UndoableCommand result = dropCommandFactory.createCommand(dragAvatar);
assertNotNull(result);
assertEquals(true, result instanceof MergeResourceSetsCommand);
MergeResourceSetsCommand result2 = (MergeResourceSetsCommand) result;
assertEquals(sourceSet, result2.getAddedSet());
assertEquals(targetSet, result2.getModifiedSet());
assertEquals(resourceModel, result2.getResourceModel());
}