text: Title: MEDIA_URL in the test settings
  Body: ## What happened?
  When running the tests in CI, this happens: 
  
  ```
  ERRORS:
  ?: (urls.E006) The MEDIA_URL setting must end with a slash.
  ```
  
  ## What should've happened instead?
  Successfully run the tests. I believe we need to add a trailing slash to `MEDIA_URL`. I can submit a PR.