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

import { ForbiddenException, NotFoundException } from "@nestjs/common";
import { Test, TestingModule } from "@nestjs/testing";
import { ContentsRepository } from "../contents/repositories/contents.repository";
import { EventsGateway } from "../realtime/events.gateway";
import { S3Service } from "../s3/s3.service";
import { CommentsService } from "./comments.service";
import { CommentLikesRepository } from "./repositories/comment-likes.repository";
import { CommentsRepository } from "./repositories/comments.repository";

describe("CommentsService", () => {
	let service: CommentsService;
	let repository: CommentsRepository;

	const mockCommentsRepository = {
		create: jest.fn(),
		findAllByContentId: jest.fn(),
		findOne: jest.fn(),
		findOneEnriched: jest.fn(),
		delete: jest.fn(),
	};

	const mockCommentLikesRepository = {
		addLike: jest.fn(),
		removeLike: jest.fn(),
		countByCommentId: jest.fn(),
		isLikedByUser: jest.fn(),
	};

	const mockContentsRepository = {
		findOne: jest.fn(),
	};

	const mockS3Service = {
		getPublicUrl: jest.fn(),
	};

	const mockEventsGateway = {
		sendToContent: jest.fn(),
		sendToUser: jest.fn(),
	};

	beforeEach(async () => {
		jest.clearAllMocks();
		const module: TestingModule = await Test.createTestingModule({
			providers: [
				CommentsService,
				{ provide: CommentsRepository, useValue: mockCommentsRepository },
				{ provide: CommentLikesRepository, useValue: mockCommentLikesRepository },
				{ provide: ContentsRepository, useValue: mockContentsRepository },
				{ provide: S3Service, useValue: mockS3Service },
				{ provide: EventsGateway, useValue: mockEventsGateway },
			],
		}).compile();

		service = module.get<CommentsService>(CommentsService);
		repository = module.get<CommentsRepository>(CommentsRepository);
	});

	it("should be defined", () => {
		expect(service).toBeDefined();
	});

	describe("create", () => {
		it("should create a comment", async () => {
			const userId = "user1";
			const contentId = "content1";
			const dto = { text: "Nice meme", parentId: undefined };
			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");
			expect(repository.create).toHaveBeenCalledWith({
				userId,
				contentId,
				text: dto.text,
				parentId: undefined,
			});
			expect(mockEventsGateway.sendToContent).toHaveBeenCalledWith(
				contentId,
				"new_comment",
				expect.any(Object),
			);
		});
	});

	describe("findAllByContentId", () => {
		it("should return comments for a content", async () => {
			mockCommentsRepository.findAllByContentId.mockResolvedValue([
				{ id: "c1", user: { avatarUrl: "path" } },
			]);
			mockCommentLikesRepository.countByCommentId.mockResolvedValue(5);
			mockCommentLikesRepository.isLikedByUser.mockResolvedValue(true);
			mockS3Service.getPublicUrl.mockReturnValue("url");

			const result = await service.findAllByContentId("content1", "u1");
			expect(result).toHaveLength(1);
			expect(result[0].likesCount).toBe(5);
			expect(result[0].isLiked).toBe(true);
			expect(result[0].user.avatarUrl).toBe("url");
		});
	});

	describe("remove", () => {
		it("should remove comment if owner", async () => {
			mockCommentsRepository.findOne.mockResolvedValue({ userId: "u1" });
			await service.remove("u1", "c1");
			expect(repository.delete).toHaveBeenCalledWith("c1");
		});

		it("should remove comment if admin", async () => {
			mockCommentsRepository.findOne.mockResolvedValue({ userId: "u1" });
			await service.remove("other", "c1", true);
			expect(repository.delete).toHaveBeenCalledWith("c1");
		});

		it("should throw NotFoundException if comment does not exist", async () => {
			mockCommentsRepository.findOne.mockResolvedValue(null);
			await expect(service.remove("u1", "c1")).rejects.toThrow(NotFoundException);
		});

		it("should throw ForbiddenException if not owner and not admin", async () => {
			mockCommentsRepository.findOne.mockResolvedValue({ userId: "u1" });
			await expect(service.remove("other", "c1")).rejects.toThrow(
				ForbiddenException,
			);
		});
	});

	describe("like", () => {
		it("should add like", async () => {
			mockCommentsRepository.findOne.mockResolvedValue({ id: "c1" });
			await service.like("u1", "c1");
			expect(mockCommentLikesRepository.addLike).toHaveBeenCalledWith("c1", "u1");
		});
	});

	describe("unlike", () => {
		it("should remove like", async () => {
			mockCommentsRepository.findOne.mockResolvedValue({ id: "c1" });
			await service.unlike("u1", "c1");
			expect(mockCommentLikesRepository.removeLike).toHaveBeenCalledWith(
				"c1",
				"u1",
			);
		});
	});
});