Chris@909: #!/usr/bin/env ruby
Chris@909: 
Chris@909: # test_binarytree.rb
Chris@909: #
Chris@909: # $Revision: 1.5 $ by $Author: anupamsg $
Chris@909: # $Name:  $
Chris@909: #
Chris@909: # Copyright (c) 2006, 2007 Anupam Sengupta
Chris@909: #
Chris@909: # All rights reserved.
Chris@909: #
Chris@909: # Redistribution and use in source and binary forms, with or without modification,
Chris@909: # are permitted provided that the following conditions are met:
Chris@909: #
Chris@909: # - Redistributions of source code must retain the above copyright notice, this
Chris@909: #   list of conditions and the following disclaimer.
Chris@909: #
Chris@909: # - Redistributions in binary form must reproduce the above copyright notice, this
Chris@909: #   list of conditions and the following disclaimer in the documentation and/or
Chris@909: #   other materials provided with the distribution.
Chris@909: #
Chris@909: # - Neither the name of the organization nor the names of its contributors may
Chris@909: #   be used to endorse or promote products derived from this software without
Chris@909: #   specific prior written permission.
Chris@909: #
Chris@909: #   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
Chris@909: # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
Chris@909: # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
Chris@909: # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
Chris@909: # ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
Chris@909: # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
Chris@909: # LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
Chris@909: # ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
Chris@909: # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
Chris@909: # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Chris@909: #
Chris@909: 
Chris@909: require 'test/unit'
Chris@909: require 'tree/binarytree'
Chris@909: 
Chris@909: module TestTree
Chris@909:   # Test class for the Tree node.
Chris@909:   class TestBinaryTreeNode < Test::Unit::TestCase
Chris@909: 
Chris@909:     def setup
Chris@909:       @root = Tree::BinaryTreeNode.new("ROOT", "Root Node")
Chris@909: 
Chris@909:       @left_child1  = Tree::BinaryTreeNode.new("A Child at Left", "Child Node @ left")
Chris@909:       @right_child1 = Tree::BinaryTreeNode.new("B Child at Right", "Child Node @ right")
Chris@909: 
Chris@909:     end
Chris@909: 
Chris@909:     def teardown
Chris@909:       @root.remove!(@left_child1)
Chris@909:       @root.remove!(@right_child1)
Chris@909:       @root = nil
Chris@909:     end
Chris@909: 
Chris@909:     def test_initialize
Chris@909:       assert_not_nil(@root, "Binary tree's Root should have been created")
Chris@909:     end
Chris@909: 
Chris@909:     def test_add
Chris@909:       @root.add  @left_child1
Chris@909:       assert_same(@left_child1, @root.leftChild, "The left node should be left_child1")
Chris@909:       assert_same(@left_child1, @root.firstChild, "The first node should be left_child1")
Chris@909: 
Chris@909:       @root.add @right_child1
Chris@909:       assert_same(@right_child1, @root.rightChild, "The right node should be right_child1")
Chris@909:       assert_same(@right_child1, @root.lastChild, "The first node should be right_child1")
Chris@909: 
Chris@909:       assert_raise RuntimeError do
Chris@909:         @root.add Tree::BinaryTreeNode.new("The third child!")
Chris@909:       end
Chris@909: 
Chris@909:       assert_raise RuntimeError do
Chris@909:         @root << Tree::BinaryTreeNode.new("The third child!")
Chris@909:       end
Chris@909:     end
Chris@909: 
Chris@909:     def test_leftChild
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909:       assert_same(@left_child1, @root.leftChild, "The left child should be 'left_child1")
Chris@909:       assert_not_same(@right_child1, @root.leftChild, "The right_child1 is not the left child")
Chris@909:     end
Chris@909: 
Chris@909:     def test_rightChild
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909:       assert_same(@right_child1, @root.rightChild, "The right child should be 'right_child1")
Chris@909:       assert_not_same(@left_child1, @root.rightChild, "The left_child1 is not the left child")
Chris@909:     end
Chris@909: 
Chris@909:     def test_leftChild_equals
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909:       assert_same(@left_child1, @root.leftChild, "The left child should be 'left_child1")
Chris@909: 
Chris@909:       @root.leftChild = Tree::BinaryTreeNode.new("New Left Child")
Chris@909:       assert_equal("New Left Child", @root.leftChild.name, "The left child should now be the new child")
Chris@909:       assert_equal("B Child at Right", @root.lastChild.name, "The last child should now be the right child")
Chris@909: 
Chris@909:       # Now set the left child as nil, and retest
Chris@909:       @root.leftChild = nil
Chris@909:       assert_nil(@root.leftChild, "The left child should now be nil")
