我正在尝试找出在测试中使用 autospec 的最佳方法。在以下场景中,我使用 autospec 来检测何时使用太多参数进行调用。使用 调用时,此方案按预期工作$ python filename.py
。
import unittest
import mock
class FakeDependency(object):
def set_obj(arg1, arg2):
self.foo = arg1
self.bar = arg2
class FakeObject(object):
def __init__(self):
self.fake_dependency = FakeDependency()
def set_dependency(self):
self.fake_dependency.set_obj('foo', 'bar', 'buz') # Bug
class TestFakeObject(unittest.TestCase):
@mock.patch.object(FakeDependency, 'set_obj')
def test_set_dependency_with_assert_called(self, mock_dependency):
r = FakeObject()
r.set_dependency()
mock_dependency.assert_called_once_with('foo', 'bar', 'buz') # Test passes does not catch bug
@mock.patch.object(FakeDependency, 'set_obj', autospec=True)
def test_set_dependency_with_autospec(self, mock_dependency):
r = FakeObject()
r.set_dependency() # Test Fails
if __name__ == '__main__':
unittest.main()
但是,如果我更改测试用例以检测何时调用的参数太少,那么它会通过并且不会捕获错误。
class FakeDependency(object):
def set_obj(arg1, arg2, arg3):
self.foo = arg1
self.bar = arg2
self.buz = arg3
class FakeObject(object):
def __init__(self):
self.fake_dependency = FakeDependency()
def set_dependency(self):
self.fake_dependency.set_obj('foo', 'bar') # Bug
class TestFakeObject(unittest.TestCase):
@mock.patch.object(FakeDependency, 'set_obj')
def test_set_dependency_with_assert_called(self, mock_dependency):
r = FakeObject()
r.set_dependency()
mock_dependency.assert_called_once_with('foo', 'bar') # Test passes does not catch bug
@mock.patch.object(FakeDependency, 'set_obj', autospec=True)
def test_set_dependency_with_autospec(self, mock_dependency):
r = FakeObject()
r.set_dependency() # Test Also passes
所以我的问题是做错了什么?根据文档autospec 也应该在传递的参数太少时取消技术。