### Question:
StaticHelpers { public static String[] getHexMap() { String[] mapOut = new String[16]; for (int i = 0; i < 16; i++) { mapOut[i] = int2hex[i]; } return mapOut; }  static String[] getHexMap(); static BigInteger string2BigInt(String in); static BigInteger bytes2BigInt(byte[] in); static String bytes2hex(byte[] in); static byte[] string2bytes(String in); static Set<U> andSet(Set<U> a, Set<U> b); static Set<U> orSet(Set<U> a, Set<U> b); static Set<U> subtractSet(Set<U> a, Set<U> b); static Set<U> xorSet(Set<U> a, Set<U> b); static Object getFirst(Set<U> a); static Date calendarToDate(Calendar cal); static Calendar dateToCalendar(Date date); static Calendar utcCalendarFromTuple(int... tup); static Date dateFromTuple(int... tup); static String getCalendarString(Calendar cal); static String getDateString(Date date); static Date currDate(); static List<Throwable> getExceptionCausesList(Throwable th); static int ubyte2int(byte in); static byte int2ubyte(int in); static boolean isByteWhiteSpace(byte byteIn); static List<Object> filterObjectList(List<Object> objsIn, Set<Class> clazz); static Date daysDelta(Date date, int days); static Date daysDelta(Date date, double days); static Date now(); static final long DAY_IN_MILLIS_LONG; }### Answer:
@Test public void testHexMap() { String hex = "0123456789abcdef"; String[] int2hex = StaticHelpers.getHexMap(); StringBuilder sb = new StringBuilder(32); for (int i = 0; i < 16; i++) { sb.append(int2hex[i]); } assertEquals(hex, sb.toString()); }