tdd-cycle

Test-Driven Development in Ruby on Rails is guided through the Red-Green-Refactor cycle: analyze requirements, select a test type, write a failing spec, implement minimal code to pass, and then refactor for clarity.

The Red-Green-Refactor cycle is a TDD workflow where you first write a failing test, implement the minimal code required to make it pass, and then refactor the implementation to improve code quality without changing behavior.

You can write TDD tests for Rails model validations and associations by following structured TDD patterns that guide you through selecting the correct model test type, writing the initial failing spec, and implementing the validation logic to verify it passes.

You should select system tests for end-to-end browser interactions and request tests for HTTP endpoint responses during the requirement analysis phase of the TDD cycle to ensure you are testing the correct application layer.

Common TDD anti-patterns to avoid include writing tests after implementation and skipping the verification of failing specs, which compromises the structured Red-Green-Refactor workflow and reduces test robustness.

Yes, the TDD workflow supports Rails service objects by providing specific patterns for writing failing specs, verifying the failures, implementing the minimal service code, and refactoring the logic to achieve passing tests.