@Test
    void testDefault() {
        ID_TYPE def = createDefaultInstance();
        ID_TYPE def2 = createInstance("default");
        ID_TYPE notdef = createInstance("default2");
        assertTrue(isDefault(def));
        assertTrue(isDefault(def2));
        assertFalse(isDefault(notdef));
        assertEquals(def, def2);
        assertNotEquals(def2, notdef);
    }
Generic test for identifiers such as {@link Environment} and {@link RegionName}.
@author Ulf Lilleengen
config-provisioning/src/test/java/com/yahoo/config/provision/IdentifierTestBase.java