[英]Python patch: calling nested method in class doesn't work
這是我的以下模板代碼:
import mock
import unittest
class ClassToPatch(object):
def __init__(self, *args):
pass
def some_func(self):
data = self._get_data()
return data
def _get_data(self):
return 'class_data'
class TestCase(unittest.TestCase):
@mock.patch('__main__.ClassToPatch', autospec = True)
def test_1(self, mock1):
#mock1.data = "mocked data"
m = mock.Mock()
m._get_data.return_value = 'mocked data'
mock1.return_value = m
u = ClassToPatch()
self.assertEqual(u.some_func(), 'mocked data')
unittest.main()
但是,這會在斷言上引發錯誤。 當我將其更改為:
self.assertEqual(u._get_data(), 'mocked data')
它工作正常。 有人可以告訴我我在做什么錯嗎?
為了測試,僅修補_get_data
,而不修補整個類。
@mock.patch.object(ClassToPatch, '_get_data')
def test_1(self, mock):
mock.return_value = 'mocked data'
u = ClassToPatch()
self.assertEqual(u.some_func(), 'mocked data')
要么
@mock.patch.object(ClassToPatch, '_get_data', lambda self: 'mocked data')
def test_1(self):
u = ClassToPatch()
self.assertEqual(u.some_func(), 'mocked data')
要么
@mock.patch('__main__.ClassToPatch._get_data', return_value='mocked data')
def test_1(self, mock1):
u = ClassToPatch()
self.assertEqual(u.some_func(), 'mocked data')
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