@Marvin is it possible to mock a block using prefect_test_harness

To determine how to mock a block using

prefect_test_harness

, let's first check the specific Prefect version you might be using as the details could vary between versions. I'll look into the relevant documentation and resources for both Prefect 2.x and 3.x. One moment, please. It looks like the concept of mocking a block using the

prefect_test_harness

isn't explicitly detailed in the Prefect 2.x or 3.x documentation based on the information I found. However, I discovered some relevant insights on testing flows and tasks which could indirectly help you. For Prefect 2.x,

prefect_test_harness

is mentioned as a context manager or fixture that allows you to run flows and tasks against a temporary local SQLite database. This helps in isolating test runs to ensure they don't interfere with your main database. You may integrate this into your unit tests, perhaps by simulating or mocking the behavior of blocks within this test framework. Here's the relevant page for more insights: Prefect 2.x Testing Guide. Prefect 3.x documentation references block extensions through integration libraries and suggests registration of blocks. Details about unit testing practices were mentioned more in the context of Pull Requests and development contributions. But again, explicit instructions on mocking blocks weren't provided in the document snippets. For more on block development, you can visit the Prefect 3.x documentation: Prefect 3.x Blocks. In essence, while direct instructions for mocking blocks specifically with

prefect_test_harness

aren’t outlined, incorporating suitable test harness and mocking techniques within your testing environment could help simulate desired behaviors. Why not channel your inner developer and explore creating some mocks directly? If you need further assistance or want to explore this topic, consider diving deeper into testing libraries such as

unittest

or

pytest

for Python, which can facilitate mocking behavior.