minitest-testing

What problem does it solve?

Many Rails applications have incomplete, brittle, or inconsistent tests that make refactors risky and slow down delivery. This Skill helps engineers write, review, and improve Minitest tests so test suites are reliable, fast, and aligned with Rails conventions.

Core Features & Use Cases

• Model, Controller, and System Test Patterns: Provides idiomatic examples for validations, associations, HTTP behavior, and end-to-end workflows with Capybara and Turbo.
• Fixtures & Test Helpers: Demonstrates fixture usage, setup/teardown patterns, authentication helpers, and custom assertions to reduce duplication.
• Debugging & Coverage Guidance: Helps diagnose failing tests, suggests fixes, recommends assertions, and shows how to run tests in parallel and collect coverage with SimpleCov.
• Use Cases: Writing new tests for models/controllers, converting flaky feature specs to stable system tests, fixing CI test failures, and adding Turbo/Hotwire-aware system tests.

Quick Start

Ask the assistant to review failing tests in test/models/article_test.rb, identify root causes, and propose corrected test code and fixture updates.