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Another question, how can I spin up a prefect server just to run unit-tests? Is there any fixture that does this for me?

For this one, not really. You’d really need to spin up and change the backend with `prefect backend server` to run the unit tests

But you can unit test a bunch of things without the server. The hard ones are the ones with API calls like the `StartFlowRun` task.

`StartFlowRun` get the client from the context?

atm I’m using the client.register and client.create_flow_run to manage flows. Why should I use `StartFlowRun`?

Yes it <https://github.com/PrefectHQ/prefect/blob/ca19b43947eb16e36fe9ea777e4e65c15baaf0b8/src/prefect/tasks/prefect/flow_run.py#L403-L404|does> . You don’t need to. I’m just saying that’s an example of a task that really requires a server to test, But you can test a bunch of other things without a Server up