MoveHandler Test in iOS 5.1.1 safari failed

MoveHandler Test in iOS 5.1.1 safari failed

Now I'm testing jQuery Mobile by QUnit Test Suits. 

I tested by Android 4.0.3 native browser, iOS safari browser, Windows IE.
In one test, only iOS safari failed.
The "move handler returns when touchstart has been fired since touchstop" test failed only in iOS safari.

Please teach me why this test is failed.