### Question:
DateTimeValueConverter { public String toDMNString(final DateTimeValue value) { if (!value.hasDate()) { return ""; } String dmnString = getDate(value); if (value.hasTime()) { dmnString += "T" + getTime(value); } return appendPrefixAndSuffix(dmnString); } @Inject  DateTimeValueConverter(final DateValueFormatter dateValueFormatter,
                                  final TimeValueFormatter timeValueFormatter); String toDMNString(final DateTimeValue value); DateTimeValue fromDMNString(final String dmnString); String toDisplay(final String rawValue);  }### Answer:
@Test public void testToDMNStringValuesNotSet() { final DateTimeValue value = new DateTimeValue(); final String actual = converter.toDMNString(value); assertEquals("", actual); }