Yes, the tests work using pio test and I’ve got them working in Github Actions too.
Bear in mind I’m not an expert in C++ but I believe all my dependencies are clean and I don’t (directly or indirectly) reference hardware related code from my unit tests.
My first thought is to wonder how the build task I’ve set up knows not to build the src folder. Do I need a special build task?
I saw this thread but I’ve tried looking at articles linked from the solution.