#161291011 Add comment on an article

[sulenchy]

What does this PR do?

Add comment on an article

Description of Task to be completed?

• add addCommentOnArticle method
• add addCommentOnArticle route
• test the method

How should this be manually tested?

• clone this repo, cd into it and checkout the branch feature/161291011/comment-on-articles
• set up your .env variables and local database
• run npm install to install required packages
• run npm start to start up the server
• use postman(or any api testing tool) to test the following routes

• first sign up a user using POST http://localhost:{PORT}/api/v1/users/signup getting the valid credentials
• then test the route using POST http://localhost:{PORT}/api/v1/articles/{articleId}/comments

Any background context you want to provide?

N/A

What are the relevant pivotal tracker stories?

#161291011

Screenshots (if appropriate)

Questions:

N/A

[coveralls]

Pull Request Test Coverage Report for Build 496

• 23 of 24 (95.83%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 92.462%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
server/controllers/CommentController.js	9	10	90.0%

Totals
Change from base Build 471:	0.1%
Covered Lines:	454
Relevant Lines:	474

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💛 - Coveralls

[augustineezinwa]

I don't think you validated for an article that does not exist. What happens if I try to add a comment to a non-existent article with an id 1000? what happens if the id is not a number? Do well to cover the above edge cases.