单位测试__init_subclass__ in Python 3.x
我正在尝试单元测试其基类实施__init_subclass __方法的继承类。代码如下：
quick_test.py
import unittest
from unittest.mock import create_autospec
class Parent():
PROPERTY = NotImplemented
def __init_subclass__(cls, **kwargs):
if cls.PROPERTY is NotImplemented:
raise NotImplementedError("Please implement the `PROPERTY`.")
super().__init_subclass__(**kwargs)
def __init__(self, connection_type="default"):
self.connection_type = connection_type
class Child(Parent):
PROPERTY = "has value"
class ChildNoProp(Parent):
pass
class TestClass(unittest.TestCase):
def test_required_params(self):
mock = create_autospec(Child)
self.assertRaises(NotImplementedError, mock)
if __name__ == '__main__':
unittest.main()
问题是我什至无法达到测试案例，因为child> childnoprop定义呼叫__ initi> __ init_subclass __ __ < /代码>在基类中，并提出例外。
有什么方法可以通过当前实现来对此进行单位测试，或者我应该在__ init_subclass __中废除升级错误？
I am trying to unit test an inherited class for which its base class implements __init_subclass__ method. Code is the following:
quick_test.py
import unittest
from unittest.mock import create_autospec
class Parent():
PROPERTY = NotImplemented
def __init_subclass__(cls, **kwargs):
if cls.PROPERTY is NotImplemented:
raise NotImplementedError("Please implement the `PROPERTY`.")
super().__init_subclass__(**kwargs)
def __init__(self, connection_type="default"):
self.connection_type = connection_type
class Child(Parent):
PROPERTY = "has value"
class ChildNoProp(Parent):
pass
class TestClass(unittest.TestCase):
def test_required_params(self):
mock = create_autospec(Child)
self.assertRaises(NotImplementedError, mock)
if __name__ == '__main__':
unittest.main()
The problem is I can't even reach the test case because ChildNoProp definition calls __init_subclass__ in base class and raises exception.
Is there a way I can unit test this with current implementation, or should I scrap the error raising in __init_subclass__?
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您可以在
assertraises块中创建类。如果方法内部的
类声明使您感到不舒服，则可以直接使用type构造函数。You can create the class inside the
assertRaisesblock.If the
classdeclaration inside of a method makes you uncomfortable, you can use thetypeconstructor directly.