Mostly Lazy DBIx::Class Testing
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Transcript of Mostly Lazy DBIx::Class Testing
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8/6/2019 Mostly Lazy DBIx::Class Testing
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Introduction Test::DBIx::Class::Schema Future Finally
Mostly Lazy DBIx::Class Testing
Chisel Wright
Net-A-Porter
2011
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Introduction Test::DBIx::Class::Schema Future Finally
In A Nutshell
DBIx::Class schema sanity checking tests
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Introduction Test::DBIx::Class::Schema Future Finally
Why?
Ongoing Quest To Be As LAZY As Possible
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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);
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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");}
}
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C S
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Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
What about ...? relationships
custom methods
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I d i T DBI Cl S h F Fi ll
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Introduction Test::DBIx::Class::Schema Future Finally
Non-Lazy
Decide to test something new?
How many .t files do you need to edit?
More than zero?
Too much work!!
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I t d ti T t DBI Cl S h F t Fi ll
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Introduction Test::DBIx::Class::Schema Future Finally
Getting Lazy
Test::DBIx::Class::Schema
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Introduction Test::DBIx::Class::Schema Future Finally
Test::DBIx::Class::Schema
My Attempt At Laziness
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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,});
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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( ) ],
});
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Introduction Test::DBIx::Class::Schema Future Finally
An example (running)
$schematest->run_tests();
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y
You get. . .
can ok( @columns )
can ok( @relations )
can ok( @customs ) # row subs
can ok( @resultsets ) # rs subs
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You also get. . .
$thing->$column called ok
$thing->$relation called ok
test that $column exists in the database ensure related-source exists
test self.* and foreign.* columns for relationships
test proxied relationships
PASS/FAIL for relationship validity
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You dont get
Functional Testing
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Benefits
only maintaining a list (or three)
lots of sanity checking
find out if someone deletes columns from the database
upgrading TDCS improves *.t files for free
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Recommendations
Test one table/class per file Use Test::Aggregate
Factor out ->new call for $schema
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In The Real World
on the CPAN since 2008
used in production code since 2009 recent burst of improvements
never used to test empty tables - OOPS! used to be quite basic
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Did It Work?
YES!IMNSHO
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What Next?
Wishlist
relationship reciprocity relationships that are coderefs
db columns that arent in the schema?
tie-in with DBIx::Class::Schema::Loader
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End Credits
QUESTIONS?
CPANID: CHISEL
github: github.com/chiselwright
Module: metacpan.org/release/Test-DBIx-Class-Schema
github.com/chiselwright/test-dbix-class-schema
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