`loadExposureSeq` is useful function and it may be used in examples. I don't see any reason to not include this function into photo module API. It this case such integrations with test infra is really ugly way because I need a several alternatives of the same code.
I can simplify `getDataPath()` method, and remove this buggy `fopen` check (because neither name or smth else don't restrict me to use **directory** path here).