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Ovid (2709)

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Stuff with the Perl Foundation. A couple of patches in the Perl core. A few CPAN modules. That about sums it up.

Journal of Ovid (2709)

Monday March 31, 2008
05:42 AM

No Test::RelaxNG?

[ #36010 ]

I can't believe there's no Test::RelaxNG or similar on the CPAN. On the other hand, I can't believe there's no Test::YAML out there, either. Oh, wait, there is is Test::YAML, but it not only doesn't do anything particularly useful (that I can tell), it also relies on Spiffy. Jonathan Rockway has Test::YAML::Valid, but it only tests that YAML is valid (well, duh :). It doesn't let me test whether or not the YAML contents are correct. Of course, this is why I wrote Test::JSON, a module which I was astonished hadn't already existed.

Someone (hint, hint!), really needs to take XML, JSON, and YAML and create one giant Test::SomeCleverName module which lets people bundle all of those needs together.

For the curious, here's a rather naive implementation of Test::RelaxNG that I just wrote:

package Bermuda::Data::Test;

use strict;
use warnings;

use Test::Builder;
use XML::LibXML;
use base 'Exporter';
our @EXPORT = 'is_valid_against_rng';

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

sub is_valid_against_rng ($$;$) {
    my ( $xml, $schema, $name ) = @_;
    $name ||= 'XML validates against RNG';

    my $parser = XML::LibXML->new;
    my $rng    = XML::LibXML::RelaxNG->new( string => $schema );

    eval {

    if ( my $error = $@ ) {
        $TEST->ok( 0, $name );
    else {
        $TEST->ok( 1, $name );
        return 1;


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  • This plants seeds of interesting ideas into my brain. I see that Test::XML exists but seems to be abandoned. Now I must go take some notes before I forget these things...



    • I was about to say that it's not abandoned as the author recently accepted a patch from me, but then I noticed that the patch was sent in 2005.

      • Yeah, I've had some moments like that... (like realizing how long it's been since my book came out)



  • Test::RelaxNG and Test::YAML (the hypothetical one) are in different categories IMHO. RelaxNG is XML specific validation YAML, otoh, is just a format Validating the data (not the serialization of the data) seems to be what you care about, so why not just use Test::Deep? It's complete, robust, well tested, featureful... I don't see why a data validation test suite has to be redone for every serliazation format out there. In fact, I'd much rather see RelaxNG validation become applicable to non XML format
  • I am actively working on this now. Keep an eye to CPAN for something in the next 2-4 days. Still trying to think of a good base namespace that applies equally to XML, JSON and YAML.

    I'm tempted to call it Test::Markup with the full knowledge that the use of the word "Markup" will wind up the YAML guys.



  • Woot! Ask and thou shalt receive. Thanks :)