public static Range<Integer> integerRange(String range) {
        return ofString(range, Integer::parseInt, Integer.class);
    }
@Test
    public void testUnboundedRangeStringIsRejected() {
        PostgreSQLGuavaRangeType instance = PostgreSQLGuavaRangeType.INSTANCE;
        assertEquals(Range.all(), instance.integerRange("(,)"));
    }