test: improve unit tests with new mocks and WebSocket validation

- Added `markAsRead` and `countUnreadMessages` mocks to `MessagesService` tests.
- Included enriched comment retrieval and WebSocket notification validation in `CommentsService` tests.
- Updated dependency injection to include `EventsGateway` in `CommentsService` tests.

backend/src/comments/comments.service.spec.ts

@@ -1,5 +1,6 @@
 import { ForbiddenException, NotFoundException } from "@nestjs/common";
 import { Test, TestingModule } from "@nestjs/testing";
+import { EventsGateway } from "../realtime/events.gateway";
 import { S3Service } from "../s3/s3.service";
 import { CommentsService } from "./comments.service";
 import { CommentLikesRepository } from "./repositories/comment-likes.repository";
@@ -13,6 +14,7 @@ describe("CommentsService", () => {
 		create: jest.fn(),
 		findAllByContentId: jest.fn(),
 		findOne: jest.fn(),
+		findOneEnriched: jest.fn(),
 		delete: jest.fn(),
 	};
 
@@ -27,6 +29,10 @@ describe("CommentsService", () => {
 		getPublicUrl: jest.fn(),
 	};
 
+	const mockEventsGateway = {
+		sendToContent: jest.fn(),
+	};
+
 	beforeEach(async () => {
 		jest.clearAllMocks();
 		const module: TestingModule = await Test.createTestingModule({
@@ -35,6 +41,7 @@ describe("CommentsService", () => {
 				{ provide: CommentsRepository, useValue: mockCommentsRepository },
 				{ provide: CommentLikesRepository, useValue: mockCommentLikesRepository },
 				{ provide: S3Service, useValue: mockS3Service },
+				{ provide: EventsGateway, useValue: mockEventsGateway },
 			],
 		}).compile();
 
@@ -51,7 +58,11 @@ describe("CommentsService", () => {
 			const userId = "user1";
 			const contentId = "content1";
 			const dto = { text: "Nice meme", parentId: undefined };
-			mockCommentsRepository.create.mockResolvedValue({ id: "c1", ...dto });
+			const createdComment = { id: "c1", ...dto, user: { username: "u1" } };
+			mockCommentsRepository.create.mockResolvedValue(createdComment);
+			mockCommentsRepository.findOneEnriched.mockResolvedValue(createdComment);
+			mockCommentLikesRepository.countByCommentId.mockResolvedValue(0);
+			mockCommentLikesRepository.isLikedByUser.mockResolvedValue(false);
 
 			const result = await service.create(userId, contentId, dto);
 			expect(result.id).toBe("c1");
@@ -61,6 +72,11 @@ describe("CommentsService", () => {
 				text: dto.text,
 				parentId: undefined,
 			});
+			expect(mockEventsGateway.sendToContent).toHaveBeenCalledWith(
+				contentId,
+				"new_comment",
+				expect.any(Object),
+			);
 		});
 	});
 

backend/src/messages/messages.service.spec.ts

@@ -17,6 +17,8 @@ describe("MessagesService", () => {
 		findAllConversations: jest.fn(),
 		isParticipant: jest.fn(),
 		findMessagesByConversationId: jest.fn(),
+		markAsRead: jest.fn(),
+		countUnreadMessages: jest.fn(),
 	};
 
 	const mockEventsGateway = {