rez-test --src

A feature to be able to give a rez-test the ability to run a test on the source, rather than on an installed package-version. Useful for linters that can change your source files, like `black`.

Start at the rez-test command entry point and trace how tests currently run against an installed package-version. Define the source-testing path and verify that a tool such as black can modify the source files while the test runs.

Written by the indexing model from the issue text.