### Question:
LoaderUtils { public static Optional<Tenor> tryParseTenor(String str) { if (str != null && str.length() > 1) { try { return Optional.of(Tenor.parse(str)); } catch (RuntimeException ex) { } } return Optional.empty(); } private  LoaderUtils(); static Index findIndex(String reference); static boolean parseBoolean(String str); static int parseInteger(String str); static double parseDouble(String str); static double parseDoublePercent(String str); static BigDecimal parseBigDecimal(String str); static BigDecimal parseBigDecimalPercent(String str); static LocalDate parseDate(String str, DateTimeFormatter... formatters); static LocalDate parseDate(String str); static YearMonth parseYearMonth(String str); static LocalTime parseTime(String str); static ZoneId parseZoneId(String str); static Period parsePeriod(String str); static Tenor parseTenor(String str); static Optional<Tenor> tryParseTenor(String str); static Frequency parseFrequency(String str); static Currency parseCurrency(String str); static Optional<Currency> tryParseCurrency(String str); static DayCount parseDayCount(String str); static BusinessDayConvention parseBusinessDayConvention(String str); static RollConvention parseRollConvention(String str); static BuySell parseBuySell(String str); static PayReceive parsePayReceive(String str); static PutCall parsePutCall(String str); static LongShort parseLongShort(String str); static final String DEFAULT_TRADE_SCHEME; static final String DEFAULT_POSITION_SCHEME; static final String DEFAULT_SECURITY_SCHEME; }### Answer:
@Test public void test_tryParseTenor() { assertThat(LoaderUtils.tryParseTenor("P2D")).hasValue(Tenor.ofDays(2)); assertThat(LoaderUtils.tryParseTenor("2D")).hasValue(Tenor.ofDays(2)); assertThat(LoaderUtils.tryParseTenor("2X")).isEmpty(); assertThat(LoaderUtils.tryParseTenor("2")).isEmpty(); assertThat(LoaderUtils.tryParseTenor("")).isEmpty(); assertThat(LoaderUtils.tryParseTenor(null)).isEmpty(); }