I’m looking into how I can test a flow with mocked functions. This is because some of the functions will have API calls that I want to control the responses to for testing. I believe the recommended approach is to use subprocess but that doesn’t seem to be able to use any of the mocked values I establish before I call it. Any recommendations? Thank you!

take a look at this article that highlights a few patterns do you want to mock artifact values, parameters, or something else?

I want to mock a call that is made to an API in a step. for example:

@step
def get_data_from_api(self):
  # this API call I'd like to be mocked so I can control the response
  results = make_api_call()
  self.next(self.end)

are you using a library/framework for mocking or doing it manually?

I’m currently just testing and using

unittest.mock.patch

to explore using Metaflow. The library I use in our code is a combonation of

VCR

and

unittest.mock.patch

sure!

@straight-shampoo-11124 https://gitlab.com/-/snippets/2551300

sorry for the slow response here! this makes sense 🙂 Are you ok going with this approach for mocking for now?

yup 😄 — happy to use some custom code for now

you mean a programmatic API for running Metaflow commands? It's definitely something we want to do. Have you seen this memo on the topic?

I’ve seen it before, but looking through it again now with current context 😄