Research Pyodide testing framework

[TheCarton]

I have no previous experience with Pyodide, but there is a default testing suite in their documentation: https://pyodide.org/en/stable/development/testing.html

[thadk]

Thanks all: I think using regular PyTest run with Github Actions on PR's might be okay too for the engine unit testing. For integration testing we'll probably need to run tests in a javascript testing framework with Pyodide.

[mciethan]

Removing the rules-engine tag. The rules engine has set up its unit testing framework (#59 ) and it sounds like integration testing will be handled in javascript.