Chris@909:       assert_nil(@root.firstChild, "The first child is now nil")
Chris@909:       assert_equal("B Child at Right", @root.lastChild.name, "The last child should now be the right child")
Chris@909:     end
Chris@909: 
Chris@909:     def test_rightChild_equals
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909:       assert_same(@right_child1, @root.rightChild, "The right child should be 'right_child1")
Chris@909: 
Chris@909:       @root.rightChild = Tree::BinaryTreeNode.new("New Right Child")
Chris@909:       assert_equal("New Right Child", @root.rightChild.name, "The right child should now be the new child")
Chris@909:       assert_equal("A Child at Left", @root.firstChild.name, "The first child should now be the left child")
Chris@909:       assert_equal("New Right Child", @root.lastChild.name, "The last child should now be the right child")
Chris@909: 
Chris@909:       # Now set the right child as nil, and retest
Chris@909:       @root.rightChild = nil
Chris@909:       assert_nil(@root.rightChild, "The right child should now be nil")
Chris@909:       assert_equal("A Child at Left", @root.firstChild.name, "The first child should now be the left child")
Chris@909:       assert_nil(@root.lastChild, "The first child is now nil")
Chris@909:     end
Chris@909: 
Chris@909:     def test_isLeftChild_eh
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909: 
Chris@909:       assert(@left_child1.isLeftChild?, "left_child1 should be the left child")
Chris@909:       assert(!@right_child1.isLeftChild?, "left_child1 should be the left child")
Chris@909: 
Chris@909:       # Now set the right child as nil, and retest
Chris@909:       @root.rightChild = nil
Chris@909:       assert(@left_child1.isLeftChild?, "left_child1 should be the left child")
Chris@909: 
Chris@909:       assert(!@root.isLeftChild?, "Root is neither left child nor right")
Chris@909:     end
Chris@909: 
Chris@909:     def test_isRightChild_eh
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909: 
Chris@909:       assert(@right_child1.isRightChild?, "right_child1 should be the right child")
Chris@909:       assert(!@left_child1.isRightChild?, "right_child1 should be the right child")
Chris@909: 
Chris@909:       # Now set the left child as nil, and retest
Chris@909:       @root.leftChild = nil
Chris@909:       assert(@right_child1.isRightChild?, "right_child1 should be the right child")
Chris@909:       assert(!@root.isRightChild?, "Root is neither left child nor right")
Chris@909:     end
Chris@909: 
Chris@909:     def test_swap_children
Chris@909:       @root << @left_child1
Chris@909:       @root << @right_child1
Chris@909: 
Chris@909:       assert(@right_child1.isRightChild?, "right_child1 should be the right child")
Chris@909:       assert(!@left_child1.isRightChild?, "right_child1 should be the right child")
Chris@909: 
Chris@909:       @root.swap_children
Chris@909: 
Chris@909:       assert(@right_child1.isLeftChild?, "right_child1 should now be the left child")
Chris@909:       assert(@left_child1.isRightChild?, "left_child1 should now be the right child")
Chris@909:       assert_equal(@right_child1, @root.firstChild, "right_child1 should now be the first child")
Chris@909:       assert_equal(@left_child1, @root.lastChild, "left_child1 should now be the last child")
Chris@909:       assert_equal(@right_child1, @root[0], "right_child1 should now be the first child")
Chris@909:       assert_equal(@left_child1, @root[1], "left_child1 should now be the last child")
Chris@909:     end
Chris@909:   end
Chris@909: end
Chris@909: 
Chris@909: # $Log: test_binarytree.rb,v $
Chris@909: # Revision 1.5  2007/12/22 00:28:59  anupamsg
Chris@909: # Added more test cases, and enabled ZenTest compatibility.
Chris@909: #
Chris@909: # Revision 1.4  2007/12/18 23:11:29  anupamsg
Chris@909: # Minor documentation changes in the binarytree class.
Chris@909: #
Chris@909: # Revision 1.3  2007/10/02 03:07:30  anupamsg
Chris@909: # * Rakefile: Added an optional task for rcov code coverage.
Chris@909: #
Chris@909: # * test/test_binarytree.rb: Removed the unnecessary dependency on "Person" class.
Chris@909: #
Chris@909: # * test/test_tree.rb: Removed dependency on the redundant "Person" class.
Chris@909: #
Chris@909: # Revision 1.2  2007/08/30 22:06:13  anupamsg
Chris@909: # Added a new swap_children method for the Binary Tree class.
Chris@909: # Also made minor documentation updates and test additions.
Chris@909: #
Chris@909: # Revision 1.1  2007/07/21 04:52:37  anupamsg
Chris@909: # Renamed the test files.
Chris@909: #
Chris@909: # Revision 1.4  2007/07/19 02:03:57  anupamsg
Chris@909: # Minor syntax correction.
Chris@909: #
Chris@909: # Revision 1.3  2007/07/19 02:02:12  anupamsg
Chris@909: # Removed useless files (including rdoc, which should be generated for each release.
Chris@909: #
Chris@909: # Revision 1.2  2007/07/18 20:15:06  anupamsg
Chris@909: # Added two predicate methods in BinaryTreeNode to determine whether a node
Chris@909: # is a left or a right node.
Chris@909: #