Should consider to add logging. Log messages might include which test outcome have been registered internally and which dependencies have been considered. Most log messages would have DEBUG level, skipping of a test might be logged with level INFO.

The default log level in pytest is WARNING, so all these log messages would be suppressed by default. But for debugging, one could decrease the level to DEBUG and then these messages might be helpful to understand what is going on.

I still need to experiment with logging in pytest, though, in order to check whether this really works as I assume and to assess how useful this might be in the end.