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Test::Warn provides a few convenience methods for testing warning based code.

If you've ever tried to use Test::NoWarnings to confirm there are no warnings generated by your tests, combined with the convenience of done_testing to not have to declare a test count, you'll have discovered that these two features do not play well together, as the test count will be calculated before the warnings test is run, resulting in a TAP error. (See examples/test_nowarnings.pl in this distribution for a demonstration.) This module is intended to be used as a drop-in replacement for Test::NoWarnings: it also adds an extra test, but runs this test before done_testing calculates the test count, rather than after. It does this by hooking into done_testing as well as via an END block. You can declare a plan, or not, and things will still Just Work.

Tests for Valid XHTML (using XML::LibXML). If the XML is not valid, a message will be generated with specific details about where the parser failed.

This module provides tools for testing code which deals with XML. These tools are compatible with the Test::More and Test::Simple modules. At present, there is generic XML comparison support, as well as modules for dealing with XML::SAX, XML::Twig and XML::XPath handlers.

Test::YAML::Meta - Validation of the META.yml file in a distribution.

This module lets you easily test the validity of YAML.

Testing Module for YAML Implementations. Test::YAML is a subclass of Test::Base with YAML specific support.

The accessors pragma lets you create simple accessors at compile-time. This saves you from writing them by hand, which tends to result in cut-n-paste errors and a mess of duplicated code. It can also help you reduce the amount of unwanted direct-variable access that may creep into your code base when you're feeling lazy. accessors was designed with laziness in mind. Method-chaining accessors are generated by default. This may be changed in future versions! If you want backwards compatibility use accessors::chained and wait until the dust settles. See accessors::classic for accessors that always return the current value if you don't like method chaining.

aliased is simple in concept but is a rather handy module. It loads the class you specify and exports into your namespace a subroutine that returns the class name. You can explicitly alias the class to another name or, if you prefer, you can do so implicitly. In the latter case, the name of the subroutine is the last part of the class name.

Lets your class/object say it works like something else.