### Question:
TimeEncoding { public static String toString(long instant) { TaiUtcConverter.DateTimeComponents dtc = taiUtcConverter.instantToUtc(instant); StringBuilder sb = new StringBuilder(); formatOn4Digits(dtc.year, sb); sb.append("-"); formatOn2Digits(dtc.month, sb); sb.append("-"); formatOn2Digits(dtc.day, sb); sb.append("T"); formatOn2Digits(dtc.hour, sb); sb.append(":"); formatOn2Digits(dtc.minute, sb); sb.append(":"); formatOn2Digits(dtc.second, sb); sb.append("."); formatOn3Digits(dtc.millisec, sb); return sb.append("Z").toString(); }  static void setUp(); static void setUp(InputStream in); @Deprecated static long currentInstant(); static long getWallclockTime(); static String toString(long instant); static String toOrdinalDateTime(long instant); static String toWinCompatibleDateTime(long instant); static String toCombinedFormat(long instant); static long fromGpsCcsdsTime(int coarseTime, byte fineTime); static GpsCcsdsTime toGpsTime(final long instant); static GpsCcsdsTime getCurrentGpsTime(); static long toGpsTimeMillisec(final long instant); static long fromGpsYearSecMillis(int year, int secOfYear, int millis); static TaiUtcConverter.DateTimeComponents toUtc(long instant); static List<ValidityLine> getTaiUtcConversionTable(); static long parse(String s); @Deprecated static long fromUnixTime(long milliseconds); static long fromUnixMillisec(long milliseconds); static long fromUnixTime(long seconds, int microseconds); static long toUnixMillisec(long instant); static long fromCalendar(Calendar cal); static long fromDate(Date date); static Calendar toCalendar(long instant); static long getJavaGpsFromInstant(long instant); static long getInstantfromJavaGps(long javagps); static long fromGpsMillisec(long gpstime); static long fromTaiMillisec(long taitime); static long toTaiMillisec(long instant); static long fromJ2000Millisec(long j2000time); static long toJ2000Millisec(long instant); static long fromProtobufTimestamp(Timestamp ts); static Timestamp toProtobufTimestamp(long instant); static final long INVALID_INSTANT; static final long MIN_INSTANT; static long MAX_INSTANT; }### Answer:
@Test public void testToStringLong() { assertEquals("1972-01-01T00:00:00.123Z", TimeEncoding.toString(j1972)); }
@Test public void testToString() { assertEquals("2008-12-31T23:59:59.000Z", TimeEncoding.toString(1230768032000L)); assertEquals("2008-12-31T23:59:60.000Z", TimeEncoding.toString(1230768033000L)); assertEquals("2009-01-01T00:00:00.000Z", TimeEncoding.toString(1230768034000L)); }