Flexunit

hamcrest-as3

Port of hamcrest to ActionScript 3, a library of matcher objects (also known as constraints or predicates) allowing 'match' rules to be defined declaratively, to be used in other frameworks. Typical scenarios include testing frameworks, mocking libraries and UI validation rules.

RobotEyes

UI end-to-end testing gubbins to use within test cases

ASunit

The only ActionScript unit test framework that supports Flash Players 6, 7, 8, 9 and 10

AS3spec

A tiny BDD framework for AS3, inspired by Bacon and RSpec