decrease visibility of applyEvent methods + new testbuilder

src/main/java/mops/gruppen2/domain/event/AddUserEvent.java

@@ -32,14 +32,14 @@ public class AddUserEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws EventException {
+    protected void applyEvent(Group group) throws EventException {
         User user = new User(this.userId, this.givenname, this.familyname, this.email);
 
         if (group.getMembers().contains(user)) {
             throw new UserAlreadyExistsException(this.getClass().toString());
         }
 
-        if (group.getMembers().size() == group.getUserMaximum()){
+        if (group.getMembers().size() == group.getUserMaximum()) {
             throw new GroupFullException(this.getClass().toString());
         }
 

src/main/java/mops/gruppen2/domain/event/CreateGroupEvent.java

@@ -28,7 +28,7 @@ public class CreateGroupEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         group.setId(this.groupId);
         group.setParent(this.groupParent);
         group.setType(this.groupType);

src/main/java/mops/gruppen2/domain/event/DeleteGroupEvent.java

@@ -15,7 +15,7 @@ public class DeleteGroupEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         group.getRoles().clear();
         group.getMembers().clear();
         group.setTitle(null);

src/main/java/mops/gruppen2/domain/event/DeleteUserEvent.java

@@ -21,7 +21,7 @@ public class DeleteUserEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws EventException {
+    protected void applyEvent(Group group) throws EventException {
         for (User user : group.getMembers()) {
             if (user.getId().equals(this.userId)) {
                 group.getMembers().remove(user);

src/main/java/mops/gruppen2/domain/event/UpdateGroupDescriptionEvent.java

@@ -24,7 +24,7 @@ public class UpdateGroupDescriptionEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         if (this.newGroupDescription.isEmpty()) {
             throw new NoValueException(this.getClass().toString());
         }

src/main/java/mops/gruppen2/domain/event/UpdateGroupTitleEvent.java

@@ -24,7 +24,7 @@ public class UpdateGroupTitleEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) {
+    protected void applyEvent(Group group) {
         if (this.getNewGroupTitle().isEmpty()) {
             throw new NoValueException(this.getClass().toString());
         }

src/main/java/mops/gruppen2/domain/event/UpdateRoleEvent.java

@@ -25,7 +25,7 @@ public class UpdateRoleEvent extends Event {
     }
 
     @Override
-    public void applyEvent(Group group) throws UserNotFoundException {
+    protected void applyEvent(Group group) throws UserNotFoundException {
         if (group.getRoles().containsKey(this.userId)) {
             group.getRoles().put(this.userId, this.newRole);
             return;