Add test cases

[Sparktan24]

Make sure that the function for the comments counter is covered with unit tests using Jest.

Make sure that you have tests for all edge cases.

[ashmalzahra]

Hi @Sparktan24 ,

Your project is complete! ⚡🔥 There is nothing else to say other than... it's time to merge it
Congratulations! 🎉

Highlights 🎉🔥

• All checks passed ✔

Optional suggestions ☂

Every comment with the [OPTIONAL] prefix won't stop the approval of this PR. However, I strongly recommend you take them into account as they can make your code better. Some of them were missed by the previous reviewer and addressing them will really improve your application.

Cheers and Happy coding!👏👏👏

Feel free to leave any questions or comments in the PR thread if something is not 100% clear.
Please, remember to tag me in your question so I can receive the notification.

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