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1 | #!/usr/bin/perl |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
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6 | use Test::More tests => 34; |
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7 | use Test::Exception; |
8 | |
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9 | use Scalar::Util 'isweak'; |
10 | |
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11 | BEGIN { |
12 | use_ok('Moose'); |
13 | } |
14 | |
15 | { |
16 | package BinaryTree; |
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17 | use Moose; |
18 | |
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19 | has 'node' => (is => 'rw', isa => 'Any'); |
20 | |
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21 | has 'parent' => ( |
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22 | is => 'rw', |
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23 | isa => 'BinaryTree', |
24 | predicate => 'has_parent', |
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25 | weak_ref => 1, |
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26 | ); |
27 | |
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28 | has 'left' => ( |
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29 | is => 'rw', |
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30 | isa => 'BinaryTree', |
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31 | predicate => 'has_left', |
32 | lazy => 1, |
33 | default => sub { BinaryTree->new(parent => $_[0]) }, |
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34 | ); |
35 | |
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36 | has 'right' => ( |
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37 | is => 'rw', |
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38 | isa => 'BinaryTree', |
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39 | predicate => 'has_right', |
40 | lazy => 1, |
41 | default => sub { BinaryTree->new(parent => $_[0]) }, |
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42 | ); |
43 | |
44 | before 'right', 'left' => sub { |
45 | my ($self, $tree) = @_; |
46 | $tree->parent($self) if defined $tree; |
47 | }; |
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48 | |
49 | __PACKAGE__->meta->make_immutable(debug => 0); |
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50 | } |
51 | |
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52 | my $root = BinaryTree->new(node => 'root'); |
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53 | isa_ok($root, 'BinaryTree'); |
54 | |
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55 | is($root->node, 'root', '... got the right node value'); |
56 | |
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57 | ok(!$root->has_left, '... no left node yet'); |
58 | ok(!$root->has_right, '... no right node yet'); |
59 | |
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60 | ok(!$root->has_parent, '... no parent for root node'); |
61 | |
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62 | # make a left node |
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63 | |
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64 | my $left = $root->left; |
65 | isa_ok($left, 'BinaryTree'); |
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66 | |
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67 | is($root->left, $left, '... got the same node (and it is $left)'); |
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68 | ok($root->has_left, '... we have a left node now'); |
69 | |
70 | ok($left->has_parent, '... lefts has a parent'); |
71 | is($left->parent, $root, '... lefts parent is the root'); |
72 | |
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73 | ok(isweak($left->{parent}), '... parent is a weakened ref'); |
74 | |
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75 | ok(!$left->has_left, '... $left no left node yet'); |
76 | ok(!$left->has_right, '... $left no right node yet'); |
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77 | |
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78 | is($left->node, undef, '... left has got no node value'); |
79 | |
80 | lives_ok { |
81 | $left->node('left') |
82 | } '... assign to lefts node'; |
83 | |
84 | is($left->node, 'left', '... left now has a node value'); |
85 | |
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86 | # make a right node |
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87 | |
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88 | ok(!$root->has_right, '... still no right node yet'); |
89 | |
90 | is($root->right->node, undef, '... right has got no node value'); |
91 | |
92 | ok($root->has_right, '... now we have a right node'); |
93 | |
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94 | my $right = $root->right; |
95 | isa_ok($right, 'BinaryTree'); |
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96 | |
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97 | lives_ok { |
98 | $right->node('right') |
99 | } '... assign to rights node'; |
100 | |
101 | is($right->node, 'right', '... left now has a node value'); |
102 | |
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103 | is($root->right, $right, '... got the same node (and it is $right)'); |
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104 | ok($root->has_right, '... we have a right node now'); |
105 | |
106 | ok($right->has_parent, '... rights has a parent'); |
107 | is($right->parent, $root, '... rights parent is the root'); |
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108 | |
109 | ok(isweak($right->{parent}), '... parent is a weakened ref'); |
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110 | |
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111 | my $left_left = $left->left; |
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112 | isa_ok($left_left, 'BinaryTree'); |
113 | |
114 | ok($left_left->has_parent, '... left does have a parent'); |
115 | |
116 | is($left_left->parent, $left, '... got a parent node (and it is $left)'); |
117 | ok($left->has_left, '... we have a left node now'); |
118 | is($left->left, $left_left, '... got a left node (and it is $left_left)'); |
119 | |
120 | ok(isweak($left_left->{parent}), '... parent is a weakened ref'); |
121 | |