为什么我的鼻子测试在使用继承时以 A、AB、ABC 方式重复测试

Question

所以我的 nosetests 项目有问题，所以我隔离了这个问题并试图解决它，但我留下了一些奇怪的行为。请参阅下面我的脚本以供参考。

from unittest import TestCase

class BaseClass(TestCase):

    @classmethod
    def setup_class(cls):
        print("defining base class stuff")

    def assert_something(self, expected, actual):
        assert expected == actual, "failed test"


class FirstClass(BaseClass):

    @classmethod
    def setup_class(cls):
        super(FirstClass, cls).setup_class()
        print("defining first class stuff")


    def test_first_class(self):
        self.assert_something(1, 1)


class SecondClass(FirstClass):

    @classmethod
    def setup_class(cls):
        super(SecondClass, cls).setup_class()
        print("defining second class stuff")


    def test_second_class(self):
        self.assert_something(5, 4)


class ThirdClass(SecondClass):

    @classmethod
    def setup_class(cls):
        SecondClass.setup_class()
        print("defining third class stuff")


    def test_third_class(self):
        self.assert_something(13, 13)

现在如果我运行上面的脚本。我在终端中得到以下输出：

(sandbox_venv) michael@Puter:~/workspace/sandbox$ nosetests -v
test_first_class (test_.FirstClass) ... ok
test_first_class (test_.SecondClass) ... ok
test_second_class (test_.SecondClass) ... FAIL
test_first_class (test_.TestThirdClass) ... ok
test_second_class (test_.TestThirdClass) ... FAIL
test_third_class (test_.TestThirdClass) ... ok

由于我的继承方式。很明显，他们也在继承测试用例并再次运行ning 它们。这就是我标题中'A, AB, ABC'的意思。

这不是所需的功能。我试图制作这个项目，以便我可以运行按特定顺序进行测试，但我也可以使每个测试彼此独立。这样，如果我只进行运行 ThirdClass 测试，那么它将运行每个后续 class 中的 setup_class() 而不是测试。

Answer 1

@Ulrich Eckhardt 感谢您的评论。从那以后，我进一步研究了这一点，发现无法使用继承获得所需的功能。

相反，我删除了继承，而只是从每个类设置方法中调用 base_class 中的 setup_class 方法。像这样：

from unittest import TestCase

class BaseClass(TestCase):

    @classmethod
    def setup_class(cls):
        print("defining base class stuff")

    @classmethod
    def assert_something(cls, expected, actual):
        assert expected == actual, "failed test"


class FirstClass():

    @classmethod
    def setup_class(cls):
        BaseClass.setup_class()
        print("defining first class stuff")


    def test_first_class(self):
        BaseClass.assert_something(1, 1)


class SecondClass():

    @classmethod
    def setup_class(cls):
        BaseClass.setup_class()
        print("defining second class stuff")


    def test_second_class(self):
        BaseClass.assert_something(5, 4)


class ThirdClass():

    @classmethod
    def setup_class(cls):
        BaseClass.setup_class()
        print("defining third class stuff")


    def test_third_class(self):
        BaseClass.assert_something(13, 13)

为什么我的鼻子测试在使用继承时以 A、AB、ABC 方式重复测试

Why do my nosetests repeat tests in an A, AB, ABC fashion when using inheritance

inheritance

unit-testing

nose

python-2.7