test/test_history.rb

   1 require 'test/unit'
   2 require 'history'
   3
   4 class TestHistory < Test::Unit::TestCase
   5   def setup
   6     @history = History.new("initial_state")
   7   end
   8
   9   def test_initial_state
  10     assert_equal 0, @history.current
  11     assert_equal "initial_state", @history.state
  12     assert_nil @history.move
  13     assert_equal 1, @history.size
  14   end
  15
  16   def test_add_move
  17     @history.add_move("new_state", "first_move")
  18     assert_equal 1, @history.current
  19     assert_equal "new_state", @history.state
  20     assert_equal "first_move", @history.move
  21     assert_equal 2, @history.size
  22     @history.add_move("new_new_state", "second_move")
  23     assert_equal 2, @history.current
  24     assert_equal "new_new_state", @history.state
  25     assert_equal "second_move", @history.move
  26     assert_equal 3, @history.size
  27   end
  28
  29   def test_back_on_first
  30     assert_raise History::OutOfBound do
  31       @history.back
  32       assert_equal 0, @history.current
  33     end
  34   end
  35
  36   def test_forward_on_last
  37     @history.add_move("new_state", "first_move")
  38     assert_raise History::OutOfBound do
  39       @history.forward
  40       assert_equal 1, @history.current
  41     end
  42   end
  43
  44   def test_back
  45     @history.add_move("new_state", "first_move")
  46     @history.back
  47     assert_equal 0, @history.current
  48   end
  49
  50   def test_forward
  51     @history.add_move("new_state", "first_move")
  52     @history.back
  53     @history.forward
  54     assert_equal 1, @history.current
  55   end
  56
  57   def test_overwrite_moves
  58     @history.add_move("new_state1", "first_move1")
  59     @history.add_move("new_new_state1", "second_move1")
  60     @history.back
  61     @history.back
  62     @history.add_move("new_state2", "first_move2")
  63     assert_equal 1, @history.current
  64     assert_equal "new_state2", @history.state
  65     assert_equal "first_move2", @history.move
  66     assert_equal 2, @history.size
  67   end
  68 end