Python mock patch local function

Question

I want to check if a local function (declared on the test itself) is called.

For example:

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

    def test_this(user, room, content, data):
        pass

    handlers = {action: test_this}

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

            f.assert_called_with()

How can I mock path the function test_this inside my test?

With .test_this I got the error:

E       ValueError: Empty module name

Anson Miu · Accepted Answer · 2021-04-07 21:24:59Z

2

If test_this is a mocked function, you can define test_this as a Mock object and define assertions upon it:

from unittest import mock

def test_handle_action():
    # GIVEN
    action = "test"
    user = "uid"
    room = "room"
    content = "test"
    data = {}

    test_this = mock.Mock()

    handlers = {action: test_this}

    with mock.patch("handlers.handlers", handlers):
        # WHEN
        handle_action(action, user, room, content, data)

        # THEN
        test_this.assert_called_with(user, room, content, data)

answered Apr 7, 2021 at 21:24

Anson Miu

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1 Comment

Rodrigo Over a year ago

Perfect. Thank you!

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