test for overflowing the MapStore operation queue.

Are we thrown an exception ?
will an item be put into a map In the event of the backing MapStore encountering an overflow in its operation queue.
This test is is marked Problematic  as it fails on the    assertEquals(max, map.size());

the Questions is, what is the desired behaviour of the map, when the backing map store encounters the an overflow.
should the item be in the map or not.