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headless-browser-test

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Actualizado26 de julio de 2026 a las 19:10

Run headless browser smoke and E2E tests for a web service. Use when verifying rendered web UI, checking browser errors, creating Playwright-style scenarios, collecting screenshots, or testing a deployed or local service through Chromium.

Instalación

Instalar con Codex o Claude Copia este prompt, pégalo en Codex, Claude u otro asistente, y deja que revise la página de la skill y la instale por ti.

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hikaMaeng

hikaMaeng/skills

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SKILL.md

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name	headless-browser-test
description	Run headless browser smoke and E2E tests for a web service. Use when verifying rendered web UI, checking browser errors, creating Playwright-style scenarios, collecting screenshots, or testing a deployed or local service through Chromium.

Headless Browser Test

Use the scripts first. Keep prompts short; let them enforce browser setup, artifacts, trace capture, and report shape.

The target URL is an input to this skill, never something it guesses or rewrites. Resolve a URL that is reachable from wherever the browser process runs, prove it is reachable, then test it.

Default Flow

Resolve the target URL from the user, the deploy report, service docs, or the local dev server output.
Prove the URL is reachable from the same environment that will run the browser:

curl -fsS <url> >/dev/null

Run a smoke test:

node .codex/skills/headless-browser-test/scripts/run-headless-browser-test.mjs --url <url>

For real E2E, write a small JSON scenario and run it with --spec.
If the user asks for durable repository tests, generate a Playwright template and fill only the marked TODOs:

sh .codex/skills/headless-browser-test/scripts/write-playwright-e2e-template.sh test/e2e

Load Only What You Need

references/environment.md: runtime requirements, missing Chromium or Playwright handling, and choosing a reachable URL.
references/scenario-authoring.md: scenario JSON format, stable locator contract, and fill-in templates for common tests.
references/operation.md: testing a deployed service, artifact paths, failure triage, and final-answer requirements.

Hard Rules

Resolve the browser and Playwright from the environment. If the runtime provides them globally, point HEADLESS_BROWSER_EXECUTABLE and HEADLESS_BROWSER_PLAYWRIGHT_ROOT at them rather than adding project dependencies for one-off browser evidence.
A missing browser in a container image is an image problem. Fix the image; do not add a workspace dependency to work around it.
When the browser runs somewhere other than the host that published the port, pass the address that resolves from the browser's side. Note that a page served from localhost is a secure origin and one served from another hostname is not, so APIs such as Web Crypto can behave differently — choose the URL deliberately and record which one was tested.
Test rendered behavior a user can see or operate. Do not assert implementation details.
Prefer role/name, label, text, alt text, title, and test id locators. Use CSS or XPath only when no stable user-facing or documented test hook exists.
Keep tests isolated. Do not rely on execution order, shared browser storage, or state left by a previous test.
Avoid uncontrolled third-party pages and services. Mock or constrain them when they affect the result.
Prefer auto-waiting locator actions and web-first assertions over manual sleeps or one-shot visibility checks.
Capture evidence under test/YYYYMMDD/<HHMMSS>_headless-browser-test/.
Final answers must include pass/fail, the tested URL, the report path, screenshots, and whether the run was smoke-only or scenario-based.

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name	headless-browser-test
description	Run headless browser smoke and E2E tests for a web service. Use when verifying rendered web UI, checking browser errors, creating Playwright-style scenarios, collecting screenshots, or testing a deployed or local service through Chromium.

Headless Browser Test

Use the scripts first. Keep prompts short; let them enforce browser setup, artifacts, trace capture, and report shape.

The target URL is an input to this skill, never something it guesses or rewrites. Resolve a URL that is reachable from wherever the browser process runs, prove it is reachable, then test it.

Default Flow

Resolve the target URL from the user, the deploy report, service docs, or the local dev server output.
Prove the URL is reachable from the same environment that will run the browser:

curl -fsS <url> >/dev/null

Run a smoke test:

node .codex/skills/headless-browser-test/scripts/run-headless-browser-test.mjs --url <url>

For real E2E, write a small JSON scenario and run it with --spec.
If the user asks for durable repository tests, generate a Playwright template and fill only the marked TODOs:

sh .codex/skills/headless-browser-test/scripts/write-playwright-e2e-template.sh test/e2e

Load Only What You Need

references/environment.md: runtime requirements, missing Chromium or Playwright handling, and choosing a reachable URL.
references/scenario-authoring.md: scenario JSON format, stable locator contract, and fill-in templates for common tests.
references/operation.md: testing a deployed service, artifact paths, failure triage, and final-answer requirements.

Hard Rules

Resolve the browser and Playwright from the environment. If the runtime provides them globally, point HEADLESS_BROWSER_EXECUTABLE and HEADLESS_BROWSER_PLAYWRIGHT_ROOT at them rather than adding project dependencies for one-off browser evidence.
A missing browser in a container image is an image problem. Fix the image; do not add a workspace dependency to work around it.
When the browser runs somewhere other than the host that published the port, pass the address that resolves from the browser's side. Note that a page served from localhost is a secure origin and one served from another hostname is not, so APIs such as Web Crypto can behave differently — choose the URL deliberately and record which one was tested.
Test rendered behavior a user can see or operate. Do not assert implementation details.
Prefer role/name, label, text, alt text, title, and test id locators. Use CSS or XPath only when no stable user-facing or documented test hook exists.
Keep tests isolated. Do not rely on execution order, shared browser storage, or state left by a previous test.
Avoid uncontrolled third-party pages and services. Mock or constrain them when they affect the result.
Prefer auto-waiting locator actions and web-first assertions over manual sleeps or one-shot visibility checks.
Capture evidence under test/YYYYMMDD/<HHMMSS>_headless-browser-test/.
Final answers must include pass/fail, the tested URL, the report path, screenshots, and whether the run was smoke-only or scenario-based.