intermediate perl testing (or, let's not make a mess of things, shall we?)

Intermediate Perl Testing(or, Let’s Not Make A Mess Of Things, Shall We?)

Josh Heumann

Have you seen these tests?is_deeply( get_recipes(), [qw/ lemon_curd pancakes enchiladas /], ‘all of the recipes are there’);

SKIP: { skip ‘No ingredients’, 2, if @ingredients < 1; is( $number, 23, ‘and the number is 23’ );};

dies_ok( sub { eat_cake }, qr/Cake isn’t chocolate/, ‘only eat chocolate cake’);

What this talk will do

What this talk won’t do

WhyHaveAltercationsThatEncourageViolent ExcitableRants?

Make them easy to run

Run early, run often

Blackbox testing

Glassbox testing

Whatever.

#!/usr/bin/perl

use strict;use warnings;

get_jiggy();

sub get_jiggy { # details, details}

Testing scripts

__FILE__

Testing scripts

__FILE__

bin/get_jig

gy.pl

Testing scripts

$0

Testing scripts

$0

AKA $PROGRAM_NAME

Testing scripts

$0

AKA $PROGRAM_NAME

Testing scripts

bin/get_

jiggy.pl

$0

AKA $PROGRAM_NAME

Testing scripts

bin/get_

jiggy.pl

t/test_jigg

iness.t

__FILE__

Testing scripts

bin/get_jig

gy.pl

$0

t/test_jigg

iness.t

!=<>ne≠

__FILE__

Testing scripts

bin/get_jig

gy.pl

$0

bin/get_jig

gy.pl

eq==

#!/usr/bin/perl

use strict;use warnings;

get_jiggy() if $0 eq __FILE__;

sub get_jiggy { # details, details}

Testing scripts

#!/usr/bin/perl

use strict;use warnings;use Test::More tests => 42;

require_ok( ‘bin/get_jiggy.pl’ );

can_ok( ‘main’, ‘get_jiggy’, ‘jigginess achieved’ );

# test the details

Testing scripts

Code coverage

Code coverage

cover -test

Code coverage

cover -test

./Build testcover

Code coverage

cover -test

./Build testcover

HARNESS_PERL_SWITCHES=-MDevel::Cover make test

Demonstration time!

Version control

Testing and version control

?

Testing and version control

Version control

Reusing test code

Reusing test code

for(qw/ is_hilarious is_annoying is_bewildering /) { can_ok( Child, $_ ); is( Child->$_, 1, “...and the child $_” );}

Reusing test codesub _test_accessor { my ( $method ) = @_;

my $getter = "get_$method"; my $setter = "set_$method";

can_ok( 'Cat', $getter ); can_ok( 'Cat', $setter );

is( Cat->new->$getter, undef, "...and $method is undef to start with" ); ....}

_test_accessor( ‘sleep’ );

Reusing test codesub _test_accessor { my ( $method ) = @_;

my $getter = "get_$method"; my $setter = "set_$method";

can_ok( 'Cat', $getter ); can_ok( 'Cat', $setter );

is( Cat->new->$getter, undef, "...and $method is undef to start with" ); ....}

_test_accessor( $_ ) for(qw/ sleep eat purr /);

Whatever.

Custom test libraries

$ prove tt/00_basics....ok All tests successful.Files=1, Tests=377, 1 wallclock secs ( 0.17 cusr + 0.02 csys = 0.19 CPU)


package Test::Clowns;use Test::Builder;use Perl6::Junction qw/ any /;

my $Test = Test::Builder->new;

sub test_clowns { my($clown, $name) = @_; $clown->hop_out_of_a_very_small_car();

$Test->ok( $clown->can_juggle, $name ); $Test->ok( $clown->has_pies, $name ); if( any($clown->faces) eq ‘scary’ ) { $Test->fail( “clowns shouldn’t be scary” ); } $Test->ok( $clown->is_scary, $name );}


use TAP::Harness;my $harness = TAP::Harness->new( verbose => 1, lib => [ 'lib', 'blib/lib' ],);$harness->runtests(@tests);


+

Fixtures

our %clients = ( 1001 => { client_id => 1001, dob => '1926-05-25', fname => 'Miles', lname => 'Davis', sex => 'Male', race => 'Black', marital_status => 'Divorced', substance_abuse => 'Yes', alcohol_abuse => 'Yes', gambling_abuse => 'Unknown', religion => 'Muslim', },

1002 => { client_id => 1002, dob => '1922-04-21', fname => 'Charles', lname => 'Mingus', sex => 'Male', race => 'Other', marital_status => 'Married', substance_abuse => 'No', alcohol_abuse => 'Yes', gambling_abuse => 'Unknown', religion => 'Buddhist', }, # etc, # etc, # etc. );

for my $client_id (keys %clients) { Test::Client->new( id => $clients{ $client_id } )->save;}

for my $client_id (keys %clients) { Test::Client->new( id => $clients{ $client_id } )->save;}

Test::Client->new(1001)->save;

sub create_test_client {

Test::Client->new( %args )->save;}

create_test_client( id => 2, dob => undef,);




$args{ dob } ||= ‘1970-01-01’;




$args{ dob } ||= ‘1970-01-01’;$args{ shrink } ||= create_test_shrink;

Mocking

MockingTest::MockObject


Test::MockClass


Test::MockClass

Sub::Override

MockingTest::MockDBI

Test::Mock::LWP

Test::Mock::HTTP::RequestTest::Mock::HTTP::Response

Selenium

How to win friends and convince others to test

Speeding up tests

Where to start?

Review

ReviewMake your tests easy to run


Run them often


Run them often

Test your modules


Run them often

Test your modules

Test your scripts


Run them often

Test your modules

Test your scripts

Improve your code coverage with Devel::Cover


Run them often

Test your modules

Test your scripts


Use version control, and check in often


Run them often

Test your modules

Test your scripts


Use version control, and check in often

Reuse your test code

Review

ReviewMake a test library


Use fixtures


Use fixtures

Mock when necessary


Use fixtures

Mock when necessary

Test quietly if you don’t have support


Use fixtures

Mock when necessary

Test quietly if you don’t have support

Start with the most-changed part of the code

Questions?

Thanks!

• Michael Schwern• Kirrily Robert• OSDC• realestate.com.au• you

Josh [email protected]

mailto:[email protected]

mailto:[email protected]

intermediate perl testing (or, let's not make a mess of things, shall we?)

Technology

mocking test

request test

test codeforqw

test code sub

testing scripts

code coveragecover test

buildernewsub test

version control