Testing Rails Applications with Minitest

Testing is a critical part of building stable Ruby on Rails applications, yet getting started with test suites can feel overwhelming. This course guides you through the process of writing clean, maintainable tests using Minitest, the lightweight and fast framework built directly into Ruby. You will transition from writing untested code to confidently verifying your application's behavior with every change. In this course, you will learn how to: - Understand core testing concepts, assertions, and the structure of a Minitest suite - Configure and run Minitest efficiently within a modern Ruby on Rails environment - Write unit tests for Rails models to validate data, associations, and business logic - Test controllers and system integration flows to ensure seamless user journeys - Apply test doubles and mocking techniques using Mocha to isolate external dependencies - Practice test-driven development workflows to write cleaner, more modular Rails code We begin with foundational testing terminology and the philosophy behind Minitest before moving step-by-step through models, controllers, and integration testing. This textbook-style course is designed for beginner Ruby on Rails developers who want to establish solid testing habits from the start, with no prior testing experience required. Start writing reliable Rails tests today.