destroy(1,0)
    assert_equal 0, @world.grid[1].size
  end

  def test_destroy_with_two_cells
    @world.create(1,1)
    @world.destroy(1,0)
    assert_nil @world.grid[1][0]
    assert_equal true, @world.grid[1][1]
  end

  def test_zero_neighbor_count
    assert_equal 0, @world.neighbor_count(1,0)
  end

  def test_two_neighbor_count
    @world.create(1,1)
    @world.create(0,0)
    assert_equal 2, @world.neighbor_count(1,0)
  end

  def test_population_tick
    future = @world.poptick
    assert_equal @world.grid, future.grid
  end

  def test_eight_vacancy_count
    assert_equal 8, @world.vacancy_count(1,0)
  end

  def test_lonely_cell_dies
    @world.turn
    assert_nil @world.grid[1][0]
  end

=begin
  def test_crowded_cell_dies
    (1..2).each {|y| @world.create(1,y); @world.create(-1,y) }
    @world.turn
    assert_nil @world.grid[1][0]
  end

  def test_spousal_cell_lives
    @world.create(1,1)

    assert(
      @world.grid[1][0],
      "Expected #{@world.grid[1][0].inspect} to be true before turn."
    )

    @world.turn

    assert(
      @world.grid[1][0],
      "Expected #{@world.grid[1][0].inspect} to be true after turn."
    )
  end

  def test_family_cell_lives
    @world.create(1,1)
    @world.create(-1,1)

    assert(
      @world.grid[1][0],
      "Expected #{@world.grid[1][0].inspect} to be true before turn."
    )

    @world.turn

    assert(
      @world.grid[1][0],
      "Expected #{@world.grid[1][0].inspect} to be true after turn."
    )
  end
=end
end