Orphan check file

Orphaned by the override check reversion that deleted the test source.

2524fdde3edc7b668fdb4bf68e990141d3ec18d6

I guess it would be more useful to write a script to sanity check the myriad files.

Or a kind of reverse-test-coverage, to check that all test resources were applied during a build.

For posterity: the answer was "3".