Mock-Quick is here to solve the current problems with Mocking libraries.

There are a couple Mocking libraries available on CPAN. The primary
problems with these libraries include verbose syntax, and most importantly
side-effects. Some Mocking libraries expect you to mock a specific class,
and will unload it then redefine it. This is particularly a problem if you
only want to override a class on a lexical level.

Mock-Object provides a declarative mocking interface that results in a very
concise, but clear syntax. There are separate facilities for mocking object
instances, and classes. You can quickly create an instance of an object
with custom attributes and methods. You can also quickly create an
anonymous class, optionally inheriting from another, with whatever methods
you desire.