Blog

Cypress cy.prompt: AI Test Authoring Guide (2026)

Master Cypress 15 cy.prompt in 2026: write plain-English steps that compile to real Cypress commands. Worked login/checkout example, determinism, CI, and limits.

Gatling vs k6: Load Testing Tools Compared (2026)

A deep, code-first comparison of Gatling and k6 in 2026: architecture, scripting, thresholds, CI/CD, Grafana observability, pricing, and when to pick each.

Playwright MCP Server + Claude Code: 2026 Setup Guide

Step-by-step guide to connect the Playwright MCP server to Claude Code so an AI agent drives a real browser via the accessibility tree to write and heal tests.

Playwright Self-Healing Tests: The 2026 Guide

Build resilient, self-healing Playwright tests in 2026 with role-based locators, the AI Healer agent, fallback locator helpers, selector-drift monitoring, and traces.

Promptfoo vs DeepEval vs RAGAS: LLM Eval Tools (2026)

A hands-on 2026 comparison of Promptfoo, DeepEval, and RAGAS: install, runnable Python and YAML examples, CI/CD gating, judge-token cost, and when to pick each.

pytest + Playwright Python: E2E Testing Tutorial (2026)

Learn end-to-end browser testing with Playwright Python and the pytest-playwright plugin: fixtures, locators, parametrization, traces, parallelism, and CI.

Selenium to Playwright Migration Guide (2026)

A practical 2026 guide to migrating a Selenium WebDriver suite to Playwright: API mapping table, locator strategy, waits, Page Objects, and AI-agent codemods.

Testcontainers Integration Testing: 2026 Guide

Use Testcontainers to spin up real Postgres, Redis, and Kafka in disposable Docker containers for integration tests. Java JUnit 5 and Python pytest examples, CI, and tuning.

Claude Code Subagents Testing: Build a QA Automation Team (2026)

A practical guide to Claude Code subagents testing -- design a QA team of test-planner, playwright-writer, and triager agents, run them in parallel, and ship Playwright tests faster.

Playwright ARIA Snapshots: toMatchAriaSnapshot Guide (2026)

Learn Playwright ARIA snapshots with toMatchAriaSnapshot. Assert the YAML accessibility tree instead of brittle CSS or screenshots, plus regex matching and CI tips.

Playwright Clock API: Mock Time & Fake Timers Guide (2026)

Master the Playwright Clock API to mock time and use fake timers. Control countdowns, polling, session timeouts, and "time ago" UI deterministically with page.clock.

Playwright Component Testing for React: Complete Guide 2026

Playwright component testing for React in 2026: mount real components in a real browser with @playwright/experimental-ct-react, props, events, page.route mocking, and config.

Reference

Playwright Mobile Emulation: Devices, Viewport & Config Reference

Playwright mobile emulation reference: the devices registry, viewport, deviceScaleFactor, isMobile, hasTouch, userAgent, and config projects per device.

Playwright Screencast & Video Recording: 1.59 API Guide (2026)

Master Playwright screencast and video recording: configure recordVideo, video modes, retain-on-failure, the 1.59 Screencast API for AI agents, and CI artifacts.

Postman vs Playwright for API Testing: 2026 Comparison

Postman vs Playwright for API testing in 2026: collection runner and GUI versus code-first APIRequestContext. Compare assertions, auth, CI, reporting, and verdict.

Cypress vs Playwright CI Cost: 2026 Benchmark Breakdown

Cypress vs Playwright CI cost compared with 2026 benchmarks: parallelization, CI-minute math, GitHub Actions sharding configs, flake cost, and a worked monthly delta.

LLM Observability vs Evaluation: 2026 Comparison Guide

LLM observability vs evaluation explained: evaluation gates CI before deploy, observability monitors live production traffic. See the differences, tools, and how they connect.

Reference

MCP Servers for Test Automation: 2026 Reference Guide

A reference guide to MCP servers for test automation in 2026: Playwright, Selenium, API, database, GitHub, Jira and more, with mcp.json config, chaining workflows, and a security checklist.

Playwright ARIA Snapshots: toMatchAriaSnapshot Guide 2026

Master Playwright ARIA snapshots with toMatchAriaSnapshot: YAML accessibility-tree assertions, inline vs external snapshots, regex names, partial matching, and a11y regression.

Playwright Self-Healing Locators: AI Guide for 2026

Learn how Playwright self-healing locators cut selector-maintenance PRs by 60-80% in 2026. Role-based locators, custom fallback wrappers, and AI re-identification, explained.

Reference

PLAYWRIGHT_BROWSERS_PATH: The Complete 2026 Reference

Canonical reference for PLAYWRIGHT_BROWSERS_PATH: default OS install paths, the 0 and custom-path modes, related env vars, Docker, CI caching, and monorepo gotchas.

pytest-playwright Plugin: The Complete 2026 Tutorial

Master the pytest-playwright plugin in 2026: fixtures, CLI flags, multi-browser runs, storage_state auth, parallel xdist, and trace debugging. Real Python examples throughout.

Ragas Faithfulness & Answer Relevancy: 2026 Guide

A practical 2026 guide to Ragas faithfulness and answer relevancy metrics: definitions, runnable Python code, context precision/recall, thresholds, CI gating, and pitfalls.

Selenium MCP Server: AI Browser Automation Guide 2026

Learn how the Selenium MCP Server lets AI agents drive Chrome and Firefox over WebDriver. Setup, mcp.json config, the full tool surface, and Selenium MCP vs Playwright MCP compared.

BFCL Explained: Berkeley Function-Calling Leaderboard for Tool Use (2026)

Berkeley Function-Calling Leaderboard (BFCL) explained: how this benchmark scores tool use with AST and executable evaluation, plus how to run it yourself.

