Great work and attitude, thanks a lot for this! :)

Would you have time to make a PR to also add the tests to
<https://github.com/srfi-explorations/srfi-test>? That repo uses SRFI 64
syntax to write the tests. It's almost identical to the (chibi test)
syntax but (test ...) is called (test-equal ...)

Since the SRFI 159 tests are from Chibi and/or the SRFI, I assume they
are MIT licensed.