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Yeah. I also fought with this initially when I learned patching and mocking and know how frustrating it is as you seem to be doing everything right, but it does not work. I sympathise with you!

This is actually how mocking of imported stuff works, and once you realise it, it actually makes sense.

The problem is that import works in the way that it makes the imported module available in the context of where your import is.

Lets' assume your code.py module is in 'my_package' folder. Your code is available then as my_package.code. And once you use from dag_common.connections import get_conn in code module - the imported get_conn becomes available as .... my_package.code.get_conn

And in this case you need to patch my_package.code.get_conn not the original package you imported get_conn from.

Once you realise this, patching becomes much easier.