arc-unit-mocha is a tool that we use to make arcanist run and analyze test reports. It works by running npm run test-report under the hood and then inspecting the resulting .xunit file.

The issue with that setup is that sometimes tests fail during arc diff, but no output is shown to the user, leaving them guessing what the error is or having to re-run tests, which can be time consuming.

This task is about changing the code in that repo so that when using it as a plugin, arcanist will show the test command output to the stdin, or save it to a file and display the file's location