Elixir Streams |> 🔍 ExUnit 1.17's new flag to find intermittent failures
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Elixir Streams |> 🔍 ExUnit 1.17's new flag to find intermittent failures

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    <h3>
      🔍 ExUnit 1.17&#39;s new flag to find intermittent failures
    </h3>
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      <h4>
        Notes
      </h4>
      <p>
        Intermittent tests are a pain, but Elixir 1.17 has a really cool new

flag in mix test .

Whenever we have a test that fails intermittently, we can run a set of tests N times until the test fails: 


mix test test/path/to/failing/test.exs --repeat-until-failure 100

Once a test fails, you can grab the seed and run the failing test with that seed: 


mix test test/path/to/failing/test.exs --seed 123456

If you’re curious as to how --seed affects our tests, take a look at ExUnit’s –seed surprising behavior