Test Coverage

[mpchadwick]

I think it would be a good idea to start adding some test coverage for this codebase. It helps to more confidently make decisions in scenarios like this (or just in general when adding new code):

#44 (comment)

phpunit is pretty much the de facto choice for test coverage in PHP, so I'd propose we use that here. Thoughts?

[proclnas]

Test coverage plus an integration with Codecov for example adds even more maturity to code

[cfreal]

Closing for now.