Library › Book 13 › Parallel Execution, Sharding, and CI/CD Integration
Parallel Execution, Sharding, and CI/CD Integration
16.1🔒Learning ObjectivesBy the end of this chapter, you will be able to:
16.2🔒Parallel ExecutionPlaywright runs tests in parallel by default. Understanding how parallelism works helps you configure it correctly.
16.3🔒GitHub Actions Integrationfail-fast: false: Do not cancel other shards when one fails. You want the complete picture, not just the first failure.
16.4🔒Docker IntegrationPlaywright provides official Docker images with all browsers and system dependencies pre-installed. Using these ensures your CI environment…
16.5🔒Retry StrategyRetries are a tool, not a solution. Used correctly, they handle genuine environmental flakiness while you fix root causes. Used…
16.6🔒Artifact ManagementWhen tests fail in CI, artifacts are your only debugging tool. Configure them carefully:
16.7🔒Exercises1. Run your test suite with 1, 2, 4, and 8 workers 2. Measure execution time for each configuration 3. Find the sweet spot where adding…
16.8🔒Q&AQuiz1. What is the difference between workers and shards? a) They are the same thing b) Workers are parallel processes on one machine; shards…
16.9🔒Key Takeaways- Parallel execution uses workers (processes on one machine) and shards (distribution across machines). - CI pipelines should upload…
16.10🔒Career Translation- "Designed CI/CD pipeline with 4-shard parallel execution, reducing test suite runtime from 45 minutes to 12 minutes" - "Implemented retry…
16.11🔒Q&AInterview Depth CheckPrompt: "Your test suite takes 60 minutes in CI. How would you reduce it to 15 minutes?"