1Perl::Critic::TestUtilsU(s3e)r Contributed Perl DocumentaPteiroln::Critic::TestUtils(3)
2
6 Perl::Critic::TestUtils - Utility functions for testing new Policies.
7
9 This is considered to be a public module. Any changes to its interface
10 will go through a deprecation cycle.
11
13 use Perl::Critic::TestUtils qw(critique pcritique fcritique);
14 my $code = '<<END_CODE';
16 package Foo::Bar;
17 $foo = frobulator();
18 $baz = $foo ** 2;
19 1;
20 END_CODE
21 # Critique code against all loaded policies...
23 my $perl_critic_config = { -severity => 2 };
24 my $violation_count = critique( \$code, $perl_critic_config);
25 # Critique code against one policy...
27 my $custom_policy = 'Miscellanea::ProhibitFrobulation'
28 my $violation_count = pcritique( $custom_policy, \$code );
29 # Critique code against one filename-related policy...
31 my $custom_policy = 'Modules::RequireFilenameMatchesPackage'
32 my $violation_count = fcritique( $custom_policy, \$code, 'Foo/Bar.pm' );
33
35 This module is used by Perl::Critic only for self-testing. It provides
36 a few handy subroutines for testing new Perl::Critic::Policy modules.
37 Look at the test scripts that ship with Perl::Critic for more examples
38 of how to use these subroutines.
39
41 block_perlcriticrc()
42 If a user has a ~/.perlcriticrc file, this can interfere with
43 testing. This handy method disables the search for that file --
44 simply call it at the top of your .t program. Note that this is
45 not easily reversible, but that should not matter.
46 critique_with_violations( $code_string_ref, $config_ref )
48 Test a block of code against the specified Perl::Critic::Config
49 instance (or "undef" for the default). Returns the violations that
50 occurred.
51 critique( $code_string_ref, $config_ref )
53 Test a block of code against the specified Perl::Critic::Config
54 instance (or "undef" for the default). Returns the number of
55 violations that occurred.
56 pcritique_with_violations( $policy_name, $code_string_ref, $config_ref
58 )
59 Like "critique_with_violations()", but tests only a single policy
60 instead of the whole bunch.
61 pcritique( $policy_name, $code_string_ref, $config_ref )
63 Like "critique()", but tests only a single policy instead of the
64 whole bunch.
65 fcritique_with_violations( $policy_name, $code_string_ref, $filename,
67 $config_ref )
68 Like "pcritique_with_violations()", but pretends that the code was
69 loaded from the specified filename. This is handy for testing
70 policies like "Modules::RequireFilenameMatchesPackage" which care
71 about the filename that the source derived from.
72 The $filename parameter must be a relative path, not absolute. The
74 file and all necessary subdirectories will be created via
75 File::Temp and will be automatically deleted.
76 fcritique( $policy_name, $code_string_ref, $filename, $config_ref )
78 Like "pcritique()", but pretends that the code was loaded from the
79 specified filename. This is handy for testing policies like
80 "Modules::RequireFilenameMatchesPackage" which care about the
81 filename that the source derived from.
82 The $filename parameter must be a relative path, not absolute. The
84 file and all necessary subdirectories will be created via
85 File::Temp and will be automatically deleted.
86 subtests_in_tree( $dir )
88 Searches the specified directory recursively for .run files. Each
89 one found is parsed and a hash-of-list-of-hashes is returned. The
90 outer hash is keyed on policy short name, like
91 "Modules::RequireEndWithOne". The inner hash specifies a single
92 test to be handed to "pcritique()" or "fcritique()", including the
93 code string, test name, etc. See below for the syntax of the .run
94 files.
95 should_skip_author_tests()
97 Answers whether author tests should run.
98 get_author_test_skip_message()
100 Returns a string containing the message that should be emitted when
101 a test is skipped due to it being an author test when author tests
102 are not enabled.
103 starting_points_including_examples()
105 Returns a list of the directories contain code that needs to be
106 tested when it is desired that the examples be included.
107 bundled_policy_names()
109 Returns a list of Policy packages that come bundled with this
110 package. This functions by searching MANIFEST for
111 lib/Perl/Critic/Policy/*.pm and converts the results to package
112 names.
113 names_of_policies_willing_to_work( %configuration )
115 Returns a list of the packages of policies that are willing to
116 function on the current system using the specified configuration.
117
119 Testing a policy follows a very simple pattern:
120 * Policy name
122 * Subtest name
123 * Optional parameters
124 * Number of failures expected
125 * Optional exception expected
126 * Optional filename for code
127 Each of the subtests for a policy is collected in a single .run file,
129 with test properties as comments in front of each code block that
130 describes how we expect Perl::Critic to react to the code. For
131 example, say you have a policy called Variables::ProhibitVowels:
132 (In file t/Variables/ProhibitVowels.run)
134 ## name Basics
136 ## failures 1
137 ## cut
138 my $vrbl_nm = 'foo'; # Good, vowel-free name
140 my $wango = 12; # Bad, pronouncable name
141 ## name Sometimes Y
144 ## failures 1
145 ## cut
146 my $yllw = 0; # "y" not a vowel here
148 my $rhythm = 12; # But here it is
149 These are called "subtests", and two are shown above. The beauty of
151 incorporating multiple subtests in a file is that the .run is itself a
152 (mostly) valid Perl file, and not hidden in a HEREDOC, so your editor's
153 color-coding still works, and it is much easier to work with the code
154 and the POD.
155 If you need to pass any configuration parameters for your subtest, do
157 so like this:
158 ## parms { allow_y => '0' }
160 Note that all the values in this hash must be strings because that's
162 what Perl::Critic will hand you from a .perlcriticrc.
163 If it's a TODO subtest (probably because of some weird corner of PPI
165 that we exercised that Adam is getting around to fixing, right?), then
166 make a "##TODO" entry.
167 ## TODO Should pass when PPI 1.xxx comes out
169 If the code is expected to trigger an exception in the policy, indicate
171 that like so:
172 ## error 1
174 If you want to test the error message, mark it with "/.../" to indicate
176 a "like()" test:
177 ## error /Can't load Foo::Bar/
179 If the policy you are testing cares about the filename of the code, you
181 can indicate that "fcritique" should be used like so (see "fcritique"
182 for more details):
183 ## filename lib/Foo/Bar.pm
185 The value of "parms" will get "eval"ed and passed to "pcritique()", so
187 be careful.
188 In general, a subtest document runs from the "## cut" that starts it to
190 either the next "## name" or the end of the file. In very rare
191 circumstances you may need to end the test document earlier. A second
192 "## cut" will do this. The only known need for this is in
193 t/Miscellanea/RequireRcsKeywords.run, where it is used to prevent the
194 RCS keywords in the file footer from producing false positives or
195 negatives in the last test.
196 Note that nowhere within the .run file itself do you specify the policy
198 that you're testing. That's implicit within the filename.
199
201 Test that we have a t/*/*.run for each lib/*/*.pm
202 Allow us to specify the nature of the failures, and which one. If
204 there are 15 lines of code, and six of them fail, how do we know
205 they're the right six?
206
208 Chris Dolan <cdolan@cpan.org> and the rest of the Perl::Critic team.
209
211 Copyright (c) 2005-2009 Chris Dolan.
212 This program is free software; you can redistribute it and/or modify it
214 under the same terms as Perl itself. The full text of this license can
215 be found in the LICENSE file included with this module.
216perl v5.12.1 2010-09-08 Perl::Critic::TestUtils(3)