test/test_history.rb

   1 # Copyright (c) 2009 Paolo Capriotti <p.capriotti@gmail.com>
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7
   8 require 'test/unit'
   9 require 'history'
  10
  11 class TestHistory < Test::Unit::TestCase
  12   def setup
  13     @history = History.new("initial_state")
  14   end
  15
  16   def test_initial_state
  17     assert_equal 0, @history.current
  18     assert_equal "initial_state", @history.state
  19     assert_nil @history.move
  20     assert_equal 1, @history.size
  21   end
  22
  23   def test_add_move
  24     @history.add_move("new_state", "first_move")
  25     assert_equal 1, @history.current
  26     assert_equal "new_state", @history.state
  27     assert_equal "first_move", @history.move
  28     assert_equal 2, @history.size
  29     @history.add_move("new_new_state", "second_move")
  30     assert_equal 2, @history.current
  31     assert_equal "new_new_state", @history.state
  32     assert_equal "second_move", @history.move
  33     assert_equal 3, @history.size
  34   end
  35
  36   def test_back_on_first
  37     assert_raise History::OutOfBound do
  38       @history.back
  39       assert_equal 0, @history.current
  40     end
  41   end
  42
  43   def test_forward_on_last
  44     @history.add_move("new_state", "first_move")
  45     assert_raise History::OutOfBound do
  46       @history.forward
  47       assert_equal 1, @history.current
  48     end
  49   end
  50
  51   def test_back
  52     @history.add_move("new_state", "first_move")
  53     @history.back
  54     assert_equal 0, @history.current
  55   end
  56
  57   def test_forward
  58     @history.add_move("new_state", "first_move")
  59     @history.back
  60     @history.forward
  61     assert_equal 1, @history.current
  62   end
  63
  64   def test_overwrite_moves
  65     @history.add_move("new_state1", "first_move1")
  66     @history.add_move("new_new_state1", "second_move1")
  67     @history.back
  68     @history.back
  69     @history.add_move("new_state2", "first_move2")
  70     assert_equal 1, @history.current
  71     assert_equal "new_state2", @history.state
  72     assert_equal "first_move2", @history.move
  73     assert_equal 2, @history.size
  74   end
  75 end