1Test::Roo::Cookbook(3)User Contributed Perl DocumentationTest::Roo::Cookbook(3)
2
6 Test::Roo::Cookbook - Test::Roo examples
7
9 version 1.004
10
12 This file offers usage ideas and examples for Test::Roo.
13
15 Self-contained test file
16 A single test file could be used for simple tests where you want to use
17 Moo attributes for fixtures that get used by test blocks.
18 Here is an example that requires a "corpus" attribute, stores lines
20 from that file in the "lines" attribute and makes it available to all
21 test blocks:
22 # examples/cookbook/single_file.t
24 use Test::Roo;
26 use MooX::Types::MooseLike::Base qw/ArrayRef/;
28 use Path::Tiny;
29 has corpus => (
31 is => 'ro',
32 isa => sub { -f shift },
33 required => 1,
34 );
35 has lines => (
37 is => 'lazy',
38 isa => ArrayRef,
39 );
40 sub _build_lines {
42 my ($self) = @_;
43 return [ map { lc } path( $self->corpus )->lines ];
44 }
45 test 'sorted' => sub {
47 my $self = shift;
48 is_deeply( $self->lines, [ sort @{$self->lines} ], "alphabetized");
49 };
50 test 'a to z' => sub {
52 my $self = shift;
53 my %letters = map { substr($_,0,1) => 1 } @{ $self->lines };
54 is_deeply( [sort keys %letters], ["a" .. "z"], "all letters found" );
55 };
56 run_me( { corpus => "/usr/share/dict/words" } );
59 # ... test other corpuses ...
60 done_testing;
62 Standalone test class
64 You don't have to put the test class into the .t file. It's just a
65 class.
66 Here is the same corpus checking example as before, but now as a class:
68 # examples/cookbook/lib/CorpusCheck.pm
70 package CorpusCheck;
72 use Test::Roo;
73 use MooX::Types::MooseLike::Base qw/ArrayRef/;
75 use Path::Tiny;
76 has corpus => (
78 is => 'ro',
79 isa => sub { -f shift },
80 required => 1,
81 );
82 has lines => (
84 is => 'lazy',
85 isa => ArrayRef,
86 );
87 sub _build_lines {
89 my ($self) = @_;
90 return [ map { lc } path( $self->corpus )->lines ];
91 }
92 test 'sorted' => sub {
94 my $self = shift;
95 is_deeply( $self->lines, [ sort @{$self->lines} ], "alphabetized");
96 };
97 test 'a to z' => sub {
99 my $self = shift;
100 my %letters = map { substr($_,0,1) => 1 } @{ $self->lines };
101 is_deeply( [sort keys %letters], ["a" .. "z"], "all letters found" );
102 };
103 1;
105 Running it from a .t file doesn't even need Test::Roo:
107 # examples/cookbook/standalone.t
109 use strictures;
111 use Test::More;
112 use lib 'lib';
114 use CorpusCheck;
115 CorpusCheck->run_tests({ corpus => "/usr/share/dict/words" });
117 done_testing;
119 Standalone Test Roles
121 The real power of Test::Roo is decomposing test behaviors into roles
122 that can be reused.
