Fix some unit tests

[seananderson]

Suppress some warnings. Make sure tests aren't missing an expectation. Make sure packages loaded. Needed for coverage checks (although there might be other issues too).

[James-Thorson-NOAA]

Thanks Sean!

After thinking a bit, I'm gonna instead do a PR from your branch into my current branch add_header, resolve the conflicts by prioritizing your versions in those files that you changed, and see if that still passes checks. Feel free to tell me if you see a better way to do this, I'm still learning about how best to use github collaboratively with multiple developers.

[James-Thorson-NOAA]

I merged this to add_header which is my current dev branch. I'm trying to sort the stream-network example, which is causing the pkgdown to fail on Actions, although it runs locally. Anyway, I'm gonna close this for now, but the changes will go to main when I merge add_header