mock.patch 検証2

fuga.py

import hoge
from hoge import A


def print_value():
    instance = A()
    print(instance.value)


def print_value2():
    instance = hoge.A()
    print(instance.value)

hoge.py

class A:
    value = 10

stdout

10
100

test.py

from unittest import mock

import fuga


class B:
    value = 100


def test():
    with mock.patch('hoge.A', B):
        fuga.print_value()
        fuga.print_value2()


test()