1Test::Stream::Mock(3) User Contributed Perl DocumentationTest::Stream::Mock(3)
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NAME

6       Test::Stream::Mock - Module for managing mocked classes and instances.
7

DEPRECATED

9       This distribution is deprecated in favor of Test2, Test2::Suite, and
10       Test2::Workflow.
11
12       See Test::Stream::Manual::ToTest2 for a conversion guide.
13

DESCRIPTION

15       This module lets you add and override methods for any package
16       temporarily. When the instance is destroyed it will restore the package
17       to its original state.
18

SYNOPSIS

20           use Test::Stream::Mock;
21           use MyClass;
22
23           my $mock = Test::Stream::Mock->new(
24               class => 'MyClass',
25               override => [
26                   name => sub { 'fred' },
27                   ...
28               ],
29               add => [
30                   is_mocked => sub { 1 }
31                   ...
32               ],
33               ...
34           );
35
36           # Unmock the 'name' sub
37           $mock->restore('name');
38
39           ...
40
41           $mock = undef; # Will remove all the mocking
42

CONSTRUCTION

METHODS

45       $mock = $class->new(class => $CLASS, ...)
46           This will create a new instance of Test::Stream::Mock that manages
47           mocking for the specified $CLASS.
48
49           Any "Test::Stream::Mock" method can be used as a constructor
50           argument, each should be followed by an arrayref of arguments to be
51           used with the method. For instance the 'add' method:
52
53               my $mock = Test::Stream::Mock->new(
54                   class => 'AClass',
55                   add => [foo => sub { 'foo' }],
56               );
57
58           is identical to this:
59
60               my $mock = Test::Stream::Mock->new(
61                   class => 'AClass',
62               );
63               $mock->add(foo => sub { 'foo' });
64
65       $mock->add('symbol' => ..., 'synbol2' => ...)
66       $mock->override('symbol1' => ..., 'symbol2' => ...)
67           "add()" and "override()" are the primary ways to add/modify methods
68           for a class. Both accept the exact same type of arguments. The
69           difference is that "override" will fail unless the symbol you are
70           overriding already exists, "add" on the other hand will fail if the
71           symbol does already exist.
72
73           Note: Think of override as a push operation. If you call override
74           on the same symbol multiple times it will track that. You can use
75           "restore()" as a pop operation to go back to the previous mock.
76           "reset" can be used to remove all the mocking for a symbol.
77
78           Arguments must be a symbol name, with optional sigil, followed by a
79           new specification of the symbol. If no sigil is specified then '&'
80           (sub) is assumed. A simple example of overriding a sub:
81
82               $mock->override(foo => sub { 'overridden foo' });
83               my $val = $class->foo; # Runs our override
84               # $val is now set to 'overridden foo'
85
86           You can also simply provide a value and it will be wrapped in a sub
87           for you:
88
89               $mock->override( foo => 'foo' );
90
91           The example above will generate a sub that always returns the
92           string 'foo'.
93
94           There are 3 *special* values that can be used to generate
95           accessors:
96
97               $mock->add(
98                   name => 'rw',   # Generates a read/write accessor
99                   age  => 'ro',   # Generates a read only accessor
100                   size => 'wo',   # Generates a write only accessor
101               );
102
103           If you want to have a sub that actually returns on of the 3 special
104           strings, or that returns a coderef, you can use a hashref as the
105           spec:
106
107               my $ref = sub { 'my sub' };
108               $mock->add(
109                   rw_string => { val => 'rw' },
110                   ro_string => { val => 'ro' },
111                   wo_string => { val => 'wo' },
112                   coderef   => { val => $ref }, # the coderef method returns $ref each time
113               );
114
115           You can also override/add other symbol types, such as hash:
116
117               package Foo;
118               ...
119
120               $mock->add('%foo' => {a => 1});
121
122               print $Foo::foo{a}; # prints '1'
123
124           You can also tell mock to deduce the symbol type for the
125           add/override from the reference, rules are similar to glob
126           assignments:
127
128               $mock->add(
129                   -foo => sub { 'foo' },     # Adds the &foo sub to the package
130                   -foo => { foo => 1 },      # Adds the %foo hash to the package
131                   -foo => [ 'f', 'o', 'o' ], # Adds the @foo array to the package
132                   -foo => \"foo",            # Adds the $foo scalar to the package
133               );
134
135       $mock->restore($SYMBOL)
136           Restore the symbol to what it was before the last override. If the
137           symbol was recently added this will remove it. If the symbol has
138           been overriden multiple times this will ONLY restore it to the
139           previous state. Think of override as a push operation, this is the
140           pop operation.
141
142       $mock->reset($SYMBOL)
143           Remove all mocking of the symbol, restore the original symbol. If
