How can you run Playwright tests in parallel?

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Running Playwright tests in parallel improves test execution speed by leveraging multiple worker processes. Playwright’s built-in test runner (@playwright/test) supports parallel test execution out of the box.

Steps to run Playwright tests in parallel:

1. Use the Playwright Test Runner
   Ensure you're using Playwright’s test runner (@playwright/test), which supports parallelism natively.

2. Install Playwright Test (if not already):

3. Structure your tests into separate files
   Each test file can be executed in a separate worker thread.

4. Configure workers (optional)
   In the playwright.config.ts or playwright.config.js, set the number of parallel workers:If not set, Playwright uses the number of CPU cores by default.

5. Run tests
   Execute the following command:

6. Use test.describe.parallel (optional, for parallel within a file)
   If you want to run multiple tests in a single file in parallel:

Notes:

• Avoid shared state between tests to prevent race conditions.

• Each worker runs in its own browser context by default for isolation.

Running Playwright tests in parallel can significantly reduce test suite execution time while maintaining reliability and test independence.

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