It appears that parametrized pytest tests aren't properly supported in approval. Rather than treating each invocation of the parametrized test separately, approval treats them identically, i.e. it looks for the "golden" output in the same file for each parametrization.

Pytest itself allows each parametrization to pass or fail independently, so I had hoped approval would as well.

My current motivation for this is that I have a small compiler, and I want to use approval for verifying compilation results for a corpus of inputs. I'd like to just have a directory where I can drop new inputs and have them automatically picked up by my tests without needing to write a new test method, and parametrization seems like the way to go here.