@Test
void getRef() throws SQLException {

    assertEquals(RS_REF.getValue(), ResultSetUtil.getRef(RESULT_SET, RS_REF.getLabel()));
    assertEquals(RS_REF.getValue(), ResultSetUtil.getRef(RESULT_SET, RS_REF.getIndex()));
    assertNull(ResultSetUtil.getRef(NULL_RESULT_SET, RS_REF.getLabel()));
    assertNull(ResultSetUtil.getRef(NULL_RESULT_SET, RS_REF.getIndex()));
}