Pytest mock patch function not called

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I am sure that a function is called (because of a print statement on it).

My test target is the function handle_action.

__init__.py

from .dummy import HANDLE_NOTHING, handle_nothing

handlers = {
    HANDLE_NOTHING: handle_nothing,
}


def handle_action(action, user, room, content, data):
    func = handlers.get(action)

    if func:
        func(user, room, content, data)

Unit test

import mock

from handlers import HANDLE_NOTHING, handle_action


def test_handle_dummy_action():
    action = HANDLE_NOTHING
    user = "uid"
    room = "room"
    content = "test"
    data = {}

    with mock.patch("handlers.dummy.handle_nothing") as f:
        handle_action(action, user, room, content, data)

        f.assert_called_with()

When I run I get:

E           AssertionError: expected call not found.
E           Expected: handle_nothing()
E           Actual: not called.

If I change from handlers.dummy.handle_nothing to handlers.handle_nothing I receive the same error.

python-mock pytest python
1 Answers

The problem is that you are too late to patch, the name was already resolved at import time when the handlers dict was created, i.e. when the code was imported:

handlers = {
    HANDLE_NOTHING: handle_nothing,  # <-- name lookup of "handle_nothing" happens now!
}

By the time handle_action is called in your test, it doesn't matter if the name handle_nothing name has been patched with something else, because that name is not actually used by handle_action at all.

Instead, you will need to patch the value in the handlers dict directly.

user_6740390
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