### Question:
DateTimeValueConverter { String appendPrefixAndSuffix(final String value) { return PREFIX + value + SUFFIX; } @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 testAppendPrefixAndSuffix() { final String value = "value"; final String expected = DateTimeValueConverter.PREFIX + value + DateTimeValueConverter.SUFFIX; final String actual = converter.appendPrefixAndSuffix(value); assertEquals(expected, actual); }