CI/CD

CircleCI Test Automation: Parallelism, Orbs & Caching (2026)

CircleCI test automation guide for 2026 — split tests across parallel containers, reuse orbs, cache dependencies, and gate merges on store_test_results.

Performance

Core Web Vitals Testing: LCP, INP & CLS Automation (2026)

Core Web Vitals testing guide for 2026 — automate LCP, INP and CLS measurement with the web-vitals library, Lighthouse CI, Playwright and the CrUX API.

FactoryBot Tutorial 2026: Test Data Factories for RSpec & Rails

A practical FactoryBot tutorial for Rails: define factories, use build vs create vs build_stubbed, add traits, sequences, transient attrs, and associations.

Faker.js & Faker Python: Generate Realistic Test Data (2026)

Generate realistic test data with Faker.js (@faker-js/faker) and Faker Python: real APIs for names, emails, seeding, locales, uniqueness, and pytest fixtures.

G-Eval Explained: Chain-of-Thought LLM-as-Judge Scoring (2026)

G-Eval explained for 2026: how this chain-of-thought LLM-as-judge metric scores text, why it beats raw rubric prompts, and how to run G-Eval in DeepEval.

garak: LLM Vulnerability Scanning Tutorial (2026)

Hands-on garak tutorial for 2026: install the LLM vulnerability scanner, run probes against OpenAI, Hugging Face and Ollama models, and read the report.

Go Fuzzing Tutorial 2026: Native Fuzz Tests with go test -fuzz

Go fuzzing tutorial for 2026: write native fuzz tests with testing.F, run go test -fuzz, seed a corpus, triage crashing inputs, and wire fuzzing into CI.

Go httptest Tutorial: Testing HTTP Handlers & Servers (2026)

Learn Go httptest in 2026 to test HTTP handlers and servers: use ResponseRecorder, NewRequest, httptest.Server, table-driven tests, and mock upstreams.

GoMock + mockgen Tutorial 2026: Generating & Using Mocks in Go

Learn GoMock and mockgen in 2026: generate mocks from Go interfaces, wire up gomock.NewController, set EXPECT() calls, match args, and order calls in tests.

Performance

Gremlin Chaos Engineering Tutorial: Fault Injection for QA (2026)

A hands-on Gremlin chaos engineering tutorial for 2026 — install the agent, inject CPU, memory, latency and blackhole faults, and gate releases on resilience.

API Testing

gRPC API Testing: ghz, grpcurl & Contract Testing (2026)

A practical 2026 gRPC API testing guide: call services with grpcurl, load test with ghz, catch breaking .proto changes with Buf, and probe health checks.

JUnit 5 Parameterized Tests: ValueSource, CsvSource & MethodSource (2026)

JUnit 5 parameterized tests guide: @ParameterizedTest with @ValueSource, @CsvSource, @CsvFileSource, @MethodSource, @EnumSource, and argument conversion.

Kotest Tutorial 2026: Kotlin Testing with Specs, Matchers & Property Testing

A practical Kotest tutorial for Kotlin: spec styles, shouldBe matchers, data-driven testing with withData, property testing with checkAll, and Gradle setup.

MCP Tool Poisoning: How to Test and Defend Your MCP Server (2026)

MCP tool poisoning testing guide for 2026: how the attack hides instructions in tool descriptions, how to test your MCP server for it, and how to defend.

MockK Guide 2026: Mocking Kotlin Classes, Coroutines & relaxed Mocks

A practical MockK guide for Kotlin: mock classes with every/verify, stub suspend functions via coEvery/coVerify, use relaxed mocks, slots, spies, and JUnit 5.

Needle in a Haystack: Testing Long-Context LLM Recall (2026)

A needle in a haystack guide for 2026: how the long-context LLM recall test works, why position matters, and how to run NIAH and RULER on your own model.

Security

OWASP API Security Top 10: A Testing Checklist (2026)

A practical testing checklist for the OWASP API Security Top 10 (2023): real Burp, ZAP, and curl techniques to find BOLA, BFLA, and auth flaws in your APIs.

OWASP LLM Top 10: A QA Testing Checklist (2026)

A practical OWASP LLM Top 10 testing checklist for QA in 2026 — what to test for each risk (LLM01-LLM10), with real garak, promptfoo, and Presidio commands.

PyRIT Tutorial: Microsoft's AI Red-Teaming Framework (2026)

A hands-on PyRIT tutorial for 2026: install Microsoft's AI red-teaming framework, run single- and multi-turn attacks, score results, and wire it into CI.

CI/CD

ReportPortal Setup: AI-Powered Test Reporting & Analytics (2026)

ReportPortal test reporting guide: self-host with Docker, wire up pytest, Java, and JS agents, push launches via the REST API, and use ML auto-analysis.

RSpec Mocks Guide 2026: Doubles, Stubs, Spies & Verifying Doubles

A practical RSpec mocks guide: build doubles, stub with allow/and_return, set message expectations, use spies, and harden tests with verifying doubles.

Rust mockall Guide 2026: Mocking Traits & Structs for Unit Tests

Learn Rust mockall in 2026: mock traits with #[automock], mock structs via mock!, set expectations with returning, match args with predicates, and order calls.

Rust proptest Tutorial 2026: Property-Based Testing in Rust

Learn Rust proptest for property-based testing in 2026: write strategies, shrink failures, derive Arbitrary, tune ProptestConfig, and run regressions.

Shift-Right Testing in Production: Observability & QA (2026)

A 2026 guide to shift-right testing: use observability, synthetic monitoring, feature flags, canaries and SLOs to verify quality in production safely.