testing▌

Jest test patterns and best practices for NestJS unit, integration, and e2e testing. \n \n Covers the testing pyramid: unit tests for pure logic, integration tests with real providers using Test.createTestingModule , and e2e tests with supertest for HTTP APIs \n Provides patterns for mocking external services with jest.fn and test doubles, plus in-memory database adapters and test containers for data layer testing \n Emphasizes deterministic tests with proper mock reset between runs, avoiding sh

You are an expert in App Store product page optimization and A/B testing. Your goal is to help the user design, run, and interpret tests that improve their App Store conversion rate.

Downloads artifacts from a GitHub Actions integration test run, generates a summarized skill invocation report, and files GitHub issues for each test failure with root-cause analysis.

Interactive browser automation with snapshot-based element references and multi-session support. \n \n 40+ commands across navigation, interaction, keyboard/mouse control, storage management, network mocking, and DevTools integration \n Automatic page snapshots after each command with element references (e.g., e15 ) for reliable, context-aware interactions \n Multi-browser support (Chrome, Firefox, WebKit, Edge) with persistent profiles, session management, and named browser instances \n Built-i

Comprehensive Java testing with JUnit 5, Mockito, and integration testing frameworks. \n \n Covers unit testing with JUnit 5 (parameterized tests, lifecycle annotations, extensions), mocking with Mockito (stubbing, verification, BDD style), and fluent assertions with AssertJ \n Includes integration testing patterns using Spring Boot Test slices, Testcontainers for database isolation, and MockMvc for API testing \n Provides test data builders, TDD/BDD practices, and JaCoCo coverage configuration

Iterative test-debug-fix cycles for Airflow DAGs with comprehensive failure diagnosis. \n \n Start with af runs trigger-wait <dag_id> to run a DAG and wait for completion; no pre-flight checks needed \n On failure, use af runs diagnose for comprehensive failure summary and af tasks logs to inspect error details from specific tasks \n Supports custom configuration, timeouts, and retry attempts; handles success, failure, and timeout scenarios with clear response interpretation \n Quick valida

Cross-browser E2E testing with Page Objects, authentication, and CI/CD integration. \n \n Supports three browser engines (Chromium, Firefox, WebKit) plus mobile viewports with parallel test execution and automatic retries \n Page Object Model pattern with base classes, role-based locators, and web-first assertions that auto-wait and retry \n Built-in authentication setup, API mocking, visual testing, and comprehensive dead link detection across entire sites \n GitHub Actions integration with art

Jest testing patterns, factory functions, and TDD workflows for unit test development. \n \n Covers TDD red-green-refactor cycle, behavior-driven testing focused on public APIs, and factory pattern for reusable test data and component props \n Provides custom render utilities, mock strategies for modules and GraphQL hooks, and structured test organization with describe blocks \n Includes query patterns (getBy, queryBy, findBy), user interaction simulation with fireEvent, and anti-patterns to avo

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Fast, persistent browser automation with session continuity across sequential agent commands. \n \n Supports three browser modes: headless Chromium, real Chrome with profile support, and cloud-hosted remote browsers with proxy configuration \n Includes 15+ command categories covering navigation, page inspection, interactions, data extraction, cookie management, and JavaScript execution \n Offers cloud session management, local server tunneling via Cloudflare, and parallel subagent execution thro