This is the list of flex testing frameworks Which I came Across

FlexUnit (Adobe Open Source)
FlexPMD (Adobe Technical Services)
Funit (Open Source)
asUnit (Open Source)
fluint (Open Source)
FlexMonkey (Open Source)
Selenium (Open Source)
FlashSelenium (Open Source)
HP QuickTest Professional 9.5
mock-as3 (Open Source)
FlexCover (Open Source)
FunFX
Mock4AS
ASMock
Mockito