MT::Test is a framework for testing Movable Type plugins. It is a subclass of Test::Builder::Module from Test::More that adds additional MT specific tests and functionality.
Those familiar with Test::More will be right at home. The one major addition is the ability to test template tag output using one method and half a dozen testing specific template tags.
The framework includes a command tool for running the tests with specific configuration or even with a fresh default database. See the manpage for mtt.