The two test classes still failing are ones I wrote. They're failing because UIImpersonator doesn't work correctly, which is a big hint that in Jenkins we're using a version of FlexUnit that was compiled for pure AS development, instead of for Flex development. In March Chris offered to release FlexUnit 4.3, and I thought it's best we do that first and then swap the swc for the flex one (in my local FlexUnit4\target folder it's called flexunit-4.3.0-20140410-flex_4.12.0.swc) to be used in the unit testing target in Jenkins.
But since now we want to release Flex 4.15, maybe we should just replace the current version with someone's local build of the 4.2 flexunit version (the latest). Does someone know where the swap should happen? Is it in flex-flexunit\FlexUnit4AntTasks\test\sandbox\libs\flexunit-core-flex-4.1.0.x-sdky.y.y.y.swc?