Sb 1337/Start test implementation

[cardenaso11]

Tests should be fine but there's a bit of stuff related to Elaine's nix/macos environment for Aiken development that should be removed before merge

[Quantumplation]

Please revert this change, and make it it's own standalone PR with a test;

Each finding should be alone in it's own PR, whereas this PR is just for broader testing of the whole protocol.

Also, no need to make reference to the finding in the comment; just explain why we're doing what we're doing.

[Quantumplation]

I think this is now in a good state to merge, and we can continue to refine it in follow ups.

Some things I'd like to see:

• pull some of the data-setup stuff into lib/tests; the idea is to provide different example functions for different types of sample test data, so that the tests themselves can be pretty minimal and readable. as it is right now, i have very little idea what these are testing, because the code is so complex.
• Tests for each feature, at a minimum
• Negative tests, that confirm that you can't do something
• some kind of structure to how we organize the tests, so we can correlate it to the test cases spreadsheet we've been putting together (or, if you have an alternative proposal, open to that)