123 Imagine we want to test a file-finder module like Path::Iterator::Rule.
125 We could put tests for it into a role, then run the tests from a file
126 that composes that role. For example, here would be the test file:
127 # examples/cookbook/test-pir.pl
129 use Test::Roo;
131 use lib 'lib';
133 with 'IteratorTest';
135 run_me(
137 {
138 iterator_class => 'Path::Iterator::Rule',
139 result_type => '',
140 }
141 );
142 done_testing;
144 Then in the distribution for Path::Class::Rule, the same role could be
146 tested with a test file like this:
147 # examples/cookbook/test-pcr.pl
149 use Test::Roo;
151 use lib 'lib';
153 with 'IteratorTest';
155 run_me(
157 {
158 iterator_class => 'Path::Class::Rule',
159 result_type => 'Path::Class::Entity',
160 },
161 );
162 done_testing;
164 What is the common role that they are consuming? It sets up a test
166 directory, creates files and runs tests:
167 # examples/cookbook/lib/IteratorTest.pm
169 package IteratorTest;
171 use Test::Roo::Role;
172 use MooX::Types::MooseLike::Base qw/:all/;
174 use Class::Load qw/load_class/;
175 use Path::Tiny;
176 has [qw/iterator_class result_type/] => (
178 is => 'ro',
179 isa => Str,
180 required => 1,
181 );
182 has test_files => (
184 is => 'ro',
185 isa => ArrayRef,
186 default => sub {
187 return [
188 qw(
189 aaaa
190 bbbb
191 cccc/dddd
192 eeee/ffff/gggg
193 )
194 ];
195 },
196 );
197 has tempdir => (
199 is => 'lazy',
200 isa => InstanceOf ['Path::Tiny']
201 );
202 has rule_object => (
204 is => 'lazy',
205 isa => Object,
206 clearer => 1,
207 );
208 sub _build_description { return shift->iterator_class }
210 sub _build_tempdir {
212 my ($self) = @_;
213 my $dir = Path::Tiny->tempdir;
214 $dir->child($_)->touchpath for @{ $self->test_files };
215 return $dir;
216 }
217 sub _build_rule_object {
219 my ($self) = @_;
220 load_class( $self->iterator_class );
221 return $self->iterator_class->new;
222 }
223 sub test_result_type {
225 my ( $self, $file ) = @_;
226 if ( my $type = $self->result_type ) {
227 isa_ok( $file, $type, $file );
228 }
229 else {
230 is( ref($file), '', "$file is string" );
231 }
232 }
233 test 'find files' => sub {
235 my $self = shift;
236 $self->clear_rule_object; # make sure have a new one each time
237 $self->tempdir;
239 my $rule = $self->rule_object;
240 my @files = $rule->file->all( $self->tempdir, { relative => 1 } );
241 is_deeply( \@files, $self->test_files, "correct list of files" )
243 or diag explain \@files;
244 $self->test_result_type($_) for @files;
246 };
247 # ... more tests ...
249 1;
251
253 Skipping all tests
254 If you need to skip all tests in the .t file because some prerequisite
255 isn't available or some fixture couldn't be built, use a "BUILD" method
256 and call "plan skip_all => $reason".
257 use Class::Load qw/try_load_class/;
259 has fixture => (
261 is => 'lazy',
262 );
263 sub _build_fixture {
265 # ... something that might die if unavailable ...
266 }
267 sub BUILD {
269 my ($self) = @_;
270 try_load_class('Class::Name')
272 or plan skip_all => "Class::Name required to run these tests";
273 eval { $self->fixture }
275 or plan skip_all => "Couldn't build fixture";
276 }
277 Setting a test description
279 You can override "_build_description" to create a test description
280 based on other attributes. For example, the "IteratorTest" package
281 earlier had these lines:
282 has [qw/iterator_class result_type/] => (
284 is => 'ro',
285 isa => Str,
286 required => 1,
287 );
288 sub _build_description { return shift->iterator_class }
290 The "iterator_class" attribute is required and then the description is
292 set to it. Or, there could be a more verbose description:
293 sub _build_description {
295 my $name = shift->iterator_class;
296 return "Testing the $name class"
297 }
298 Requiring a builder
300 A test role can specify a lazy attribute and then require the consuming
301 class to provide a builder for it.
302 In the test role:
304 has fixture => (
306 is => 'lazy',
307 );
308 requires '_build_fixture';
310 In the consuming class:
312 sub _build_fixture { ... }
314 Clearing fixtures
316 If a fixture has a clearer method, it can be easily reset during
317 testing. This works really well with lazy attributes which get
318 regenerated on demand.
319 has fixture => (
321 is => 'lazy',
322 clearer => 1,
323 );
324 test "some test" => sub {
326 my $self = shift;
327 $self->clear_fixture;
328 ...
329 };
330
332 Setting up a fixture before testing
333 When you need to do some extra work to set up a fixture, you can put a
334 method modifier on the "setup" method. In some cases, this is more
335 intuitive than doing all the work in an attribute builder.
