### Question:
LoaderUtils { public static BuySell parseBuySell(String str) { switch (str.toUpperCase(Locale.ENGLISH)) { case "BUY": case "B": return BuySell.BUY; case "SELL": case "S": return BuySell.SELL; default: throw new IllegalArgumentException( "Unknown BuySell value, must be 'Buy' or 'Sell' but was '" + str + "'; " + "parser is case insensitive and also accepts 'B' and 'S'"); } } 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_parseBuySell() { assertThat(LoaderUtils.parseBuySell("BUY")).isEqualTo(BuySell.BUY); assertThat(LoaderUtils.parseBuySell("Buy")).isEqualTo(BuySell.BUY); assertThat(LoaderUtils.parseBuySell("buy")).isEqualTo(BuySell.BUY); assertThat(LoaderUtils.parseBuySell("b")).isEqualTo(BuySell.BUY); assertThat(LoaderUtils.parseBuySell("SELL")).isEqualTo(BuySell.SELL); assertThat(LoaderUtils.parseBuySell("Sell")).isEqualTo(BuySell.SELL); assertThat(LoaderUtils.parseBuySell("sell")).isEqualTo(BuySell.SELL); assertThat(LoaderUtils.parseBuySell("s")).isEqualTo(BuySell.SELL); assertThatIllegalArgumentException().isThrownBy(() -> LoaderUtils.parseBuySell("Rubbish")); }