Add support for HTML::Lint::Pluggable

[swelljoe]

Test::HTML::Lint currently only supports a $lint object reference of type HTML::Lint, which prevents use of HTML::Lint::Pluggable modules in tests. I needed HTML5 support, so I did some digging, and found why it didn't work. This change allows tests using the HTML4 validator to continue to work, as before, but now makes it possible to add new validators via the pluggable interface.

Using it looks exactly the same, except for setting up the $lint object:

    use HTML::Lint::Pluggable;
    my $lint = new HTML::Lint::Pluggable;
    $lint->load_plugins(qw/HTML5/);

    html_ok( $lint, $content, "HTML validation");

[petdance]

I've never seen HTML::Lint::Pluggable before. I'll have to take a look at it.

[petdance]

Is this still something you'd like to see supported?

[swelljoe]

Sure. As far as I recall, it just needs this patch merged to make it work. I believe it was backward compatible (tests worked). It's been a while since I poked at it. So, I think it is easy (merge the patch), and I think it is safe (it won't break existing use cases). I used the patched version for a while without incident, and will probably come back to it eventually.