继承鼻子测试的基类

时间:2014-01-27 22:08:09

标签: python python-2.7 nose

我正在尝试使用nose实现集成测试框架。在核心,我想要一个所有测试类继承的基类。我想要一个被调用的类设置函数以及每个测试设置函数。当我使用nosetests a_file.py -vs时,其中 a_file.py 如下所示:

    from nose import tools

    class BaseClass(object):
        def __init__(self):
            print 'Initialize Base Class'

        def setup(self):
            print "\nBase Setup"

        def teardown(self):
            print "Base Teardown"

        @tools.nottest
        def a_test(self):
            return 'This is a test.'

        @tools.nottest
        def another_test(self):
            return 'This is another test'

    class TestSomeStuff(BaseClass):
        def __init__(self):
            BaseClass.__init__(self)
            print 'Initialize Inherited Class'

        def setup(self):
            BaseClass.setup(self)
            print "Inherited Setup"

        def teardown(self):
            BaseClass.teardown(self)
            print 'Inherited Teardown'

        def test1(self):
            print self.a_test()

        def test2(self):
            print self.another_test()

输出:

Initialize Base Class
Initialize Inherited Class
Initialize Base Class
Initialize Inherited Class
cases.nose.class_super.TestSomeStuff.test1 ... 
Base Setup
Inherited Setup
This is a test.
Base Teardown
Inherited Teardown
ok
cases.nose.class_super.TestSomeStuff.test2 ... 
Base Setup
Inherited Setup
This is another test
Base Teardown
Inherited Teardown
ok

----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK

如何制作__init__setupteardown函数类方法?当我尝试这个时:

from nose import tools

class BaseClass(object):
    def __init__(self):
        print 'Initialize Base Class'

    @classmethod
    def setup_class(self):
        print "\nBase Setup"

    @classmethod
    def teardown_class(self):
        print "Base Teardown"

    @tools.nottest
    def a_test(self):
        return 'This is a test.'

    @tools.nottest
    def another_test(self):
        return 'This is another test'

class TestSomeStuff(BaseClass):
    def __init__(self):
        BaseClass.__init__(self)
        print 'Initialize Inherited Class'

    @classmethod
    def setup_class(self):
        BaseClass.setup_class(self)
        print "Inherited Setup"

    @classmethod
    def teardown_class(self):
        BaseClass.teardown_class(self)
        print 'Inherited Teardown'

    def test1(self):
        print self.a_test()

    def test2(self):
        print self.another_test()

我明白了:

Initialize Base Class
Initialize Inherited Class
Initialize Base Class
Initialize Inherited Class
ERROR

======================================================================
ERROR: test suite for <class 'cases.nose.class_super.TestSomeStuff'>
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/nose/suite.py", line 208, in run
    self.setUp()
  File "/usr/lib/python2.7/dist-packages/nose/suite.py", line 291, in setUp
    self.setupContext(ancestor)
  File "/usr/lib/python2.7/dist-packages/nose/suite.py", line 314, in setupContext
    try_run(context, names)
  File "/usr/lib/python2.7/dist-packages/nose/util.py", line 478, in try_run
    return func()
  File "/home/ryan/project/python_testbed/cases/nose/class_super.py", line 30, in setup_class
    BaseClass.setup_class(self)
TypeError: setup_class() takes exactly 1 argument (2 given)

----------------------------------------------------------------------
Ran 0 tests in 0.001s

FAILED (errors=1)

从超类调用中删除selfBaseClass.setup_class(self) - &gt; BaseClass.setup_class())似乎解决了这个问题...我不明白:

Initialize Base Class
Initialize Inherited Class
Initialize Base Class
Initialize Inherited Class

Base Setup
Inherited Setup
cases.nose.class_super.TestSomeStuff.test1 ... This is a test.
ok
cases.nose.class_super.TestSomeStuff.test2 ... This is another test
ok
Base Teardown
Inherited Teardown

----------------------------------------------------------------------
Ran 2 tests in 0.001s

OK

但是,这对__init__函数没有帮助。我怎样才能使这个类方法?为什么将self传递给超类会失败?

有没有人对此有一些信息?

2 个答案:

答案 0 :(得分:2)

类方法采用单个隐式参数(按惯例称为cls,尽管您也称它为self),例如实例方法采用self

致电时

BaseClass.setup_class(self)

这更像是

BaseClass.setup_class(BaseClass, self)

因此警告两个论点。因此,当你放弃self时它就被修复了;提醒一下,更改定义:

@classmethod
def setup_class(cls):

哦,__init__没有任何意义@classmethod;它用于设置实例。

答案 1 :(得分:1)

看起来@Jonrsharpe已经击败了我,但是,是的。无论如何,我会发布它。

This one可能会解释setup_class()错误。当你包含self时,它传递的是BaseClass的实例以及'self'(或TestSomeStuff)。鼻子必须硬编码,以便在该功能中不允许超过1个参数(或单元测试,不确定哪个具有该要求)。

对于 init 部分,在阅读了Unittest文档后,似乎代码将更好地打印为:

def __init__(self):
        print 'Initialize Base Class Object'

def __init__(self):
    BaseClass.__init__(self)
    print 'Initialize Inherited Class Object'

因为它基本上为每个测试用例创建一个对象并运行 init 函数以确保测试用例准备就绪。