Unit Testing

Use for testing tasks including test strategy design, writing Vitest unit/integration tests, ensuring coverage, and exploring edge cases. Activate when creating tests, reviewing test coverage, or designing test strategies.

Bash Automated Testing System (BATS) for TDD-style testing of shell scripts. Use when: (1) Writing unit or integration tests for Bash scripts, (2) Testing CLI tools or shell functions, (3) Setting up test infrastructure with setup/teardown hooks, (4) Mocking external commands (curl, git, docker), (5) Generating JUnit reports for CI/CD, (6) Debugging test failures or flaky tests, (7) Implementing test-driven development for shell scripts.

Workflow for modifying DQMC C code, adding new measurements, and running tests. Use when editing source code, implementing new observables, debugging, or validating code changes.

Simulates command execution in dry-run mode without file modifications. Sets dry_run flag, executes command with read-only constraint, then resets flag. Useful for testing workflows safely. Triggers on keywords: dry run, simulate, test command, preview changes, safe mode, no write

Generate regression tests when bugs are discovered during /debug or continuous checks. Auto-detects test framework, creates Arrange-Act-Assert tests, and links to error-log.md entries. (project)

Generates or updates an AGENTS.md file by scanning a repository for structure, commands, tests, and conventions. Use when a user asks to create or improve `AGENTS.md` for a repository.

Guides manual staging validation before production deployment through smoke tests, critical user flow testing, data migration verification, and rollback capability checks. Use when validating staging deployments, running pre-production tests, or preparing for production promotion in staging-prod deployment model. (project)

Suite of tools to fetch TOPSAIL CI logs and artifacts for test troubleshooting

PowerShell TDD testing framework guidance for Pester v5+. Use when writing, structuring, or debugging PowerShell unit tests; mocking cmdlets, native commands (bash, git, curl), or .NET types; isolating tests with TestDrive/TestRegistry; capturing output streams; generating code coverage or JUnit/NUnit reports for CI/CD; running parameterized or tagged tests; or troubleshooting Pester Discovery vs Run phase issues.

Executes implementation tasks using Test-Driven Development, prevents code duplication through anti-duplication checks, and maintains quality through continuous testing. Use when implementing features from tasks.md, during the /implement phase, or when the user requests TDD-based implementation. (project)

Comprehensive unit testing framework for Bash and POSIX shell scripts using ShellSpec with TDD/BDD best practices. Use when writing tests for shell scripts, debugging test failures, refactoring scripts for testability, setting up test infrastructure, mocking external dependencies, or implementing test-driven development for Bash/shell projects. Covers test structure, isolation, mocking, output capture, coverage, CI integration, and troubleshooting.

Generate Docker Compose and Dockerfile configurations for local development through interactive Q&A. Supports PHP/Laravel, WordPress, Drupal, Joomla, Node.js, and Python stacks with Nginx, Supervisor/PM2, databases, Redis, and email testing. Always asks clarifying questions before generating configurations.

Comprehensive CI/CD pipeline methodology with quality gates, release automation, smoke testing, observability, and performance tracking. Use when setting up CI/CD from scratch, build time over 5 minutes, no automated quality gates, manual release process, lack of pipeline observability, or broken releases reaching production. Provides 5 quality gate categories (coverage threshold 75-80%, lint blocking, CHANGELOG validation, build verification, test pass rate), release automation with conventional commits and automatic CHANGELOG generation, 25 smoke tests across execution/consistency/structure categories, CI observability with metrics tracking and regression detection, performance optimization including native-only testing for Go cross-compilation. Validated in meta-cc with 91.7% pattern validation rate (11/12 patterns), 2.5-3.5x estimated speedup, GitHub Actions native with 70-80% transferability to GitLab CI and Jenkins.

Create and run unit tests following the project's architecture and guidelines (Robolectric, naming, location).

Python Test-Driven Development expertise with pytest, strict red-green-refactor methodology, FastAPI testing patterns, and Pydantic model testing. Use when implementing Python features with TDD, writing pytest tests, testing FastAPI endpoints, developing with test-first approach, or when user mentions 'Python TDD', 'pytest', 'FastAPI testing', 'red-green-refactor', 'Python unit tests', 'test-driven Python', or 'Python test coverage'.

Use when sending emails - ActionMailer with async delivery via SolidQueue, templates, previews, and testing

TypeScript/JavaScript Test-Driven Development with Vitest, strict red-green-refactor methodology, React component testing, and comprehensive coverage patterns. Use when implementing TypeScript features with TDD, writing Vitest tests, testing React components, developing with test-first approach, or when user mentions 'TypeScript TDD', 'Vitest', 'React testing', 'JavaScript TDD', 'red-green-refactor', 'TypeScript unit tests', or 'test-driven TypeScript'.

Generate pull request descriptions following Grey Haven Studio standards with clear summary, motivation, implementation details, testing strategy, and comprehensive checklist. Use when creating or reviewing pull requests.

Decompose Linear todos into actionable, testifiable chunks with rationale, as-is/to-be analysis, expected outputs, and risk assessment for effective project management

Comprehensive test suite generation with unit tests, integration tests, edge cases, and error handling. Use when generating tests for existing code, improving coverage, or creating systematic test suites. Triggers: 'generate tests', 'add tests', 'test coverage', 'write tests for', 'create test suite'.