How to Run Selenium Tests in Parallel
Learn how to run Selenium tests in parallel locally and with Selenium Grid, plus common setup patterns, CI tips, and flakiness traps to avoid.
Notes from the testing trenches
Welcome to The SDET
A first-person blog from an SDET sharing practical insights on Selenium, Playwright, CI/CD pipelines, tackling flaky tests, and exploring AI testing tools.
Recent notes
Endtest Buyer Guide for Teams Testing Multi-Step React Forms With Validation, Drafts, and Save-and-Resume
A practical buyer guide for testing multi-step React forms with validation, drafts, and save-and-resume. Learn where Endtest fits for low-maintenance browser regression coverage.
How to Store Playwright Traces, Videos, and Screenshots in CI So Triage Stops Being Slow
Learn how to store Playwright traces in CI, capture videos and screenshots, and organize CI artifacts so failure triage is faster and more reliable.
How I Use Playwright Traces, Console Logs, and Network Timing to Reproduce CI-Only Browser Failures
A practical Playwright debugging workflow for reproducing CI-only browser failures using traces, console logs, request timing, and environment diffs.
How I Debug Playwright Tests That Fail Only After a Design System Token Change
A practical guide to debugging Playwright tests that fail after design system token updates, separating real regressions from harmless visual drift, and hardening selector stability.
How to Handle Dynamic Elements in Selenium
Learn how to handle dynamic elements in Selenium with stable locators, explicit waits, XPath patterns, fallback strategies, and practical debugging tips.
Selenium Page Object Model Tutorial
Learn Selenium Page Object Model with practical Python and Java examples, locator strategies, wait handling, and maintainability tips for SDETs and QA engineers.
How to Test Email Verification Flows with Selenium
Learn how to test email verification with Selenium using real inboxes, test email APIs, and CI-friendly patterns. Includes waits, token handling, edge cases, and an Endtest alternative.
How to Test Email Verification Flows with Playwright
Learn how to test email verification with Playwright using real inboxes, test email APIs, and disposable mailboxes. Includes setup patterns, code examples, CI tips, and when Endtest is a simpler alternative.
How to Handle Dynamic Elements in Playwright
Learn how to handle dynamic elements in Playwright with stable locators, auto-waiting, retries, and debugging patterns for dynamic UIs.
How to Build a Selenium Test Automation Framework from Scratch
Learn how to build a Selenium test automation framework from scratch with drivers, page objects, waits, config, screenshots, reporting, and CI/CD tips.
How to Use Claude to Refactor Playwright Tests
Learn how to use Claude to refactor Playwright tests safely, improve maintainability, and decide when human review or Endtest is the better option.
Selenium to Playwright Migration Guide
A practical Selenium to Playwright migration guide covering locators, waits, fixtures, assertions, CI updates, and when Endtest may be a simpler alternative.
How to Separate Product Bugs From Test Noise in CI Without Slowing Every Release
A practical guide to separating real product regressions from flaky tests, environment drift, and CI noise, without turning every release into a manual investigation.
How I Debug Flaky Playwright Tests Caused by Animation, Transitions, and Layout Shift
A practical first-person guide to debugging flaky Playwright tests caused by animation, CSS transitions, and layout shift, with techniques for stabilization, diagnostics, and better waits.
Endtest Review for Teams That Need Stable Browser Regression on Fast-Moving React Apps
A practical Endtest review for React app testing, focused on stable UI automation, browser regression testing, and reducing flaky test maintenance in fast-moving frontend teams.
Endtest Review for Teams Testing PDF Generation, Download Workflows, and Document Handoffs
A practical review of Endtest for PDF generation testing, file download validation, and document workflow automation across browser steps, CI/CD, and handoff-heavy QA flows.
Why CI Green Builds Still Miss Release Risk: The Signals I Check Before Trusting a Pipeline
A practical analysis of why green CI builds can still hide release risk, and the pipeline health signals I check for broken coverage, stale artifacts, weak assertions, and false green builds.
What to Check Before You Trust a Green CI Run on a Frontend Release Branch
A practical CI release checklist for frontend teams. Learn what to verify before trusting a green pipeline, from flaky tests and coverage gaps to build artifacts, environment drift, and deploy readiness.
How I Decide Whether to Mock, Stub, or Hit Real Services in Playwright E2E Tests
My practical decision framework for choosing when to mock, stub, or use real services in Playwright E2E tests without over-mocking away real bugs.
How to Test Downloaded PDFs, Invoices, and CSV Exports in Playwright Without Flaky File Checks
A practical Playwright tutorial for testing downloaded PDFs, invoices, and CSV exports by verifying real file content, avoiding flaky filename-only assertions, and handling CI file download pitfalls.
