public UiLinkId uiLinkId() {
        return uiLinkId;
    }
@Test
    public void uiLinkId() {
        blink = new ConcreteLink(UiLinkId.uiLinkId(RA, RB));
        print(blink);
        assertEquals("non-canon AB", EXP_RA_RB, blink.linkId());

        assertNull("key not null", blink.key());
        assertNull("one not null", blink.one());
        assertNull("two not null", blink.two());
    }