comments.service.spec -snippet

  describe('updateComment', () => {
    it('should call commentsRepository.findOne() once with correct query', async () => {
      // Arrange
      const testPostId: string = 'id1';
      const testCommentId: string = 'com';
      let testUserEntity: User;
      const testUpdateCommentDTO: UpdateCommentDTO = {
        message: 'blabla',
      };
      const testShowCommentDTOarray: ShowCommentDTO[] = [{
        id: 'com',
        message: 'blabla',
        user: testUserEntity,
        commentLikes: 0,
        commentDislikes: 1,
        createdOn: new Date(),
        UpdatedDateColumn: new Date(),
      }];
      const testCommentEntity: Comment = {
        includes: null,
        id: 'com', // same as the DTO of the comment
        message: 'blabla',
        user: Promise.resolve(testUserEntity),
        post: null,
        commentsLikesDislikes: null,
        createdOn: new Date(),
        UpdatedDateColumn: new Date(),
        isDeleted: false,
      };
      const testCommentEntityArray: Comment[] = [{
          includes: null,
          id: 'com', // same as the DTO of the comment
          message: 'blabla',
          user: Promise.resolve(testUserEntity),
          post: null,
          commentsLikesDislikes: null,
          createdOn: new Date(),
          UpdatedDateColumn: new Date(),
          isDeleted: false,
      }];
      testUserEntity = {
        id: '1',
        username: 'Кирчо',
        email: 'kircho@abv.bg',
        password: 'kirchoTheBadVibesKiller00!',
        firstName: 'Greatest',
        lastName: 'Ever',
        friended: null,
        beFriendedBy: null,
        posts: null,
        comments: Promise.resolve(testCommentEntityArray),
        postLikesDislikes: null,
        commentsLikesDislikes: null,
        activities: null,
        roles: null,
        createdOn: new Date(),
        UpdatedDateColumn: new Date(),
        isDeleted: false,
      };

      const commentsRepoFindOne = jest.spyOn(commentsRepository, 'findOne')
      .mockImplementation(() => Promise.resolve(testCommentEntity));

      const commentsRepoSave = jest.spyOn(commentsRepository, 'save')
      .mockImplementation(() => Promise.resolve(testCommentEntity)); // Or Entity ...

      const converterServiceConvertToShowCommentDTO = jest.spyOn(converterService, 'convertToShowCommentDTO')
      .mockImplementation(() => Promise.resolve(testShowCommentDTOarray));

      const query = {
        id: 'com',
        isDeleted: false,
      };
      // Act
      await service.updateComment(testUpdateCommentDTO, testCommentId, testUserEntity);
      // Assert
      expect(commentsRepoFindOne).toBeCalledTimes(1);
      expect(commentsRepoFindOne).toBeCalledWith(query);

      commentsRepoFindOne.mockRestore();
      commentsRepoSave.mockRestore();
      converterServiceConvertToShowCommentDTO.mockRestore();
    });