I'm trying out Beta 2 as an upgrade from 4.0 and I'm finding that I'm having to use a different namespace than previously specified and what's specified in the Wiki.
Old: http://www.adobe.com/2009/flexUnitUIRunner
New: org.flexunit.flexui.*
This is the only change I was required to make when switching versions. Without this change I get:
Could not resolve <flexUnitUIRunner:TestRunnerBase> to a component implementation. MyTests.mxml /MyTests/src line 42 Flex Problem
I've found several other threads where folks have had a similar problem with a similar solution. It seems as if the namespace information isn't included in the .swc file because the only way I can find it is through the package namespace.