Backend: Implement unit tests for APIs related to Post and Comment models.

[bayndrysf]

Description: It needs to implement unit tests for APIs related to Post model. This is to track the testing process for APIs as listed below.

• POST : api/post/create-post :heavy_check_mark:
• POST : api/post/update/\/ :heavy_check_mark:
• POST : api/post/delete/\/ :heavy_check_mark:
• GET : api/post/fetch/\/ :heavy_check_mark:
• POST : /api/post/create-comment/{slug} :heavy_check_mark:
• POST : /api/post/update-comment/{slug}/{id} :heavy_check_mark:
• POST : /api/post/delete-comment/{slug}/{id} :heavy_check_mark:
• GET : /api/post/fetch-comment/{slug}/{id} :heavy_check_mark:
• POST : /api/post/upvote-post/{slug} :heavy_check_mark:
• POST : /api/post/downvote-post/{slug} :heavy_check_mark:
• POST : /api/post/upvote-comment/{slug}/{id} :heavy_check_mark:
• POST : /api/post/downvote-comment/{slug}/{id} :heavy_check_mark:

Deadline: 27.12.2022, 12.45(GMT+3)

[bayndrysf]

Unit test for POST : api/post/update/ and POST : api/post/delete/ were completed. See: 0136c2aaee07614b8b2ded78cd2837760d44d5cc eb2c1b0daedca63846e389088b2c67d9fc58946c .

[bayndrysf]

Unit test for GET : api/post/fetch/\/ was completed. See: f50b9d9268c43ee7e241266d90a9eb2c0d0bf1d5.

[bayndrysf]

Unit tests for the following endpoints were completed.

• POST : /api/post/create-comment/{slug} See: b0394517a1eebb42a2871c774984a03fdc19357c
• POST : /api/post/update-comment/{slug}/{id} See: d94c72f0eda3f43d8aba806cfe9550a901c39a0e
• POST : /api/post/delete-comment/{slug}/{id} See: c6a28770f85d9a2c12830251efc81a65f1111682
• GET : /api/post/fetch-comment/{slug}/{id} See: de132b11a40fc0ee24ddd94fef9d5165a97db2aa

[bayndrysf]

Unit tests for the following endpoints were completed.

• POST : /api/post/upvote-post/{slug} See: 9cf8c8c3aa26d037d3905e2cb300f7561c188fec
• POST : /api/post/downvote-post/{slug} See: 94554058bc9b36c11d9893b83f84e519a83bc177
• POST : /api/post/upvote-comment/{slug}/{id} See: 58eba0ba22cc62748b84cd878d10702b2561e8a4
• POST : /api/post/downvote-comment/{slug}/{id} See: 0124b48f1c6498b6752ee318594d71c4bb1db1e1