Prevent premature task completion by checking for parsing errors, execution failures, incomplete test results, and missing expected outputs. Acts as final quality gate before declaring tasks complete. Use proactively after major operations or when task success needs verification.
Generates comprehensive unit and integration tests using xUnit, FluentAssertions, and NSubstitute
Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion by presenting structured options
Kotlin testing with JUnit 5, MockK, Spring test slices, and Testcontainers. Provides mocking patterns, test slice selection, and TDD workflow for Spring Boot + Kotlin. Use when writing tests for Kotlin/Spring code, setting up test infrastructure, or debugging test failures.
Generate testable example extensions and run them in the Umbraco backoffice
Reusable test traits, base test cases, and 46 helper methods from tests/Support/ for efficient test authoring
JsonModels.Builders for creating test data in Umbraco tests
Generates unit tests and integration tests for Python code using pytest conventions. Use when creating tests for new functions, classes, or modules.
Complete browser automation with Playwright. Auto-detects dev servers, writes clean test scripts to /tmp. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use when user wants to test websites, automate browser interactions, validate web functionality, or perform any browser-based testing.
Pytest fixture design, conftest.py hierarchy, and DRY test code patterns. Identifies duplicate fixtures, plans fixture scope, and designs conftest.py structure. Use when creating test directories, refactoring test fixtures, or reviewing test code for duplication.
Create test plans, write tests, validate code quality through testing
Complete browser automation with Playwright. Auto-detects dev servers, writes clean test scripts to /tmp. Test pages, fill forms, take screenshots, check responsive design, validate UX, test login flows, check links, automate any browser task. Use when user wants to test websites, automate browser interactions, validate web functionality, or perform any browser-based testing.
TDD workflow: Generate tests BEFORE implementation. Use when user requests new feature or bug fix. Write failing tests first, then implement to pass. Creates unit, integration, and edge case tests.
Write unit tests for isolated business logic, Actions, DTOs, Services, and domain code using Pest v4. SUPPLEMENTARY to feature tests - use for complex, concentrated areas of the codebase that benefit from focused isolated testing. Feature tests should be your primary approach.
Generates comprehensive unit tests for functions and classes in multiple languages
BDD 測試實作技能，協助開發者使用 Reqnroll 撰寫行為驅動開發測試，包含 Gherkin 語法、測試步驟實作與 Docker 測試環境設定。
Master Rust testing - unit tests, integration tests, mocking, and TDD
Guide for writing tests using Fulcro Spec including specifications, assertions, mocking with when-mocking!, spying, and log capture. Use when writing or understanding tests in this codebase.
MUST USE for any browser automation tasks. Headless browser via agent-browser CLI - web interactions, scraping, testing, screenshots, login flows, and form submission. Uses ref-based element selection (@e1, @e2) from accessibility snapshots.
React testing with Vitest, React Testing Library, and MSW. Focuses on user-centric testing, component isolation, and API mocking. Use when writing tests for React components, hooks, or debugging test failures in frontend code.
Run pytest test suite for the video processing pipeline with coverage analysis. Use when the user wants to run tests, check test coverage, validate code quality, or verify pipeline functionality.
1600+ lines of testing mastery - unit tests, widget tests, integration tests, E2E, coverage, mocking with production-ready code examples.
Test utility services that handle external APIs or authorization logic. Use when testing services like AuthenticationService or AuthorizationService. Triggers on "test auth service", "test utility service", "test authentication".
