### Question:
LongTimestamp implements Comparable<LongTimestamp> { @Override public String toString() { return formatTimestamp(TimestampType.MAX_PRECISION, epochMicros, picosOfMicro); } LongTimestamp(long epochMicros, int picosOfMicro); long getEpochMicros(); int getPicosOfMicro(); @Override boolean equals(Object o); @Override int hashCode(); @Override int compareTo(LongTimestamp other); @Override String toString();  }### Answer:
@Test public void testToString() { assertEquals(new LongTimestamp(1600960182536000L, 0).toString(), "2020-09-24 15:09:42.536000000000"); assertEquals(new LongTimestamp(1600960182536123L, 0).toString(), "2020-09-24 15:09:42.536123000000"); assertEquals(new LongTimestamp(1600960182536123L, 456000).toString(), "2020-09-24 15:09:42.536123456000"); assertEquals(new LongTimestamp(1600960182536123L, 456789).toString(), "2020-09-24 15:09:42.536123456789"); }