2012-11-25 16:01:26.789 RegressionTests[43693:11f03] *** Assertion failure in +[AVAnimatorViewTests testAttachTwoDifferentMedia], /Users/mo/Development/QTAnimationiPhone/QTFileParserApp/Classes/Tests/AVAnimatorViewTests.m:1533
frame #3: 0x0002da9a RegressionTests`+[AVAnimatorViewTests testAttachTwoDifferentMedia] + 4986 at AVAnimatorViewTests.m:1533
The issue is that the two returned objects are the same UIImage object:
(lldb) po beforeImage
(UIImage *) $1 = 0x07c34470 <UIImage: 0x7c34470>
(lldb) po afterImage
(UIImage *) $2 = 0x07c34470 <UIImage: 0x7c34470>