@Test
public void testGetCellSafe() throws Exception {

    CellGrid<MyCell> grid = createGrid(GridDef.createGlobal(5.0));
    assertNull(grid.getCell(0, 9));
    MyCell cell = grid.getCellSafe(0, 9);
    assertNotNull(cell);
    assertSame(cell, grid.getCell(0, 9));
    assertSame(cell, grid.getCellSafe(0, 9));
}