pointer to guidelines or requirements for tests

[homberghp]

The pull request that could potentially provide canon CR3 decoding (R5,R6, M50, 250D, 90D to name a few young cameras)
is help up by what appears to be failing test coverage. Could someone point out the requirements for the test, and the way they integrate into the tests in general so that we get this boat floating again.

I might be able to provide a helping hand and are certainly interested in the result, both for the camera types and the testing technology.

Thanks.