python patch test, specific import

I have this code:

from src.fetchFunction.feed_data.factories import getPlatform

class VideoService:

    def something(self):
        pl = getPlatform()

now I want to mock the getPlatform in my test:

import unittest
from unittest.mock import patch
from unittest.mock import MagicMock

class FieldsDeciderTest(unittest.TestCase):

    @patch('src.fetchFunction.feed_data.factories')
    def test_get_single(self, factoriesMock):
        factories.getPlatform = MagicMock(return_value={})

But this doesn't work properly, any idea how it should be done?

Thanks