Autogenerated Test Stubs

| 1 Comment

Sometimes getting test coverage where it ought to be can be a little tedious, at least with a highly dynamic language. I have an object containing constant data and synthetic attributes calculated from the constant data. It has about a dozen of these synthetic attributes:

has [ @plusses, @minuses ], is => 'ro', lazy_build => 1;

I use this skeleton for my testing code:

#! perl

use Modern::Perl;
use Test::More;
use lib 't/lib';

__PACKAGE__->main( 'Some::Module::To::Test' );

sub main
    my ($test, $module) = @_;
    use_ok( $module ) or exit;

    $test->test_some_feature( $module );
    $test->test_another_feature( $module );
    $test->test_still_another_feature( $module );
    $test->test_one_remaining_feature( $module );


sub default_args
    my $self = shift;

        default => 'Value',
        for     => 'example',

sub test_some_feature
    my ($test, $module) = @_;
    my $obj             = $module->new( $test->default_args );


Ultimately I should port these tests to Test::Class, but I don't quite need it yet. That does leave some repetition in typing the boilerplate code I need for each test method. If I were using an IDE which could resolve these method calls without having to run code, I'd let autocomplete generate this code for me.

It's only a couple of extra steps in Perl though:

    (my $name = our $AUTOLOAD) =~ s/main:://;
    print STDERR <<END_HERE;
sub $name
    my (\$test, \$module) = \@_;
    my \$score           = \$module->new( \$test->default_args );


With that AUTOLOAD in place, I can run the test, redirect STDERR to a file, then insert the contents of that file in the test file itself. It's silly and it's simple, but it works.

1 Comment

You should look into Test::Routine as an alternative to Test::Class, it's quite nice.

Modern Perl: The Book

cover image for Modern Perl: the book

The best Perl Programmers read Modern Perl: The Book.

sponsored by the How to Make a Smoothie guide



About this Entry

This page contains a single entry by chromatic published on June 1, 2011 5:30 PM.

Deprecation Versus Novices: No One Wins was the previous entry in this blog.

Test Coverage and Simplicity is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.

Powered by the Perl programming language

what is programming?