void () { assertEquals(1, myManager.getGridColumnCount(myContainer)); insertComponent(0, 0, 1, 1); GridInsertLocation location = new GridInsertLocation(myContainer, 0, 0, GridInsertMode.ColumnAfter); DraggedComponentList dcl = DraggedComponentList.withComponents(myDropComponent); assertTrue(location.canDrop(dcl)); doDrop(location); assertEquals(2, myManager.getGridColumnCount(myContainer)); }