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I don't know that this actually solves #4, but I wanted to try learning property tests and this is what I ended up with.
Overall, I liked it. I can run the tests with rebar3:
it accepts a
--cover
flag to collect coverage data. Running PropEr tests and understanding failures is pretty easy.The part I found difficult was generating tests that were not trivial and didn't involve re-inventing the iso8601 library in the test code. I'm not sure how well I did there.