[Python] How to patch global class in python correctly

My project structure- project/

│ ├── core/ │

└── service/ │

└── file.py │
| └── tests/
└── test_file.py


I have a function fun that uses a class method

file.py-

from another_module import myClass
cls_instance=myClass()

def fun():
return cls_instance.request()


And I want to test the fun with patch , like ->

test_file.py-

from core.service.file import fun
class TestCase(unittest.TestCase):
@patch("core.service.file.cls_instance")
def setUp(self, mock):
self.mock = mock.return_value


def test_fun(self):
self.mock.request.return_value = 1
resp=fun()
self.assertEqual(resp, 1)


Test Failed with -
Expected : None

Actual :1

What am I doing wrong here?

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