Parallel Test Execution in Playwright
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Parallel Test Execution in Playwright
When running automated tests, speed is critical—especially in large projects where test suites can quickly grow. Playwright offers built-in support for parallel test execution, helping teams reduce overall execution time and achieve faster feedback cycles.
By default, Playwright Test runs tests in parallel across multiple worker processes. Each worker runs independently, ensuring that your tests don’t interfere with one another. This isolation is achieved by creating a separate browser context for every test, making it safe to execute tests simultaneously.
You can control the number of workers using the --workers
flag or by configuring it in the playwright.config.ts
file. For instance, setting "workers": 4
allows four tests to run at the same time. Playwright intelligently distributes test files across available workers, balancing the load and maximizing efficiency.
Parallel execution becomes especially powerful in CI pipelines, where time savings are crucial. With cloud-based test runners, you can scale tests across multiple machines, further reducing execution time.
Best practices include designing tests to be independent, stateless, and idempotent. Avoid shared resources or hard-coded data that may cause flakiness in parallel runs. Using unique test data or environment-specific configurations ensures smooth execution.
In short, parallel testing in Playwright transforms test suites from time-consuming bottlenecks into efficient, scalable pipelines—boosting productivity and accelerating releases.
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