How to Use AI to Convert Selenium Tests to Playwright
Learn how to convert Selenium tests to Playwright with AI, what usually migrates cleanly, what still needs manual work, and when Endtest is a better migration target.
Endtest Review for QA Teams Testing Login, Session Handoffs, and Frequent UI Changes
A practical review of Endtest for QA teams that struggle with login flow testing, session-heavy web apps, authenticated workflow testing, and browser regression under constant UI changes.
What to Measure Before You Let AI Write Assertions in Your Test Suite
A technical guide to the reliability metrics, release gate signals, and governance checks teams should measure before trusting AI-generated test assertions in CI.
How to Debug Playwright Tests That Pass Locally but Fail After GitHub Actions Cache Changes
Learn how to debug Playwright tests that pass locally but fail in GitHub Actions after cache changes, with a root-cause workflow for cache invalidation, dependency drift, and build artifacts.
Endtest Review for Teams That Need Browser Coverage Across Fast-Moving Frontends
A practical first-person review of Endtest for teams that need cross-browser testing, UI regression coverage, and lower-maintenance browser testing as frontends change quickly.
How to Make Flaky Tests Less Expensive Without Hiding Real Release Risk
A practical analysis of flaky test cost, retry policies, quarantine tradeoffs, and ownership models that reduce noise without masking real release risk.
How to Evaluate AI Test Agents Before You Let Them Touch Checkout or Login Flows
A risk-based guide to evaluate AI test agents before using them on checkout or login flows, with criteria for auditability, failure transparency, and human approval.
Why Playwright Tests Fail Only in CI on Linux but Pass on Mac and Windows
A practical root-cause guide for Playwright tests that pass locally on Mac and Windows but fail in Linux CI, covering fonts, permissions, timing, containers, and browser environment drift.
How to Test AI-Powered UI Changes Without Turning Every Prompt Tweak into a Regression Fire Drill
A practical workflow for test AI-powered UI changes, catch prompt change testing issues, and validate AI frontend regression without brittle tests.
How to Use AI to Convert Manual Test Cases into Playwright Tests
Learn how to convert manual test cases to Playwright with AI, including prompt patterns, locator cleanup, review steps, CI integration, and when Endtest is the better alternative.
Endtest Review for Teams That Need Faster Browser Coverage Without Owning the Automation Headache
An SDET review of Endtest for browser coverage, cross-browser regression, and maintenance overhead, including where its agentic AI and self-healing tests help teams move faster.
Why Browser Tests Pass in Preview but Fail After Merge
A practical debugging checklist for browser tests that pass in preview but fail after merge, covering environment drift, caching, hidden dependencies, and timing issues.
How I Decide Whether a Flaky Test Is a Product Bug, a Test Bug, or a CI Bug
A practical framework for flaky test root cause analysis. Learn how to tell product bugs, test bugs, and CI flakiness apart without patching the wrong thing.
How to Store Playwright Test Artifacts in CI So Failure Triage Is Actually Fast
Learn how to store Playwright test artifacts in CI, including traces, screenshots, videos, and logs, so flaky failures are easier to reproduce and debug.
How to Test Shadow DOM and Iframes in Playwright Without Turning Every Locator Into a Guess
Learn how to test shadow DOM and iframes in Playwright with stable locators, frame handling patterns, and debugging tips for modern component-heavy apps.
How I Test AI-Generated Frontend Changes Before They Break the Release Branch
A practical SDET workflow for testing AI-generated frontend changes, catching selector drift, markup regressions, and behavior changes before they hit the release branch.
How to Use Endtest for Browser Coverage in CI Without Maintaining a Selenium Grid
Learn how to wire Endtest into CI for stable browser coverage, cross-browser smoke tests, and lower-maintenance regression checks without running your own Selenium Grid.
How to Test WebSocket-Driven UI Flows Without Chasing Race Conditions in E2E
A practical guide to test WebSocket-driven UI flows with Playwright and Selenium, covering synchronization, assertions, flaky test failure modes, and browser automation timing.
How to Debug AI-Generated Playwright Tests
A practical tutorial for debugging AI-generated Playwright tests, covering locators, waits, assertions, test structure, CI failures, and when Endtest is the simpler alternative.
How to Review AI-Generated Playwright Code
A practical SDET guide to review AI-generated Playwright code, covering locators, waits, assertions, fixtures, cleanup, and CI behavior.
How to Generate Playwright Tests with Cursor
Learn how to generate Playwright tests with Cursor, where AI generated Playwright code helps, and what still needs manual engineering for stable test automation.
How to Generate Playwright Tests with GitHub Copilot
Learn how to generate Playwright tests with GitHub Copilot, prompt it effectively, review AI-generated test code, and decide when Endtest is the simpler alternative.
