public static ByteSize parseBytesSizeValue(String value) {
        final Long longValue = toLong(value);
        if (longValue == null) {
            return null;
        }
        return () -> longValue;
    }
@Test
    void returnsNullForUnparseableValue() {
        assertThat(SIUnitParser.parseBytesSizeValue("This is not a value")).isNull();
    }