thema: Add compat checking cases, improve errors #153
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This PR separates out a clear pattern within the
invalidlineagestestdata corpus for checking backwards compatibility invariants on schemas. It accomplishes this through negation - defining a series of schemas that violate a particular rule, and expecting thatBindLineagethrows an error when encountering such a case. This approach is sufficient to establish the rule, because the law of the excluded middle applies in this case - every schema relation is either backwards compatible, xor not, and every syntactic version numbering either adheres to that, xor not.As indicated by several of these cases being in the
ToDolist forTestInvalidLineages, Thema's checkers do not yet catch all of these cases.The error output is also somewhat improved here, though we are not yet doing a reliably good job of providing line-level feedback in the way that we really ought to according to the principles outlined in #44.
Finally, this also fixes a huge 馃う馃徎 - when doing backwards compatibility checking, the parameters being passed to
compat.ThemaCompatible()were reversed, resulting in checking if e.g. 0.0 was backwards compatible with 0.1, rather than vice-versa.cc @joanlopez @mildwonkey