Specifying the Requirement for the Route Handler With a Unit Test

The test for the handler of this route will check for the following conditions:

1. The handler responds with an HTTP status code of 200,
2. The returned HTML contains a title tag containing the title of the article that was fetched.

The code for the test will be placed in the TestArticleUnauthenticated function in the handlers.article_test.go file. We will place helper functions used by this function in the common_test.go file.