Add unit test for DSJ ServiceAlteration

Author: vpaturet

src/test/java/org/rutebanken/netex/model/UnmarshalTimetableFrameTest.java

@@ -95,6 +95,7 @@ void unmarshalTimetableFrame() throws JAXBException {
                 "            </ServiceJourney>\n" +
                 "           \n" +
                 "            <DatedServiceJourney version=\"1\" id=\"VYG:DatedServiceJourney:96_KMB-NK_23-12-09\">\n" +
+                "              <ServiceAlteration>cancellation</ServiceAlteration>" +
                 "              <ServiceJourneyRef ref=\"VYG:ServiceJourney:96-KMB_87815-R\" version=\"11\"></ServiceJourneyRef>\n" +
                 "              <DatedServiceJourneyRef ref=\"VYG:DatedServiceJourney:8916_KVG-DEG_23-10-19\" version=\"1\"></DatedServiceJourneyRef>\n" +
                 "              <OperatingDayRef ref=\"VYG:OperatingDay:2023-12-09\"></OperatingDayRef>\n" +
@@ -128,6 +129,7 @@ void unmarshalTimetableFrame() throws JAXBException {
         assertEquals("VYG:OperatingDay:2023-12-09", dsj.getOperatingDayRef().getRef());
         assertEquals("VYG:ServiceJourney:96-KMB_87815-R", dsj.getJourneyRef().get(0).getValue().getRef());
         assertEquals("VYG:DatedServiceJourney:8916_KVG-DEG_23-10-19", dsj.getJourneyRef().get(1).getValue().getRef());
+        assertEquals("cancellation", dsj.getServiceAlteration().value());