set up RSpec-based test suite and seed with tests

[mojavelinux]

No description provided.

[mojavelinux]

In order for GitHub Actions to run, I think you need to enable it on the repository. If it already is, then I think this PR has to be merged in order for it to initiate the workflow. You can find the result of the workflow in my fork: https://github.com/mojavelinux/open-uri-cached/actions/runs/1629945306

[tigris]

Thanks for this. I've written a few of my own in the meantime as well.

Will see if I can incorporate them all.

[tigris]

Apologies. I attempted to fix merge conflicts, but seems we were doing similar things in slightly different ways 🤣 .

I've pushed out 1.0.0 for now which should work on ruby 3.1.x and we can merge these tests later. Thanks for your efforts today!

[mojavelinux]

I just submitted the tests as an idea to get you started. Feel free to modify them as you see fit. If you need anything else from me, don't hesitate to ask. I'm glad to help.