Add the BlogPageController that is referenced within
`my_module.routing.yml`.
We will need to return a render array, but for now let’s return an empty
array.
The test now passes as we are getting the expected response code.
Enable the node module within the test to add the `access content`
permission.
This fails, and returns a 500 response code rather than the expected 200
response code.
Add a `my_module.routing.yml` file that adds the missing route for
`/blog`.
This fails, and returns a 403 response code rather than the expected 200
response code.
Add the new `BlogPageTest` functional test to ensure that anonymous
users can access the `/blog` page.
This fails, and returns a 404 response code rather than the expected 200
response code.
