[Proposal] - Add `ExUnit.rerun(list_of_modules)` to support rerunning test module in Livebook

[choon...@gmail.com]

Hi all,

I would like to propose `ExUnit.rerun(list_of_modules)` to rerun test modules.

Use Case
As far as I could think off, it is only useful in the context of Livebook notebook.

Often times, when writing a tutorial in Livebook, I want to write a test case for

the users so they could interactively write some code to make it pass. This is especially

helpful when we use Livebook as a teaching medium.

Currently, there are no ways to support ruruning a test without rewriting it. I have tried using Livebook branch out section but have no luck as well.

Current Hack
Currently, one can still achieve that by using Module.create/3 with ExUnit.run/1. Here's a Livebook notebook to demonstrate it, or you can run it here.

This work since we are essentially defining a "new" module.

Minimal working changes
Here's a gist that I quickly hack on to implement it. It's not perfect but seems to be working.

The Livebook twitter account suggested sending a PR here, but I guess let me propose it here first.

[José Valim]

A pull request will be very welcome indeed!

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