invent a way to flag which tests are definitely working and therefore should cause actual failures in testing instead of being marked 'skipped'

[ericblade]

.... due to inheriting a large number of failing test cases that are worth preserving to try to solve the reader errors on them in the future, the test suite will currently pass all failed reader tests by marking them as ignore. There are a bunch that do pass, and those should always pass forever and ever, otherwise we've broken something. SO, we need to invent a method in the test suite that allows flagging of which reader tests should NOT fail, so that if any of the ones that currently do pass STOP passing, then we will be alerted immediately.