Let say you want to build your API to comply jsonapi.org specification and the result should look like:

Test for Serializer object may look like this:

Serializer object may look like this:

When we run our "serializers" specs everything passes.

That's pretty boring. Let's introduce a typo to our Article Serializer: Instead of type: "articles" let's return type: "events" and rerun our tests.

Once you've run the test it's pretty easy to spot the error.

Once you fix the error (correct the type to be article) you can introduce it to Controller like this:

This example is based on article: http://www.eq8.eu/blogs/30-pure-rspec-json-api-testing (opens new window)