fix tests after refactor

src/main/java/mops/gruppen2/domain/Aggregate.java

@@ -8,9 +8,9 @@ import java.lang.reflect.Method;
 /**
  * Repräsentiert viele Events als aggregiertes Objekt.
  */
+@Getter
 public abstract class Aggregate {
 
-    @Getter
     protected long id;
 
     /**

src/main/java/mops/gruppen2/domain/Group.java

@@ -25,6 +25,7 @@ public class Group extends Aggregate {
     private void applyEvent(CreateGroupEvent event) {
         title = event.getGroupTitle();
         description = event.getGroupDescription();
+        id = event.getGroup_id();
     }
 
     private void applyEvent(UpdateRoleEvent event) {