Expert-level Laravel Dusk browser testing skill for PHP/Laravel applications. Covers Chrome-based E2E testing, browser assertions, Page Objects, component testing, authentication helpers, and database integration.

Laravel PHP testing with PHPUnit, feature tests, browser tests with Dusk, database factories, mocking facades, and HTTP testing helpers.

Expert-level Lettuce BDD testing skill for Python applications. Covers Gherkin feature files, step definitions, terrain hooks, Selenium integration, data-driven scenarios, and migration guidance to Behave for modern projects.

Coverage-guided fuzz testing using libFuzzer for C/C++ applications to find memory corruption, buffer overflows, and crash-inducing inputs.

Automated open-source license compliance testing to detect license conflicts, copyleft violations, and license compatibility issues in dependencies.

Automated web performance auditing using Google Lighthouse for Core Web Vitals, accessibility, SEO, and best practices scoring with CI integration.

Testing LLM-powered features including output quality validation, hallucination detection, token usage monitoring, and prompt regression testing.

Security testing for LLM-powered applications including prompt injection, jailbreak detection, data leakage prevention, and AI safety testing.

Testing load balancer configurations including health check validation, routing algorithms, session affinity, failover behavior, and SSL termination.

Detect localization and internationalization defects including untranslated strings, text expansion overflow, RTL layout issues, and locale-specific formatting errors

Python-based load testing with Locust for writing user behavior scripts, distributed testing, real-time web UI monitoring, and custom load shapes.

Testing logging implementations including log level verification, structured logging validation, log rotation testing, and log aggregation pipeline testing.

Systematic memory profiling and leak detection in applications using heap snapshots, allocation tracking, and garbage collection analysis.

Consumer-driven contract testing for microservices using Pact, ensuring API compatibility and preventing integration breakages across service boundaries.

Accessibility testing for mobile apps including VoiceOver/TalkBack testing, touch target sizes, dynamic type support, and motor accessibility.

Scalable mobile testing using cloud device farms like AWS Device Farm, BrowserStack, and Firebase Test Lab for cross-device compatibility.

Comprehensive Mocha testing skill for writing robust unit and integration tests in JavaScript and TypeScript with Chai assertions, Sinon mocking, async patterns, and CI/CD integration.

MongoDB testing with in-memory MongoDB, aggregation pipeline testing, schema validation, indexing verification, and replica set testing.

Microsoft's built-in .NET testing framework covering test classes, data-driven tests, assertions, lifecycle management, mocking with Moq, and integration testing for C# applications.

API mocking with Mock Service Worker for browser and Node.js environments including request interception, response simulation, and network error testing.

Testing multi-tenant application isolation including data segregation, tenant-specific configuration, cross-tenant access prevention, and performance isolation.

Advanced mutation testing using Stryker, PIT, and mutmut to measure test suite quality by introducing controlled mutations and tracking kill rates.

Detect and eliminate N+1 query problems in database-backed applications through query counting, execution plan analysis, and ORM configuration auditing

Systematically generate negative test cases covering invalid inputs, unauthorized actions, missing required fields, exceeded limits, and malformed request payloads

Comprehensive Nemo.js test automation skill for PayPal's Selenium-based Node.js testing framework featuring view-driven locators, flexible configuration, Mocha integration, and scalable browser automation patterns.

NestJS application testing with @nestjs/testing, dependency injection mocking, e2e testing with supertest, guard testing, and pipe validation testing.

Network latency simulation and testing for measuring application behavior under various network conditions including high latency, packet loss, and bandwidth constraints.

Next.js application testing covering Server Components, App Router, API routes, middleware, dynamic routes, and SSR/SSG testing patterns.

Comprehensive NightwatchJS end-to-end testing skill with integrated Selenium WebDriver, built-in assertions, page objects, and parallel test execution for reliable browser automation in JavaScript and TypeScript.

HTTP request mocking with Nock for Node.js testing including request intercepting, response recording, and external API simulation.

Test notification systems for spam behavior including duplicate alerts, missing throttling, incorrect delivery channels, and notification preference violations

NUnit 3 constraint-based testing for C# covering Assert.That patterns, parameterized tests, setup/teardown, Moq mocking, test categories, and the fluent assertion model.

Security testing for OAuth2 implementations including authorization code flow, PKCE, token handling, redirect URI validation, and scope enforcement.

Validate progressive web app offline functionality including service worker caching, offline data persistence, sync-on-reconnect behavior, and graceful degradation

Automatically generating API tests from OpenAPI/Swagger specifications including request validation, response schema checking, and edge case generation.

OpenAPI/Swagger specification validation and testing to ensure API implementations match their documented contracts with automated drift detection.

Testing distributed tracing and observability instrumentation with OpenTelemetry including span verification, metric collection, and log correlation.

Integration with Google OSS-Fuzz for continuous fuzzing of open-source projects with automated bug filing and regression tracking.

Security testing skill based on OWASP Top 10, covering ZAP scanning, security headers, input validation, authentication, and authorization testing.

Testing pagination implementations including cursor-based, offset-based, keyset pagination with edge cases, performance, and consistency verification.

Payment gateway testing including Stripe, PayPal, and Square integration testing with sandbox environments, webhook verification, and error handling.

Testing PCI-DSS compliance for payment processing including encryption validation, access control testing, and secure data storage verification.

Testing PDF generation including layout verification, content accuracy, font embedding, accessibility (PDF/UA), and cross-platform rendering consistency.

Enforcing performance budgets in CI/CD including bundle size limits, load time thresholds, Lighthouse score gates, and resource count limits.

Comprehensive PHP testing with PHPUnit covering assertions, data providers, mocking, test doubles, database testing, and HTTP testing for reliable PHP application development.

Testing CI/CD pipeline configurations including build validation, deployment verification, rollback testing, and pipeline-as-code quality checks.

API testing skill using Playwright's built-in APIRequestContext for RESTful service validation, authentication flows, and API contract verification.

Comprehensive end-to-end testing skill using Playwright for web applications, covering page objects, selectors, assertions, waits, fixtures, and test organization.

Mobile web testing skill using Playwright device emulation covering responsive testing, touch interactions, viewport management, network throttling, geolocation testing, and mobile-specific UI patterns.

Network-level testing with Playwright including request interception, response mocking, network throttling, and HAR recording/replay.