Automated testing makes your life as a developer easier because you get quick feedback if you change some code and accidentally break something that was working previously. I know I'm more confident in the stability of my code when I see that the 1000+ tests in one of my libraries are still passing after I make some big changes.
That's why I created nextgenas-test. I wanted something a bit more like FlexUnit, where tests are defined as methods on classes, with [Test], [Before], and [After] metadata that can be detected with reflection APIs.
You can see the example of a simple test in the image at the top of this post.
Both asconfigc and nextgenas-test have tests written with nextgenas-test (yes, it tests itself!), and I plan to continue testing future projects with this library. I hope you'll give it a try and share some feedback. Thanks!