我正在对数据库运行一些集成测试,我希望有一个看起来像这样的结构：

class OracleMixin(object):
    oracle = True
    # ... set up the oracle connection

class SqlServerMixin(object):
    sql_server = True
    # ... set up the sql server connection

class SomeTests(object):
    integration = True
    # ... define test methods here

class test_OracleSomeTests(SomeTests, OracleMixin):
    pass

class test_SqlServerSomeTests(SomeTests, SqlServerMixin):
    pass

这样,我可以像这样单独运行SQL Server测试和Oracle测试：

nosetests -a oracle
nosetests -a sql_server

或者像这样的所有集成测试：

nosetests -a integration

但是,看起来nose只会查找子类的属性,而不是基类.因此,我必须像这样定义测试类,否则测试将不会运行：

class test_OracleSomeTests(SomeTests, OracleMixin):
    oracle = True
    integration = True

class test_SqlServerSomeTests(SomeTests, SqlServerMixin):
    sql_server = True
    integration = True

维护起来有点乏味.任何想法如何解决这个问题？如果我只是处理一个基类,我只使用元类并定义每个类的属性.但是我对于测试类的元类,Oracle的元类和SQL Server的元类感到不安.

解决方法:

我不认为你可以不制作自己的插件. attrib插件中的代码只查看类__dict__.这是code

def wantClass(self, cls):
    """Accept the class if the class or any method is wanted.
    """
    cls_attr = cls.__dict__
    if self.validateAttrib(cls_attr) is not False:
        return None
    ...

你可以破解插件来做类似的事情(未经测试).

def wantClass(self, cls):
    """Accept the class if the class or any method is wanted.
    """
    for class_ in cls.__mro__: 
        cls_attr = class_.__dict__
        if self.validateAttrib(cls_attr) is not False:
            return None
    cls_attr = cls.__dict__
    ...

但是,我不确定这是元类选项的好坏.