144           the symbol was initially added then it will be completely removed.
145
146       $mock->orig($SYMBOL)
147           This will return the original symbol, before any mocking. For
148           symbols that were added this will return undef.
149
150       $mock->current($SYMBOL)
151           This will return the current symbol.
152
153       $mock->reset_all
154           Remove all added symbols, and restore all overriden symbols to
155           their originals.
156
157       $mock->add_constructor($NAME => $TYPE)
158       $mock->override_constructor($NAME => $TYPE)
159           This can be used to inject constructors. The first argument should
160           be the name of the constructor. The second argument specifies the
161           constructor type.
162
163           The "hash" type is the most common, all arguments are used to
164           create a new hash that is blessed.
165
166               hash => sub  {
167                   my ($class, %params) = @_;
168                   return bless \%params, $class;
169               };
170
171           The "array" type is similar to the hash type, but accepts a list
172           instead of key/value pairs:
173
174               array => sub {
175                   my ($class, @params) = @_;
176                   return bless \@params, $class;
177               };
178
179           The "ref" type takes a reference and blesses it. This will modify
180           your original input argument.
181
182               ref => sub {
183                   my ($class, $params) = @_;
184                   return bless $params, $class;
185               };
186
187           The "ref_copy" type will copy your reference and bless the copy:
188
189               ref_copy => sub {
190                   my ($class, $params) = @_;
191                   my $type = reftype($params);
192
193                   return bless {%$params}, $class
194                       if $type eq 'HASH';
195
196                   return bless [@$params], $class
197                       if $type eq 'ARRAY';
198
199                   croak "Not sure how to construct an '$class' from '$params'";
200               };
201
202       $mock->before($NAME, sub { ... })
203           This will replace the orignal sub $NAME with a new sub that calls
204           your custom code just before calling the original method. The
205           return from your custom sub is ignored. Your sub and the original
206           both get the unmodified arguments.
207
208       $mock->after($NAME, sub { ... })
209           This is similar to before, except your callback runs after the
210           original code.  The return from your callback is ignored.
211
212       $mock->around($NAME, sub { ... })
213           This gives you the chance to wrap the original sub:
214
215               $mock->around(foo => sub {
216                   my $orig = shift;
217                   my $self = shift;
218                   my (@args) = @_;
219
220                   ...
221                   $orig->(@args);
222                   ...
223
224                   return ...;
225               });
226
227           The original sub is passed in as the first argument, even before
228           $self. You are responsible for making sure your wrapper sub returns
229           the correct thing.
230
231       $mock->autoload
232           This will inject an "AUTOLOAD" sub into the class. This autoload
233           will automatically generate read-write accessors for any sub called
234           that does not already exist.
235
236       $mock->block_load
237           This will prevent the real class from loading until the mock is
238           destroyed. This will fail if the class is already loaded. This will
239           let you mock a class completely without loading the original
240           module.
241
242       $pm_file = $mock->file
243           This returns the relative path to the file for the module. This
244           corresponds to the %INC entry.
245
246       $bool = $mock->purge_on_destroy($bool)
247           When true, this will cause the package stash to be completely
248           obliterated when the mock object falls out of scope or is otherwise
249           destroyed. You do not normally want this.
250
251       $stash = $mock->stash
252           This returns the stash for the class being mocked. This is the
253           equivelent of:
254
255               my $stash = \%{"${class}\::"};
256
257           This saves you from needing to turn off strict.
258
259       $class = $mock->class
260           The class being mocked by this instance.
261
262       $p = $mock->parent
263           If you mock a class twice the first instance is the parent, the
264           second is the child. This prevents the parent from being destroyed
265           before the child, which would lead to a very unpleasant situation.
266
267       $c = $mock->child
268           Returns the child mock, if any.
269

SOURCE

271       The source code repository for Test::Stream can be found at
272       http://github.com/Test-More/Test-Stream/.
273

MAINTAINERS

275       Chad Granum <exodist@cpan.org>
276

AUTHORS

278       Chad Granum <exodist@cpan.org>
279
281       Copyright 2015 Chad Granum <exodist7@gmail.com>.
282
283       This program is free software; you can redistribute it and/or modify it
284       under the same terms as Perl itself.
285
286       See http://dev.perl.org/licenses/
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290perl v5.30.0                      2019-07-26             Test::Stream::Mock(3)
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