使用 python unittest 抽象测试用例 [英] abstract test case using python unittest

问题描述

是否可以创建一个抽象的TestCase，它会有一些test_* 方法，但是这个TestCase 不会被调用，这些方法只会在子类?我想我将在我的测试套件中有一个抽象的 TestCase 并且它将为单个接口的几个不同实现进行子类化.这就是为什么所有的测试方法都是一些，只有一个，内部方法的变化.我怎样才能以优雅的方式做到这一点?

Is it possible to create an abstract TestCase, that will have some test_* methods, but this TestCase won't be called and those methods will only be used in subclasses? I think I am going to have one abstract TestCase in my test suite and it will be subclassed for a few different implementation of a single interface. This is why all test methods are the some, only one, internal method changes. How can I do it in elegant way?

推荐答案

我不太明白你打算做什么 --经验法则是不要对测试聪明"-把它们放在那里，简单地写下来.

I didn't quite understand what do you plan to do -- the rule of thumb is "not to be smart with tests" - just have them there, plain written.

但是为了实现你想要的，如果你从 unittest.TestCase 继承，每当你调用 unittest.main() 你的抽象"类将被执行 - 我认为这是你想要避免的情况.

But to achieve what you want, if you inherit from unittest.TestCase, whenever you call unittest.main() your "abstract" class will be executed - I think this is the situation you want to avoid.

只需这样做:创建从对象"而不是从 TestCase 继承的抽象"类.对于实际的具体"实现，只需使用多重继承:从 unittest.TestCase 和抽象类继承.

Just do this: Create your "abstract" class inheriting from "object", not from TestCase. And for the actual "concrete" implementations, just use multiple inheritance: inherit from both unittest.TestCase and from your abstract class.

import unittest

class Abstract(object):
    def test_a(self):
        print "Running for class", self.__class__

class Test(Abstract, unittest.TestCase):
    pass

unittest.main()

update:先颠倒继承顺序 - Abstract 以便其定义不会被 TestCase 默认值覆盖，并在注释中指出如下.

update: reversed the inheritance order - Abstract first so that its defintions are not overriden by TestCase defaults, as well pointed in the comments bellow.

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