Run your test suite inside Docker Compose containers for isolated, reproducible CI builds. Includes a reusable Rails setup you can drop into any project.
A working SimpleCov config for Rails, line by line: what each setting does, which filters actually matter, and why your coverage number moves when you add one.
Master Test-Driven Development for better code architecture. Learn TDD workflow, avoid common mistakes, and build maintainable software. Developer guide with examples ✓
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