How do we unit test tasks and flows in Prefect 2.0? I am getting the following error on my test cases after upgrading.

Tasks cannot be run outside of a flow. To call the underlying task function outside of a flow use

task.fn()

I tried

with prefect_test_harness():

but no luck... Ah. Never mind, I should have been reading the error more. Calling

fn

instead of

run

fixes old test cases.

there are some great examples that live in our numerous collections repos, like this one

check out https://discourse.prefect.io/t/unit-testing-best-practices-for-prefect-flows-subflows-and-tasks/1070