Developers
You built something. It works on your machine. You're pretty sure it works. But you also know that one day you'll change something and quietly break the login, or the checkout, or the thing that sends emails — and you won't know until a user
Testing Tools
Free website checkers typically test SEO, page speed, and meta tags — things that matter to search engines. They don't test whether your site works for users: whether forms submit, whether checkout completes, whether login succeeds. This guide covers what a complete free website check looks like and what
Test Automation
Testing Bootstrap components requires handling JavaScript-driven behavior — modals use .show/.hide classes, dropdowns toggle .show, tabs use aria-selected. Use explicit waits for animations: wait for .modal.show (not just .modal). For unit tests with React Bootstrap, use React Testing Library — screen.getByRole('dialog') for modals, screen.getByRole('
Testing Tools
Most "check my website" guides point you at SEO scores, Lighthouse audits, and uptime monitors. These tools are useful but they cannot tell you whether your site actually works for users. This guide is the practical checklist for checking what matters: can users complete the tasks your site
Test Automation
Vitest is a Vite-native test runner that replaces Jest for React projects. Set up with npm install -D vitest @testing-library/react @testing-library/user-event jsdom. Configure vitest.config.ts with environment: 'jsdom' and globals: true. Then write tests with render(), screen, and userEvent from React Testing Library — the API
Test Automation
Angular testing uses Jasmine + Karma by default for unit/component tests, but Jest is faster and increasingly preferred. Component testing uses Angular's TestBed to render components in isolation. For E2E testing, Playwright or Cypress replace the deprecated Protractor. The testing pyramid for Angular: many unit tests → some integration
Test Automation
In Selenium Python, find elements by class with By.CLASS_NAME (single class, no spaces) or By.CSS_SELECTOR with dot notation (.class-name, supports multiple classes). By.CLASS_NAME throws InvalidSelectorException if the class name contains spaces. For multiple classes use By.CSS_SELECTOR, ".class1.class2". For partial
AI-powered QA automation for developers and engineering teams.
The best QA tools in 2026: Playwright or Selenium for browser automation, pytest or Jest for unit testing, Postman for API testing, k6 for performance testing, HelpMeTest for AI-powered test generation and monitoring. The modern QA stack prioritizes AI-assisted test creation, self-healing tests, and flat-rate pricing over per-seat models. Key
Most website security testing tools check for malware, SSL certificates, and known vulnerabilities. They do not check whether your access controls actually work — whether a logged-out user can reach an admin page, whether a standard user can access another user's data, or whether your role permissions are enforced
A website that is "mobile-friendly" passes a responsive design check — the layout adapts to smaller screens. That is not the same as a website that works on mobile. Mobile functional testing verifies that users on phones and tablets can complete the same flows as desktop users: checkout, login,
Selenium has no direct By.TEXT locator. To find elements by text: use By.LINK_TEXT for exact link text, By.PARTIAL_LINK_TEXT for partial link text, or XPath //tag[text()='...'] for exact match on any element, or //tag[contains(text(), '...')] for partial match. CSS
API test automation verifies that your backend endpoints return correct data, status codes, and response times — automatically, on every code change. Use Python + requests + pytest for code-first testing, or Postman/Newman for GUI-first. Key tests: status codes, response schemas, auth flows, error handling, and edge cases. Integrate into GitHub Actions
NoSuchElementException in Selenium means find_element couldn't locate the element in the DOM. The most common causes: element hasn't loaded yet (fix: add WebDriverWait), element is inside an iframe (fix: switch to frame first), wrong selector (fix: verify in browser DevTools), or element is hidden/conditional
Screenshot testing captures images of your UI during automated tests and compares them against baseline images to detect visual changes. Playwright uses toHaveScreenshot() for pixel diffing. Percy and Chromatic add web-based diff review. HelpMeTest uses AI to detect actual visual flaws (broken layouts, invisible elements) without needing baselines. Run screenshot
Speed testing measures how quickly pages load. Functional testing measures whether the loaded page actually works. These are independent — a fast site can have broken features, and a slow site can have fully functional features. Both matter, but they matter for different reasons and require different tools. This guide covers
WebDriverWait is Selenium's explicit wait class. Import it with from selenium.webdriver.support.ui import WebDriverWait. Use it as WebDriverWait(driver, timeout).until(condition) where condition is an expected_conditions function or a callable. It polls every 500ms until the condition is true or timeout is reached. Key
Visual regression testing automatically compares screenshots of your UI before and after code changes to catch unintended visual differences. Tools take a baseline screenshot, then diff each new screenshot against it — flagging pixel-level changes for human review. AI-powered tools like HelpMeTest go further, detecting actual visual flaws (broken layouts, overlapping
Implicit wait in Selenium sets a global timeout applied to every find_element call: driver.implicitly_wait(10). The driver retries finding the element for up to 10 seconds before throwing NoSuchElementException. The problem: mixing implicit and explicit waits causes unpredictable behavior. Use explicit waits exclusively — set driver.implicitly_wait(
A QA automation engineer designs, writes, and maintains automated tests to catch bugs before code ships. Core skills: programming (Python or JavaScript), Selenium/Playwright, CI/CD pipelines, and API testing. Entry-level salary: $70K-$90K. Senior: $120K-$160K. The role is evolving fast with AI tools that generate and maintain tests