[Pharo-project] Test for Collection>>sorted

I wrote two tests on the ArrayTest collection to test #sorted and #sorted: #sorted broke, it is easy to fix. I guess we need to write these tests for the whole CollectionTest hierarchy. I noted there is a CollectionRootTest using trait, however when looking at the asSortedCollection tests, it is reapeatly written for almost each classes of the hierarchy, and not in the CollectionRootTest using inheritance mechanism. Any reason for that? Hilaire