There are three main types of testing of any application: Unit testing, where you test small pieces of functionality; Functional and user-acceptance testing where developers, QA engineers and the end user can ensure that the application does what it’s expected to do; and Load (or stress) testing, when you ensure that the server can process requests of the specified number of users. Rich Internet applications have are no different when it comes to testing. While the load testing software is not cheap, there affordable solutions for Flex applications that you need to know about. Flash Builder 4 nicely integrates FLexUnit4 and I highly encourage you not to ignore the unit testing. Just use it.

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