public void test_toInstant_19700101_oneNano() {

    OffsetDateTime dt = OffsetDateTime.of(1970, 1, 1, 0, 0, 0, 1, ZoneOffset.UTC);
    Instant test = dt.toInstant();
    assertEquals(test.getEpochSecond(), 0);
    assertEquals(test.getNano(), 1);
  }