Nothing special or too sophisticated. On the one hand I use Just (a command runner) to standardize specific build and test commands that call cargo with various flags. Here is a simple example from one of my repos: https://github.com/deepmesa/deepmesa-rs/blob/mainline/justfi...

Then I have a bunch of elisp code that calls just and / or generates boilerplate code right in the buffer - M-x new-macro or M-x run-test (asks for a test to run) etc. I keep writing more elisp as I go along and add specific key bindings to specific things and now its too hard to move away from it all.