public EnumNode() {
    }
@Test
    void testEnumNode() {
        MyNode n = new MyNode();
        assertNull(n.getValue());
        assertEquals("(null)", n.toString());
        assertTrue(n.doSetValue("ONE"));
        assertEquals("ONE", n.getValue());
        assertEquals("ONE", n.toString());
        assertFalse(n.doSetValue("THREE"));
    }