Minitest is a testing suite for Ruby. It provides a complete suite of testing facilities supporting test-driven development (TDD), behavior-driven development (BDD), mocking, and benchmarking. It's small, fast, and it aims to make tests clean and readable.

When creating an app in Ruby on Rails, from the very beginning, on every single step of your developer's journey, you're going to use ActiveRecord methods. Lots of them, and frankly speaking, it's good to know them well (if not by heart).

Get up and running with Checkout and Ruby on Rails in no time at all! If you need help after reading this, check out our answers to common questions or chat live with other developers in #stripe on freenode.

RSpec is a mature, feature-packed testing framework, but the documentation can be difficult to navigate.The official documentation is written as a set of Cucumber tests within Relish. It’s very comprehensive, but also quite sparse, and Cucumber tests are kind of unnatural to read.

There are many ways to generate PDFs in Ruby and Rails. Chances are that you are already familiar with HTML and CSS, so we are going to use PDFKit to generate PDF files using HTML from standard Rails view and style code.