Cannot Capture/Ignore Errors in ExUnit test inside Livebook.

[BrooklinJazz]

I'd like to run tests inside of Livebook, and ignore errors and warnings because they clutter the test output. (I specifically catch errors and format the output or provide helpful hints in my use case)

It seems like logs are printed to the Livebook display regardless of if I capture them or not inside an ExUnit test.

Unlike how ExUnit would run inside a mix project.

Is there a way I can disable warnings and errors that occur during the test?

[josevalim]

I don't think we can tackle this one. capture_log in Elixir captures the console log but Livebook doesn't use the console log at all. :(

[BrooklinJazz]

Fair enough!

If you don't mind my curiosity, how is livebook displaying the error messages? Maybe there's something other than capture_log I can use to disable these error messages.

Feel free to close this discussion if there's nothing we can do on the Livebook end.

[josevalim]

We would need something like Kino.discard_log or Kino.capture_log but I am afraid that's too Kino specific. Specially for your purposes, which is teaching, because we wouldn't teach them the "real thing"?

[BrooklinJazz]

For my purposes, this is running under the hood to provide test feedback for the students. They don't see these tests, so that could actually be great. 🤔