@punamdahiya The race condition is most likely related to the behavior of the application itself, not your test logic. It's tough to say without digging into the Video app specifics--I had to struggle a lot to iron out the race conditions for the Clock integration tests (and I still can't be 100% sure that I've fixed them all). My best advice is to start with the error, and try to work backwards. What is it about the element at selector `ul.thumbnail-group-container li` that might not be available when you expect it? For instance, is the content of its parent being re-set asynchronously with `Element#innerHTML`?