带有基类和子类的 Python 单元测试 [英] Python unit test with base and sub class

问题描述

我目前有几个单元测试，它们共享一组通用的测试.举个例子:

I currently have a few unit tests which share a common set of tests. Here's an example:

import unittest

class BaseTest(unittest.TestCase):

    def testCommon(self):
        print 'Calling BaseTest:testCommon'
        value = 5
        self.assertEquals(value, 5)

class SubTest1(BaseTest):

    def testSub1(self):
        print 'Calling SubTest1:testSub1'
        sub = 3
        self.assertEquals(sub, 3)


class SubTest2(BaseTest):

    def testSub2(self):
        print 'Calling SubTest2:testSub2'
        sub = 4
        self.assertEquals(sub, 4)

if __name__ == '__main__':
    unittest.main()

上面的输出是:

Calling BaseTest:testCommon
.Calling BaseTest:testCommon
.Calling SubTest1:testSub1
.Calling BaseTest:testCommon
.Calling SubTest2:testSub2
.
----------------------------------------------------------------------
Ran 5 tests in 0.000s

OK

有没有办法重写上面的代码，这样第一个 testCommon 就不会被调用?

Is there a way to rewrite the above so that the very first testCommon is not called?

我希望它只运行 4 个测试，而不是运行 5 个测试，其中 2 个来自 SubTest1，另外 2 个来自 SubTest2.似乎 Python unittest 正在自行运行原始 BaseTest，我需要一种机制来防止这种情况发生.

Instead of running 5 tests above, I want it to run only 4 tests, 2 from the SubTest1 and another 2 from SubTest2. It seems that Python unittest is running the original BaseTest on its own and I need a mechanism to prevent that from happening.

推荐答案

使用多重继承，这样你的具有通用测试的类本身不会从 TestCase 继承.

Use multiple inheritance, so your class with common tests doesn't itself inherit from TestCase.

import unittest

class CommonTests(object):
    def testCommon(self):
        print 'Calling BaseTest:testCommon'
        value = 5
        self.assertEquals(value, 5)

class SubTest1(unittest.TestCase, CommonTests):

    def testSub1(self):
        print 'Calling SubTest1:testSub1'
        sub = 3
        self.assertEquals(sub, 3)


class SubTest2(unittest.TestCase, CommonTests):

    def testSub2(self):
        print 'Calling SubTest2:testSub2'
        sub = 4
        self.assertEquals(sub, 4)

if __name__ == '__main__':
    unittest.main()

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