@Override
    public RangePartition clone() throws CloneNotSupportedException {
        return (RangePartition)super.clone();
    }
@Test
    void requireThatCloneIsImplemented() throws CloneNotSupportedException {
        RangePartition node1 = new RangePartition("foo=300-399");
        RangePartition node2 = node1.clone();
        assertEquals(node1, node2);
        assertNotSame(node1, node2);
    }