red-test-patterns

To write a RED phase test, you generate a Minitest template expecting a specific failure, such as a NameError for a missing model. This approach drives development with clear expectations by validating the test fails for the correct reason before code exists.

The best way to set up fixtures for failing Rails controller tests is to define example fixture data supporting associated records. This ensures your RED phase tests have the necessary database state to fail correctly due to missing implementation rather than missing test data.

Yes, you can generate RED phase Minitest templates for Rails service objects and policies. The templates provide the appropriate test structure, expected failure guidance, and run commands to verify the missing class or policy fails first.

You can run a single Minitest file or target a specific test by name using provided run commands. This isolates the failing RED test, confirming it fails because the target route, class, or component does not exist yet.

A Rails view component test fails before creation because the RED phase template expects the component class to be missing. This controlled failure validates your TDD workflow, ensuring the implementation must be built to satisfy the expected test behavior.

No, you do not need existing implementation code to start TDD. You can draft complete failing Minitest test files with expected failure behavior and fixture guidance before any models, controllers, or service objects exist.