Difference between running with testbook(execute=True) and converting to python and running with nbconvert?

[dyollb]

I am having trouble using testbook.

I am running some functions, which require that a context is setup in the same thread (and process).
I have a pytest fixture (scope="session", autouse=True) to initialize the context.

• When I run the notebook using testbook it looks like the context is not setup.
• If I run the same notebook (by converting it to Python code using nbconvert.PythonExporter) using runpy, it works as expected

Am I missing some configuration or execution policy option? Or is my fixture injected in the wrong order?