Commit | Line | Data |
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1 | #!/usr/bin/perl |
2 | |
3 | use strict; |
4 | use warnings; |
5 | |
6 | use Test::More tests => 29; |
7 | |
8 | BEGIN { |
9 | use_ok('Moose::AttributeHelpers'); |
10 | } |
11 | |
12 | package Subject; |
13 | |
14 | use Moose::Role; |
15 | use Moose::AttributeHelpers; |
16 | |
17 | has observers => ( |
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18 | traits => [ 'Collection::Array' ], |
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19 | is => 'ro', |
20 | isa => 'ArrayRef[Observer]', |
21 | auto_deref => 1, |
22 | default => sub { [] }, |
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23 | handles => { |
24 | 'add_observer' => 'push', |
25 | 'count_observers' => 'count', |
26 | }, |
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27 | ); |
28 | |
29 | sub notify { |
30 | my ($self) = @_; |
31 | foreach my $observer ( $self->observers() ) { |
32 | $observer->update($self); |
33 | } |
34 | } |
35 | |
36 | ############################################################################### |
37 | |
38 | package Observer; |
39 | |
40 | use Moose::Role; |
41 | |
42 | requires 'update'; |
43 | |
44 | ############################################################################### |
45 | |
46 | package Counter; |
47 | |
48 | use Moose; |
49 | use Moose::AttributeHelpers; |
50 | |
51 | with 'Subject'; |
52 | |
53 | has count => ( |
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54 | traits => [ 'Counter' ], |
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55 | is => 'ro', |
56 | isa => 'Int', |
57 | default => 0, |
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58 | handles => { |
59 | inc_counter => 'inc', |
60 | dec_counter => 'dec', |
61 | }, |
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62 | ); |
63 | |
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64 | after qw(inc_counter dec_counter) => sub { |
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65 | my ($self) = @_; |
66 | $self->notify(); |
67 | }; |
68 | |
69 | ############################################################################### |
70 | |
71 | package Display; |
72 | |
73 | use Test::More; |
74 | |
75 | use Moose; |
76 | |
77 | with 'Observer'; |
78 | |
79 | sub update { |
80 | my ( $self, $subject ) = @_; |
81 | like $subject->count, qr{^-?\d+$}, 'Observed number ' . $subject->count; |
82 | } |
83 | |
84 | ############################################################################### |
85 | |
86 | package main; |
87 | |
88 | my $count = Counter->new(); |
89 | |
90 | ok($count->can('add_observer'), 'add_observer method added'); |
91 | |
92 | ok($count->can('count_observers'), 'count_observers method added'); |
93 | |
94 | ok($count->can('inc_counter'), 'inc_counter method added'); |
95 | |
96 | ok($count->can('dec_counter'), 'dec_counter method added'); |
97 | |
98 | $count->add_observer( Display->new() ); |
99 | |
100 | is($count->count_observers, 1, 'Only one observer'); |
101 | |
102 | is($count->count, 0, 'Default to zero'); |
103 | |
104 | $count->inc_counter; |
105 | |
106 | is($count->count, 1, 'Increment to one '); |
107 | |
108 | $count->inc_counter for (1 .. 6); |
109 | |
110 | is($count->count, 7, 'Increment up to seven'); |
111 | |
112 | $count->dec_counter; |
113 | |
114 | is($count->count, 6, 'Decrement to 6'); |
115 | |
116 | $count->dec_counter for (1 .. 5); |
117 | |
118 | is($count->count, 1, 'Decrement to 1'); |
119 | |
120 | $count->dec_counter for (1 .. 2); |
121 | |
122 | is($count->count, -1, 'Negative numbers'); |
123 | |
124 | $count->inc_counter; |
125 | |
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126 | is($count->count, 0, 'Back to zero'); |