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DBIx::Class::MigrationUsertContributed:Perlss::Migration::Tutorial::Testing(3)

NAME
       DBIx::Class::Migration::Tutorial::Testing - Test	Your Database

GOAL
       Let's take an interlude from creating migrations	and turn to writing
       test cases for your database.

       It would	help if	you are	familiar with Test::Most and Test::DBIx::Class
       and with	general	Perl testing procedures.  You could also benefit from
       reviewing our fixtures hook class
       Test::DBIx::Class::FixtureCommand::Population.

Test your 1-2 Upgrade
       When doing upgrades it would be great to	have some automated tests in
       place so	that whoever does the upgrade can immediately verify that all
       is well.	 Let's add a test case now!

	   touch t/upgrade-1to2.t

       Then open the new files in the editor of	choice and enter the following
       code:

	   #!/usr/bin/env perl

	   use Test::Most;
	   use Test::DBIx::Class
	     -schema_class=>'MusicBase::Schema',
	     -fixture_class => '::Population',
	     qw(Artist Country);

	   plan	skip_all => 'not correct schema	version'
	     if	Schema->schema_version != 2;

	   fixtures_ok ['all_tables'];

	   is Country->count, 3, 'Correct Number of Countries';
	   ok Artist->first->has_country, 'Artist has a	country';

	   done_testing;

       This creates a basic test case that only	runs for version 2 of the
       schema (this is just testing that the version 2 update was correct
       after all).  It uses Test::DBIx::Class to automatically deploy a
       temporary test database (by default it creates a	"SQLite" in-memory
       database) which reflects	the current schema and then we populate	the
       "all_tables" fixtures using the utility class
       DBIx::Class::Migration::Population which	is part	of the
       DBIx::Class::Migration distribution.  (In this case, since we are using
       Test::DBIx::Class, we are using the fixture hook
       Test::DBIx::Class::FixtureCommand::Population).

       Before we can run the test case,	we need	to update our "dist.ini" file.
       Open this is a text editor and change it	to look	like this:

	   name	   = DBIx-Class-Migration
	   author  = John Napiorkowski <jjnapiork@cpan.org>
	   license = Perl_5
	   copyright_holder = John Napiorkowski
	   copyright_year   = 2012
	   abstract = Tutorial Application for DBIx-Class-Migration

	   version = 0.001

	   [@Basic]
	   [Prereqs]
	   DBIx::Class = 0
	   DBIx::Class::Migration = 0

	   [Prereqs / TestRequires]
	   Test::Most =	0
	   Test::DBIx::Class = 0

       We just added a new section "[Prereqs / TestRequires]" and listed the
       two testing modules.  Great, now	install	the new	dependencies:

	   dzil	listdeps | cpanm

       Perfect,	we are now fully up to date and	anyone that checks out our
       code can	also be	sure to	have all the right dependencies.  Let's	run
       the test	case:

	   $ prove -lv t/upgrade-1to2.t
	   t/upgrade-1to2.t ..
	   Restored set	all_tables to database
	   ok 1	- Correct Number of Tests
	   ok 2	- Artist has a country
	   1..2
	   ok
	   All tests successful.
	   Files=1, Tests=2,  1	wallclock secs ( ... )
	   Result: PASS

       So hopefully that was easier database testing than you might be used
       too. :)

Additional Domain Logic	Testing
       Let's create another test for the Artist	ResultSet class.  You might
       have wondered about this	code, which you	added way back at the start of
       the tutorial:

       "lib/MusicBase/Schema/ResultSet/Artist.pm"

	   package MusicBase::Schema::ResultSet::Artist;

	   use strict;
	   use warnings;
	   use base 'DBIx::Class::ResultSet';

	   sub has_more_than_one_cds {
	     my	$me = (my $self	= shift)->current_source_alias;
	     $self->search(
	       {},
	       {
		 join=>['cd_rs'],
		 '+select'=> [ { count => 'cd_rs.cd_id', -as =>	'cd_count'} ],
		 '+as'=> ['cd_count'],
		 group_by=>["$me.artist_id"],
		 having	=> { cd_count => { '>',	1 } }
	       }
	     );
	   }

	   1;

       This is a bit of	logic that just	returns	the set	of Artist with more
       than one	cd.  This is the kind of custom	resultset logic	your
       application may require and therefore you should	have a test case.
       Let's build one:

	   touch t/more-than-1.t

       Then open "t/more-than-1.t" in your text	editor and add this code:

	   #!/usr/bin/env perl

	   use Test::Most;
	   use Test::DBIx::Class
	     -schema_class=>'MusicBase::Schema',
	     -fixture_class => '::Population',
	     qw(Artist);

	   fixtures_ok ['all_tables'];

	   ok my $more_than_one_rs =  Artist->has_more_than_one_cds,
	    'Got some artists';

	   is $more_than_one_rs->count,	1,
	     'Got expected number of artists with more than one	CD';

	   done_testing;

       If you go back to the original fixture data, you'll see we only have
       one Artist in the "all_tables" fixture set that has more	than one CD
       (Michael	Jackson).

       Obviously this is a pretty minimal test case, but it at least gets you
       started.	 let's run it:

	   $ prove -lv t/more-than-1.t
	   t/more-than-1.t ..
	   Restored set	all_tables to database
	   ok 1	- Got some artists
	   ok 2	- Got expected number of artists with more than	one CD
	   1..2
	   ok
	   All tests successful.
	   Files=1, Tests=2,  1	wallclock secs ( ... )
	   Result: PASS

       That's it for Testing!

SUMMARY
       This was	a short	section, but important.	 We explored how
       straightforward it is to	create meaningful test cases using our
       generated fixtures, if you use the right	tools to help you.  We also
       explored	the idea of limiting test cases	to certain database versions,
       which will be an	important thing	for you	to remember as you continue
       moving forward with your	database changes.

NEXT STEPS
       Proceed to DBIx::Class::Migration::Tutorial::ThirdMigration

AUTHOR
       See DBIx::Class::Migration for author information

COPYRIGHT & LICENSE
       See DBIx::Class::Migration for copyright	and license information

perl v5.32.1			  DBIx::Class::Migration::Tutorial::Testing(3)

NAME | GOAL | Test your 1-2 Upgrade | Additional Domain Logic Testing | SUMMARY | NEXT STEPS | AUTHOR | COPYRIGHT & LICENSE

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