Organic Programming

Flash Builder 4 comes in 2 flavors: Standard Edition and Premium. With Standard Edition you can’t run unit tests inside Eclipse. If you’re reading this post then I guess you’re looking for an easy and free way of unit testing your flex application. There is a easy way of doing this. All you have to do is create a project, add some swc libraries and set up unit testing.

For a Flex 4.1 environment, you’ll need to add flexunit-core-flex-4.1.0 and flexunit-uilistener-4.1.0 libraries to your project, write test classes and suite class to include the tests, and in the end you should write a little code to Default Application file.

Here is a sample unit testing project you can look over.

The whole post was meant to be short and provide a simple, but reliable way of unit testing in Flex.
For more details and more advanced features you can check out the official website.