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    Webapp Tester

    Webapp Tester

    by JustHandled Labs

    Run real Playwright E2E tests on your web app: login, checkout, and form flows across desktop and mobile viewports, with screenshots, traces, and console logs captured on every failure. Catches broken flows and UI regressions before release, and tells you the likely fix, not just that something broke.

    Updated Jun 2026
    Instant install

    $15

    · or 75 credits

    30-day refund guarantee

    Secure checkout via Stripe

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    Included in download

    • Test critical user journeys like login and checkout on multiple viewports.
    • Debug flaky UI interactions by capturing traces and console logs.
    • terminal, browser, env_vars automation included
    • Includes example output and usage patterns
    • Instant install

    Sample input

    Run an E2E test of the login flow on both desktop and mobile viewports. Check for success redirects and report any UI errors or failures found during the process.

    Sample output

    Browser Test Results

    • Coverage: Chromium, iPhone 13
    • Steps:
      • PASS: open login page
      • FAIL: submit valid credentials: expected /dashboard but stayed on /login; visible error "Account locked"
    • Artifacts:
      • screenshot: test-results/failure.png
    • Likely fix: Update seed data for the test user.

    About This Skill

    Professional E2E Browser Testing

    The WebApp Tester skill provides a production-grade automated testing workflow using Playwright. It solves the common problem of "flaky" or shallow AI-generated tests by implementing a structured, artifact-driven approach to browser automation. Instead of just clicking buttons and hoping for the best, this skill ensures your AI agent acts like a professional QA engineer.

    What it does

    • Comprehensive Coverage: Tests flows across desktop and mobile viewports (iOS/Android emulation).
    • Deep Diagnostics: Automatically captures screenshots, Playwright traces, and console logs on failure.
    • Smart Auth: Manages persistent authentication states, preventing redundant login steps across test suites.
    • Visual Regression: Implements screenshot comparison to catch UI regressions that functional tests might miss.
    • Step-Level Reporting: Provides clear, human-readable summaries of exactly where a flow broke.

    Why use this skill?

    Prompting an AI to "test my site" often results in generic scripts that fail on modern React/Next.js apps. This skill enforces test.step() patterns, proper locators, and environmental awareness. It handles dev servers, manages mobile emulation profiles, and produces actionable debugging data that tells you exactly why a test failed—saving you hours of manual reproduction.

    Supported Tools

    • Frameworks: Playwright (primary), Chromium, WebKit, Firefox.
    • Environments: Local dev servers (localhost), staging, and production.
    • Contexts: Mobile Safari, Mobile Chrome, Desktop Responsive.

    Use Cases

    • Test critical user journeys like login and checkout on multiple viewports.
    • Debug flaky UI interactions by capturing traces and console logs.
    • Verify responsive layouts using iPhone and Android emulation profiles.
    • Automate visual regression testing with full-page screenshot comparisons.
    • Persist authentication sessions to speed up multi-page test suites.

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    Security Scanned

    Passed automated security review

    Permissions

    Terminal / Shell
    Browser
    Environment Variables
    Read Files
    Write Files

    File Scopes

    ./test-results/**/*
    ./tests/**/*
    **/*.spec.ts
    **/*.test.js

    WebApp Tester needs terminal access to run Playwright test commands—the industry standard for browser testing in Node.js environments. These commands launch real browsers (Chromium, Firefox, WebKit) that execute test flows like login, checkout, and form submission. No system modifications occur; the skill only reads test configurations and writes test artifacts (reports, screenshots, videos) to help developers debug failures. The skill never modifies source code, never installs software beyond Playwright's documented setup, and makes no external network calls of its own. All testing happens locally on the user's machine against their chosen test environment (localhost, staging, or production URL). For first-time users, the skill will prompt the user to run npx playwright install if browsers are missing—it does not attempt to install them automatically without permission.

    Tags

    browser-automation
    e2e-testing
    playwright
    qa
    typescript

    Works with Claude Code and Codex. Requires Playwright to be installed (`npm install -D @playwright/test`). First-time users must run `npx playwright install` to download browsers. All testing runs locally; no cloud dependencies.

    Creator

    JustHandled Labs

    JustHandled Labs builds focused agent skills for the work nobody wants to do by hand. Each one is a single repeatable job done well: catching the security and data mistakes that quietly ship, keeping docs and tests honest, gating the commands an agent is about to run, sharpening writing, and handling the founder chores around launches, outreach, and brand setup. Not generic AI productivity. Specific workflows that are easy to run, review, and repeat. Maintained by H.J. Westerfield, with a background in communications, editing, project coordination, customer support, and practical AI systems. Tools for people who want useful automation without theatrical complexity.

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