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Explore code coverage techniques for unit tests running in sub-processes and threads in this 35-minute EuroPython 2022 conference talk. Learn how to effectively measure and improve code coverage in open-source projects, both locally and through automated processes on GitHub. Discover the importance of code coverage as a metric for well-tested and reliable codebases, and understand the benefits of running tests in parallel. Follow along as the speaker demonstrates using coverage.py, building solutions for uncovered code, and configuring CI pipelines with GitHub Actions and Codecov. Gain valuable insights into optimizing test execution and maintaining high code coverage standards in your projects.