yapc::eu::2011 - mostly lazy dbix::class testing
DESCRIPTION
It's often useful to check that your DBIx::Class classes provide the methods you expect, and no-one has sneakily stolen or broken methods when you weren't looking. Being lazy I wanted to do this with as little fuss and typing as possible. Thanks to Test::DBIx::Class::Schema I can do all of the above and would like to share thoughts and musings for the future of the module.TRANSCRIPT
Introduction Test::DBIx::Class::Schema Future Finally
Mostly Lazy DBIx::Class Testing
Chisel Wright
Net-A-Porter
2011
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
In A Nutshell
DBIx::Class schema sanity checking tests
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Why?
Ongoing Quest To Be As LAZY As Possible
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
# are specific columns defined?
my $thingy = $model->resultset(’BigBagOfFail’);
my @columns = qw/id name department/);
can_ok($thingy, @columns);
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
foreach my $column (@columns) {
try {
$thingy->$column();
ok("called $column()");
}
catch($e) {
diag $e;
fail("$column() failed");
}
}
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
What about . . . ?
I relationships
I custom methods
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
I Decide to test something new?
I How many .t files do you need to edit?
I More than zero?
I Too much work!!
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Getting Lazy
Test::DBIx::Class::Schema
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Test::DBIx::Class::Schema
My Attempt At Laziness
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
An example (setup)
my $schematest = Test::DBIx::Class::Schema->new({
# required
dsn => ’dbi:Pg:dbname=mydb’,
namespace => ’MyDB::Schema’,
moniker => ’SomeTable’,
# optional
username => ’some_user’,
password => ’opensesame’,
});
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
An example (config)
# tell it what to test
$schematest->methods({
columns => [ qw( id name ) ],
relations => [ qw( foo ) ],
custom => [ qw( some_method ) ],
resultsets => [ qw( ) ],
});
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
An example (running)
$schematest->run_tests();
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
You get. . .
I can ok( @columns )
I can ok( @relations )
I can ok( @customs ) # row subs
I can ok( @resultsets ) # rs subs
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
You also get. . .
I $thing->$column called ok
I $thing->$relation called ok
I test that $column exists in the database
I ensure related-source exists
I test self.* and foreign.* columns for relationships
I test proxied relationships
I PASS/FAIL for relationship validity
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
You don’t get
Functional Testing
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Benefits
I only maintaining a list (or three)
I lots of sanity checking
I find out if someone deletes columns from the database
I upgrading ’TDCS’ improves *.t files for free
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Recommendations
I Test one table/class per file
I Use Test::Aggregate
I Factor out ->new call for $schema
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
In The Real World
I on the CPAN since 2008
I used in production code since 2009I recent burst of improvements
I never used to test empty tables - OOPS!I used to be quite basic
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
Did It Work?
YES!IMNSHO
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
What Next?
Wishlist
I relationship reciprocity
I relationships that are coderefs
I db columns that aren’t in the schema?
I tie-in with DBIx::Class::Schema::Loader
Mostly Lazy DBIx::Class Testing Net-A-Porter
Introduction Test::DBIx::Class::Schema Future Finally
End Credits
QUESTIONS?Me:
I CPANID: CHISEL
I github: github.com/chiselwright
Module:
I metacpan.org/release/Test-DBIx-Class-Schema
I github.com/chiselwright/test-dbix-class-schema
Mostly Lazy DBIx::Class Testing Net-A-Porter