AirRunner The base class for Air application runners that use the Flex framework.
 FlexRunner The FlexTestRunner should be the base class for your test harness if you're testing a project that uses Flex components.
 ResultPrinter This is the base class for collecting test output and formatting for different displays.
 TestRunner The base class for ActionScript 3.0 test harness.
 XMLResultPrinter The XMLResultPrinter is used to transform AsUnit test results to JUnit-compatible XML content.