test/interaction/test_operation_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 'interaction/operation_history'
  10
  11 class TestOperationHistory < Test::Unit::TestCase
  12   def setup
  13     @operations = OperationHistory.new
  14   end
  15
  16   def test_initial_state
  17     assert_equal 0, @operations.size
  18     assert_equal -1, @operations.current
  19   end
  20
  21   def test_add_operation
  22     @operations << 'op'
  23     assert_equal 1, @operations.size
  24     assert_equal 0, @operations.current
  25   end
  26
  27   def test_add_then_undo
  28     @operations << 'op'
  29     assert_equal 'op', @operations.undo_operation
  30     assert_equal 1, @operations.size
  31     assert_equal -1, @operations.current
  32   end
  33
  34   def test_undo_at_beginning
  35     @operations << 'op'
  36     assert_equal 'op', @operations.undo_operation
  37     assert_nil @operations.undo_operation
  38   end
  39
  40   def test_add_undo_redo
  41     @operations << 'op'
  42     assert_equal 'op', @operations.undo_operation
  43     assert_equal 'op', @operations.redo_operation
  44     assert_equal 1, @operations.size
  45     assert_equal 0, @operations.current
  46   end
  47
  48   def test_navigate
  49     (1..10).each do |i|
  50       @operations << "op#{i}"
  51     end
  52     assert_equal 10, @operations.size
  53     assert_equal 9, @operations.current
  54
  55     3.times { @operations.undo_operation }
  56
  57     assert_equal 6, @operations.current
  58
  59     assert_equal "op8", @operations.redo_operation
  60     assert_equal "op9", @operations.redo_operation
  61
  62     @operations.undo_operation
  63
  64     assert_equal "op9", @operations.redo_operation
  65     assert_equal "op10", @operations.redo_operation
  66
  67     assert_equal 9, @operations.current
  68   end
  69
  70   def test_redo_after_move
  71     @operations << "move"
  72     assert_equal 1, @operations.size
  73     assert_equal 0, @operations.current
  74     @operations.undo_operation
  75     assert_equal 1, @operations.size
  76     assert_equal -1, @operations.current
  77     @operations << "move"
  78     assert_equal 1, @operations.size
  79     assert_equal 0, @operations.current
  80   end
  81 end