Add a test for compositeView behaviors

~~Shows the error in #1389~~

~~This seems to be a problem with the event not getting set in the childView.~~

as @MasterLambaster said

>  i guess it's caused by fd74e60. CollectionView uses buffering and does not use regions, therefore onShow is not triggered for Behavior. It works just fine on 1.8.5

Well i just stripped down the tests and they are no longer failing... need to think about why