@Marvin whats the best way to setup tests for a task?

The best way to set up tests for a task in Prefect involves using the

.fn

attribute of the task and the

prefect_test_harness

for unit tests. Here’s a brief guide: 1. Unit Testing a Task: - You access the original function of the task using

.fn

. - Disable logging if your task uses a logger to avoid

RuntimeError

from a missing flow context.

python
from prefect import task
from prefect.logging import disable_run_logger

@task
def my_favorite_task():
    return 42

def test_my_favorite_task():
    with disable_run_logger():
        assert my_favorite_task.fn() == 42

2. Unit Testing a Flow: - Use

prefect_test_harness

to run flows against a temporary local SQLite database.

python
from prefect import flow
from prefect.testing.utilities import prefect_test_harness

@flow
def my_favorite_flow():
    return 42

def test_my_favorite_flow():
    with prefect_test_harness():
        assert my_favorite_flow() == 42

3. Extensive Testing using

pytest

: - Leverage

prefect_test_harness

as a fixture in your unit testing framework like

pytest

. For more details, refer to the Prefect documentation on testing: Testing in Prefect For code examples, you can check out: Prefect Code Examples on GitHub This should help you get started with setting up and executing tests for your Prefect tasks and flows.