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I've been looking at the nice `prefect_test_harness` in 2.0 and am wondering if any such fixtures exist for 1.2? Are there any general guides for setting up tests for projects using prefect?

No to fixtures, but have you seen <https://docs.prefect.io/core/idioms/testing-flows.html#testing-flow-composition|this> page?

Yup, but I need to test flow-of-flows composition from a utility and believe I require mocked registration to do so

Ah yeah that is hard because it’s an API call to start the flow run

Maybe the tests <https://github.com/PrefectHQ/prefect/blob/40e2e2bd1c1de5651bc7fb484c823e43cfc69877/tests/tasks/prefect/test_flow_run.py|here> for the `create_flow_run` task might help??