Include table tests for operations and end-to-end.

Because this package's original fuzz test is neither comprehensive nor
trustworthy (this was a limitation acknowledged at its time of
creation due to an imprudent assessment that iteration speed versus
time spent on quality/deliberateness is desirable), a set of targeted
tabular tests have been created, which enable us to carefully exercise
individual behaviors without nasty imperative test scaffolding and
other shenanigans, which should have been avoided in the first place.

Mea culpa.