在课程中模拟方法

Question

我在线阅读了很多关于嘲笑整个课程的信息。但是，我有一个有多种方法的课程;例如：

class A():
    def methoda(param1, param2):
        do things
        return thing
    def methodb(param3):
        do things (including something calling methoda)

如何在测试文件中模拟methoda以返回所需的值，以便我可以测试methodb？我不想嘲笑整个班级。

我尝试过做的事情：

from mock import patch, mock, MagicMock
from sourceA.models import ClassName
from django.test import TestCase

class ClassTest(TestCase):

    @patch('sourceA.models.ClassName.methodA')
    def test_method(self, mock_method_return):
        mock_method_return.return_value = 10
        instance = ClassName()
        instance.methodB #METHOD B CALLS METHOD A; I want method A to return 10
        print "OUTPUT", instance.FIELDA #Debug Tool - Field A is modified by Method B, based on the return value of method A
    assert instance.FIELDA == 10 

我也试过这个：

class ClassTest(TestCase):

    @patch('sourceA.models.ClassName.methodA', return_value=10)
    def test_method(self, mock_method_return):
        instance = Mock(spec=ClassName())
        instance.methodB #METHOD B CALLS METHOD A; I want method A to return 10
------ OR instance methodB = MagicMock(return_value=10) and then instance.MethodB
        print "OUTPUT", instance.FIELDA #Debug Tool - Field A is modified by Method B, based on the return value of method A
    self.assertEqual(instance.FIELDA, 10)

我不确定我还应该尝试什么/我做错了什么。