How to Build a Playwright Test Framework from Scratch
A practical Playwright framework tutorial covering TypeScript structure, fixtures, page objects, config, reporting, CI, and maintainability tradeoffs.
What to Measure in Test Automation Maintenance Before Your Suite Becomes Expensive
An opinionated guide to the test automation maintenance metrics that matter most, including flaky rate, selector churn, suite ownership, and debugging time.
Endtest Buyer Guide for Small QA Teams That Need Browser Coverage Without Framework Sprawl
A practical buyer guide for small QA teams evaluating Endtest for browser coverage, test maintenance, and simpler ownership without framework sprawl.
How to Debug Flaky API-Plus-UI Flows When the Browser Is Not the Real Problem
A practical guide to debug flaky API and UI tests by tracing backend state, test data drift, async UI failures, and network timing issues before blaming the browser.
How to Test File Upload Components in Modern React Apps Without Flaky Selectors
A practical tutorial for testing file upload components in React with Playwright and Selenium, covering hidden inputs, drag-and-drop flows, reliable locators, and CI-friendly patterns.
How to Use Endtest for Regression Checks on Frequently Changing UI Flows
Learn how to build Endtest regression checks for volatile UI flows, combine visual checks with low-maintenance automation, and reduce flaky failures without constant framework rewrites.
AI-Generated Playwright Tests: Complete Example
A practical AI-generated Playwright tests example that shows how to review, harden, and maintain generated test code, plus when an AI test platform like Endtest is the simpler choice.
How to Generate Playwright Tests with ChatGPT
Learn how to generate Playwright tests with ChatGPT, write better prompts, review AI-generated code, and decide when a low-code platform is a better fit for reliable automation.
How to Generate Playwright Tests with Claude
Learn how to generate Playwright tests with Claude, review the output, harden locators, and keep AI generated Playwright code maintainable in CI.
Endtest Review for QA Teams Replacing Fragile Selenium Suites in Fast-Moving UIs
An objective Endtest review for QA teams replacing fragile Selenium suites, covering migration effort, flaky test reduction, editable regression tests, and where low-code automation fits best.
What to Test in CI Before You Trust a New Release Pipeline
A practical guide to test a release pipeline in CI, covering build steps, environment parity, test ordering, artifacts, and failure reporting before you trust a new deployment flow.
Playwright Test Data Strategies That Keep Your Suite Stable
A practical guide to Playwright test data strategies, including seeded data, API setup, cleanup, and parallel-safe records for deterministic test automation.
How to Test AI-Powered Form Validation Without Trusting the Model Too Much
A practical guide to testing AI-powered form validation with deterministic assertions, mocks, and human review, including Playwright examples, flaky test controls, and CI strategies.
How to Use Endtest for Screenshot-Based Regression Checks Without Writing a Heavy Framework
Learn how to add Endtest screenshot regression checks to a small QA workflow, compare visual regressions, reduce flaky maintenance, and avoid building a custom framework first.
How to Debug Flaky Playwright Tests with Trace Viewer, Logs, and Timing Clues
A practical workflow to debug flaky Playwright tests using trace viewer, console logs, screenshots, and timing clues, without rewriting your whole suite.
Why E2E Tests Fail in CI but Pass Locally: A Root Cause Checklist
A practical checklist for debugging CI only failures in end-to-end tests, covering environment drift, timing issues, secrets, viewport differences, containers, and browser automation debugging.
Playwright Network Interception Tutorial for Testing APIs, Auth, and Third-Party Calls
Learn how I use Playwright network interception to mock API responses, stabilize auth flows, and isolate flaky third-party calls with practical examples and tradeoffs.
How to Stop Flaky Playwright Tests Before They Reach CI
A practical debugging workflow to stop flaky Playwright tests before they reach CI, with isolation tactics, locator checks, retry analysis, and stability patterns.
Codex Was Great Until Our Test Automation Task Needed More Reasoning Time
A practical SDET perspective on why Codex can feel impressive for small coding tasks, but test automation often needs long reasoning chains, debugging, and reruns that quickly hit usage limits. Includes Playwright, Selenium, and an alternative built for editable tests.
When Claude Runs Out of Usage Before Your Regression Fix Is Done
A first-hand look at a critical regression test fix interrupted by Claude usage limits, why that creates release risk, and why editable test platforms like Endtest can be more reliable for urgent automation work.
Claude Code Limits and the Pain of Maintaining a Growing Test Automation Framework
A real-world look at Claude Code limits test automation work in a growing Playwright framework, where context, debugging, and maintenance overhead start to dominate. Includes practical alternatives like Endtest.
When Codex Hit Its Limit in the Middle of Debugging Our Test Automation Framework
A practical SDET experience with Codex test automation limits while debugging a growing Playwright framework, and why purpose-built AI testing tools can be a better fit.