Python单元测试：具有自己的构造函数的testcase类在标准库中失败

Python unit test: testcase class with own constructor fails in standard library

本问题已经有最佳答案，请猛点这里访问。

我有这个简单的vanilla单元测试，只要我省略了构造函数，它就会按预期工作。

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import sys
import unittest

class Instance_test(unittest.TestCase):

def __init__(self):
super(Instance_test, self).__init__()
self.attribute ="new"

def test_something(self):
pass

def test_other(self):
self.assertTrue(True)
pass

def setUp(self):
pass

def tearDown(self):
pass

def suite():
return unittest.makeSuite(Instance_test,"test")

def main():
runner = unittest.TextTestRunner(sys.stdout)
runner.run(suite())

if __name__ =="__main__":
main()

使用构造函数获取此回溯：

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Traceback (most recent call last):
File"f:\gt\check.py", line 31, in main()
File"f:\gt\check.py", line 28, in main
runner.run(suite())
File"f:\gt\check.py", line 24, in suite
return unittest.makeSuite(Instance_test,"test")
File"C:\Python34\lib\unittest\loader.py", line 374, in makeSuite
testCaseClass)
File"C:\Python34\lib\unittest\loader.py", line 70, in loadTestsFromTestCase
loaded_suite = self.suiteClass(map(testCaseClass, testCaseNames))
File"C:\Python34\lib\unittest\suite.py", line 24, in __init__
self.addTests(tests)
File"C:\Python34\lib\unittest\suite.py", line 60, in addTests
for test in tests:
TypeError: __init__() takes 1 positional argument but 2 were given

有什么不对，我怎么能拥有一个由不同的test_xxx方法共享的中心属性？