I just figured out a confusion I had where I was trying to get the stdout of a .withExec(), but the command was actually outputting to stderr instead of stdout. The command bun test --coverage is exiting with 0 so perhaps this isn't properly semantic, but I was wondering if there's a way to display both streams in the terminal when running a module function that returns a container.
Alternately, I could see capturing the output inside the module as a string and then returning that as the result of a different function when I need it -- this is probably the more correct solution here.