How To Code Well

165 - Flaky Tests

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Changelog

  • I’ve sorted the Kubernetes ingress controller for the staging deployment of howtocodewell.net
  • I’ve got a few problems with connecting services outside of the Kubernetes cluster but I am working my way through those.
  • I’ve been updating the pipelines to allow for certain manual jobs in GitLab.

    • News/articles

    Python ASGI The future of Python Web Development

    A new asynchronous standard for Python web applications.

    WSGI = Web Server Gateway Interface

    ASGI = Asynchronous Server Gateway Interface

    https://www.infoworld.com/article/3658336/asgi-explained-the-future-of-python-web-development.html

    Podcast 2.0

    I have my eye on the podcast 2.0 movement and may start to add some backlog tickets to investigate what is involved from a technical standpoint to updating the RSS feeds.

    https://medium.com/@everywheretrip/an-introduction-to-podcasting-2-0-3c4f61ea17f4

    • The Podcast Index
    • Podcasting Namespace
    • PodPing
    • Value-For-Value

      • Send Symfony logs to Slack

      This could be a neat little future video tutorial. I could also do something similar with a Discord bot.

      https://manyou.blog/send-symfony-logs-to-slack-with-symfony-notifier-as-a-monolog-handler


      What’s a flaky test

      A flaky test is a test that sometimes passes and sometimes fails. This usual happens randomly and is incredibly annoying.

      What causes flaky tests

      • Under powered resources
      • Tests running in random order
      • Tests not cleaning themselves up afterwards
      • External programs or requests interfering with the tests

        • How to fix flaky tests

        • Run tests more regularly
        • Separate flaky tests and run them in isolation until fixed
        • Only test what is needed based on what has changed
        • Don’t ignore or skip tests if you can help it
        • Check the environment
        • Check inputs for non-deterministic values
        • Check timeouts
        • Check system resources
        • Check for race conditions
        • Check if there is any fixed order to the tests
        • Keep your tests maintained.
          • ...more
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          How To Code WellBy Peter Fisher
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