Description
Currently, the RoR path does not have any testing lessons for Rails. This issue aims to resolve by adding a new lesson for API testing within a new testing section in the Ruby on Rails curriculum. There are many useful resources that go over system testing and you can find this within Rails guides here and by googling resources on it. This lesson should follow the style guide.

part of #214 in top meta

Acceptance Criteria

Important points to hit

• An explanation of why API testing is important.
• An explanation of integration testing.
• Why Integration testing is important.
• What is VCR.
• How to use VCR for testing.

Additional Information

The VCR github repo has useful information https://github.com/vcr/vcr as well as the Ruby on Rails guides for integration testing https://guides.rubyonrails.org/v5.1/testing.html#integration-testing.