### Question:
JodaDateTimeConverter implements Converter<Timestamp, DateTime> { @Override public DateTime from(Timestamp timestamp) { return timestamp != null ? new DateTime(timestamp.getTime()) : null; }  @Override DateTime from(Timestamp timestamp); @Override Timestamp to(DateTime dateTime); @Override Class<Timestamp> fromType(); @Override Class<DateTime> toType();  }### Answer:
@Test public void nullTimestampReturnsNullDateTime() { assertThat(converter.from(null)).isNull(); }