336 Here is an example that creates an SQLite table before any tests are
338 run and cleans up afterwards:
339 # example/cookbook/sqlite.t
341 use Test::Roo;
343 use DBI;
344 use Path::Tiny;
345 has tempdir => (
347 is => 'ro',
348 clearer => 1,
349 default => sub { Path::Tiny->tempdir },
350 );
351 has dbfile => (
353 is => 'lazy',
354 default => sub { shift->tempdir->child('test.sqlite3') },
355 );
356 has dbh => ( is => 'lazy', );
358 sub _build_dbh {
360 my $self = shift;
361 DBI->connect(
362 "dbi:SQLite:dbname=" . $self->dbfile, { RaiseError => 1 }
363 );
364 }
365 before 'setup' => sub {
367 my $self = shift;
368 $self->dbh->do("CREATE TABLE f (f1, f2, f3)");
369 };
370 after 'teardown' => sub { shift->clear_tempdir };
372 test 'first' => sub {
374 my $self = shift;
375 my $dbh = $self->dbh;
376 my $sth = $dbh->prepare("INSERT INTO f(f1,f2,f3) VALUES (?,?,?)");
377 ok( $sth->execute( "one", "two", "three" ), "inserted data" );
378 my $got = $dbh->selectrow_arrayref("SELECT * FROM f");
380 is_deeply( $got, [qw/one two three/], "read data" );
381 };
382 run_me;
384 done_testing;
385 Running tests during setup and teardown
387 You can run any tests you like during setup or teardown. The previous
388 example could have written the setup and teardown hooks like this:
389 before 'setup' => sub {
391 my $self = shift;
392 ok( ! -f $self->dbfile, "test database file not created" );
393 ok( $self->dbh->do("CREATE TABLE f (f1, f2, f3)"), "created table");
394 ok( -f $self->dbfile, "test database file exists" );
395 };
396 after 'teardown' => sub {
398 my $self = shift;
399 my $dir = $self->tempdir;
400 $self->clear_tempdir;
401 ok( ! -f $dir, "tempdir cleaned up");
402 };
403
405 Global modifiers with "each_test"
406 Modifying "each_test" triggers methods before or after every test block
407 defined with the "test" function. Because this affects all tests,
408 whether from the test class or composed from roles, it needs to be used
409 thoughtfully.
410 Here is an example that ensures that every test block is run in its own
412 separate temporary directory.
413 # examples/cookbook/with_tempd.t
415 use Test::Roo;
417 use File::pushd qw/tempd/;
418 use Cwd qw/getcwd/;
419 has tempdir => (
421 is => 'lazy',
422 isa => sub { shift->isa('File::pushd') },
423 clearer => 1,
424 );
425 # tempd changes directory until the object is destroyed
427 # and the fixture caches the object until cleared
428 sub _build_tempdir { return tempd() }
429 # building attribute will change to temp directory
431 before each_test => sub { shift->tempdir };
432 # clearing attribute will change to original directory
434 after each_test => sub { shift->clear_tempdir };
435 # do stuff in a temp directory
437 test 'first test' => sub {
438 my $self = shift;
439 is( $self->tempdir, getcwd(), "cwd is " . $self->tempdir );
440 # ... more tests ...
441 };
442 # do stuff in a separate, fresh temp directory
444 test 'second test' => sub {
445 my $self = shift;
446 is( $self->tempdir, getcwd(), "cwd is " . $self->tempdir );
447 # ... more tests ...
448 };
449 run_me;
451 done_testing;
452 Individual test modifiers
454 If you want to have method modifiers on an individual test, put your
455 Test::More tests in a method, add modifiers to that method, and use
456 "test" to invoke it.
457 # examples/cookbook/hookable_test.t
459 use Test::Roo;
461 has counter => ( is => 'rw', default => sub { 0 } );
463 sub is_positive {
465 my $self = shift;
466 ok( $self->counter > 0, "counter is positive" );
467 }
468 before is_positive => sub { shift->counter( 1 ) };
470 test 'hookable' => sub { shift->is_positive };
472 run_me;
474 done_testing;
475 Wrapping tests
477 As a middle ground between global and individual modifiers, if you need
478 to call some code repeatedly for some, but not all all tests, you can
479 create a custom test function. This might make sense for only a few
480 tests, but could be helpful if there are many that need similar
481 behavior, but you can't make it global by modifying "each_test".
482 The following example clears the fixture before tests defined with the
484 "fresh_test" function.
485 # examples/cookbook/wrapped.t
487 use strict;
489 use Test::Roo;
490 has fixture => (
492 is => 'rw',
493 lazy => 1,
494 builder => 1,
495 clearer => 1,
496 );
497 sub _build_fixture { "Hello World" }
499 sub fresh_test {
501 my ($name, $code) = @_;
502 test $name, sub {
503 my $self = shift;
504 $self->clear_fixture;
505 $code->($self);
506 };
507 }
508 fresh_test 'first' => sub {
510 my $self = shift;
511 is ( $self->fixture, 'Hello World', "fixture has default" );
512 $self->fixture("Goodbye World");
513 };
514 fresh_test 'second' => sub {
516 my $self = shift;
517 is ( $self->fixture, 'Hello World', "fixture has default" );
518 };
519 run_me;
521 done_testing;
522
524 David Golden <dagolden@cpan.org>
525
527 This software is Copyright (c) 2013 by David Golden.
528 This is free software, licensed under:
530 The Apache License, Version 2.0, January 2004
532perl v5.32.0 2020-07-28 Test::Roo::Cookbook(3)