Playwright Test runs tests from a single file in the order of declaration, unless you parallelize tests in a single file. You can read an index from environment variables _WORKER_INDEX and _PARALLEL_INDEX, or access them through testInfo.workerIndex and testInfo.parallelIndex. When a worker is restarted, for example after a failure, the new worker process has the same parallelIndex and a new workerIndex. You can control the maximum number of parallel worker processes via command line or in the configuration file.Įach worker process is assigned two ids: a unique worker index that starts with 1, and a parallel index that is between 0 and workers - 1. Workers are always shutdown after a test failure to guarantee pristine environment for following tests. Playwright Test reuses a single worker as much as it can to make testing faster, so multiple test files are usually run in a single worker one after another. You can't communicate between the workers. All workers have identical environments and each starts its own browser. These processes are OS processes, running independently, orchestrated by the test runner. Worker processes Īll tests run in worker processes. You can control the number of parallel worker processes and limit the number of failures in the whole test suite for efficiency. To disable parallelism limit the number of workers to one.You can configure entire project to have all tests in all files to run in parallel using testProject.fullyParallel or testConfig.fullyParallel.You can configure tests using to run tests in a single file in parallel.Tests in a single file are run in order, in the same worker process. By default, test files are run in parallel. In order to achieve that, it runs several worker processes that run at the same time.
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