[Proposal] A 'concise' flag for 'mix test'

[sp]

Hello!

While working through a project I found that I just wanted a print out of tests that failed and on what line instead of the full description and stack trace. Something like:

test/my_test.exs:5

test/my_test.exs:12

.... etc

I was able to 'grep' something close to this but feel it would be helpful to pass an option to 'mix test' allowing for a concise output.

I've got something close with the Elixir source code, I've changed the CLI formatter behavior when the option is present, but wanted to make sure others would approve before opening a PR.

Please let me know your thoughts!

[José Valim]

Hi!

ExUnit supports custom formatters, so my suggestion is to implement your own formatter and plug it in, without a need to change Elixir. :)

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[sp]

Hi José! Thank you for the reply!

I thought about that, but couldn't see a way to change the formatter based on a custom flag for 'mix test'...?

Ideally, I'd love to be able to run 'mix test --concise' so I can change the formatter on the fly.

[José Valim]

IIRC "mix test --formatter MyFormatter" should do it.

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[sp]

Ah, that's much simpler!

Thank you for the help!