Development: Fix cases of ignored return values

src/main/java/de/tum/in/www1/artemis/service/plagiarism/PlagiarismAnswerPostService.java

@@ -106,13 +106,13 @@ public AnswerPost updateAnswerPost(Long courseId, Long answerPostId, AnswerPost
         }
         AnswerPost existingAnswerPost = this.findById(answerPostId);
         final Course course = courseRepository.findByIdElseThrow(courseId);
-        authorizationCheckService.isAtLeastStudentInCourse(course, user);
+        authorizationCheckService.checkHasAtLeastRoleInCourseElseThrow(Role.STUDENT, course, user);
         parseUserMentions(course, answerPost.getContent());
 
         AnswerPost updatedAnswerPost;
 
         // determine if the update operation is to mark the answer post as resolving the original post
-        if (existingAnswerPost.doesResolvePost() != answerPost.doesResolvePost()) {
+        if (!Objects.equals(existingAnswerPost.doesResolvePost(), answerPost.doesResolvePost())) {
             // check if requesting user is allowed to mark this answer post as resolving, i.e. if user is author or original post or at least tutor
             mayMarkAnswerPostAsResolvingElseThrow(existingAnswerPost, user, course);
             existingAnswerPost.setResolvesPost(answerPost.doesResolvePost());

src/main/java/de/tum/in/www1/artemis/service/tutorialgroups/TutorialGroupService.java

@@ -503,7 +503,6 @@ private Set<User> findUsersByRegistrationNumbers(Set<String> registrationNumbers
 
     private Set<User> findUsersByLogins(Set<String> logins, String groupName) {
         return new HashSet<>(userRepository.findAllWithGroupsByIsDeletedIsFalseAndGroupsContainsAndLoginIn(groupName, logins));
-
     }
 
     /**

src/main/java/de/tum/in/www1/artemis/web/rest/metis/conversation/ChannelResource.java

@@ -281,9 +281,9 @@ public ResponseEntity<Void> deleteChannel(@PathVariable Long courseId, @PathVari
         var requestingUser = userRepository.getUserWithGroupsAndAuthorities();
         channelAuthorizationService.isAllowedToDeleteChannel(channel, requestingUser);
 
-        tutorialGroupChannelManagementService.getTutorialGroupBelongingToChannel(channel).ifPresentOrElse(tutorialGroup -> {
+        tutorialGroupChannelManagementService.getTutorialGroupBelongingToChannel(channel).ifPresent(tutorialGroup -> {
             throw new BadRequestAlertException("The channel belongs to tutorial group " + tutorialGroup.getTitle(), CHANNEL_ENTITY_NAME, "channel.tutorialGroup.mismatch");
-        }, Optional::empty);
+        });
 
         var usersToNotify = conversationParticipantRepository.findConversationParticipantsByConversationId(channel.getId()).stream().map(ConversationParticipant::getUser)
                 .collect(Collectors.toSet());

src/test/java/de/tum/in/www1/artemis/metis/ConversationIntegrationTest.java

@@ -211,7 +211,10 @@ void getConversationsOfUser_onlyCourseWideChannelsIfMessagingDisabled() throws E
         setCourseInformationSharingConfiguration(CourseInformationSharingConfiguration.COMMUNICATION_ONLY);
         List<ConversationDTO> channels = request.getList("/api/courses/" + exampleCourseId + "/conversations", HttpStatus.OK, ConversationDTO.class);
 
-        channels.forEach(conv -> assertThat(conv instanceof ChannelDTO ch && ch.getIsCourseWide()));
+        assertThat(channels).allSatisfy(ch -> {
+            assertThat(ch).isInstanceOf(ChannelDTO.class);
+            assertThat(((ChannelDTO) ch).getIsCourseWide()).isTrue();
+        });
 
         // cleanup
         conversationMessageRepository.deleteById(post.getId());

src/test/java/de/tum/in/www1/artemis/tutorialgroups/TutorialGroupSessionIntegrationTest.java

@@ -180,7 +180,7 @@ void updateAttendanceCount_asTutor_shouldUpdateAttendanceCount() throws Exceptio
 
         // when
         request.patchWithResponseBody(getSessionsPathOfTutorialGroup(exampleTutorialGroupId, session.getId()) + "/attendance-count", null, TutorialGroupSession.class,
-                HttpStatus.OK).getId();
+                HttpStatus.OK);
         updatedSession = tutorialGroupSessionRepository.findByIdElseThrow(updatedSessionId);
         assertThat(updatedSession.getAttendanceCount()).isNull();