playwright-test

Original：🇺🇸 English

Translated

Write a playwright test, make sure it runs, and is not flaky.

2installs

Sourceposthog/posthog

Added on2026-03-21

NPX Install

npx skill4agent add posthog/posthog playwright-test

SKILL.md Content

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Read @playwright/README.md for best practices, gotchas, and how to run tests.

Rules

Follow the best practices in the README strictly
After UI interactions, always assert on UI changes, do not assert on network requests resolving
Keep looping until all tests pass. Do not give up or ask the user for help. You must resolve every failure yourself.

Instructions

You are to plan an end to end playwright test for a feature.

Step 1: Plan the test(s) to be done.

Use the Playwright MCP tools (e.g.,

mcp__playwright__browser_navigate

,

mcp__playwright__browser_click

,

mcp__playwright__browser_screenshot

) to interact with the browser and plan your tests.

After your exploration, present the plan to me for confirmation or any changes.

Step 2: Implement the test plan

Write the tests, making sure to use common patterns used in neighbouring files.

Run the tests with

BASE_URL='http://localhost:8010' pnpm --filter=@posthog/playwright exec playwright test <file name> --retries 0 --workers 3

Debug any failures. Look at screen shots, if needed launch the playwright mcp skills to interact with the browser. Go back to step 1 after attempting a fix.

Step 3: Ensure no flaky tests

After all tests pass in the file, run with

--repeat-each 10

added to the command. This will surface any flaky tests.

If any test fails across the 10 runs, treat it as a real failure: go back to Step 2, debug, fix, and re-run Step 3. Do not proceed to Step 4 until every run of every test passes.

Step 4: Report

Once all tests pass, output a single line: Testing Complete