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