为Python2.6的单元模块unittest做hack

我在Windows上开发Python用的版本是2.7，在Ubuntu上开发的版本是2.6，而在Python的unittest模块中，有几个方法是在2.7才有的，它们是：

Method	Checks that	New in
assertEqual(a,b)	a ==b
assertNotEqual(a,b)	a !=b
assertTrue(x)	bool(x) is True
assertFalse(x)	bool(x) is False
assertIs(a,b)	a isb	2.7
assertIsNot(a,b)	a isnotb	2.7
assertIsNone(x)	x isNone	2.7
assertIsNotNone(x)	x isnotNone	2.7
assertIn(a,b)	a inb	2.7
assertNotIn(a,b)	a notinb	2.7
assertIsInstance(a,b)	isinstance(a, b)	2.7
assertNotIsInstance(a,b)	not isinstance(a,b)	2.7

为了能让在Python2.7上开发的单元测试代码顺利地在Python2.6上运行，我做了一下hack。

#!/usr/bin/python
#coding: UTF-8
"""
@author: CaiKnife
"""

import __init__, unittest

def __getattr__(self, name):
if name in ("assertIs", "assertIsNone"):
statement = "a is b"
elif name in ("assertIsNot", "assertIsNotNone"):
statement = "a is not b"
elif name == "assertIn":
statement = "a in b"
elif name == "assertNotIn":
statement = "a not in b"
elif name == "assertIsInstance":
statement = "isinstance(a, b)"
elif name == "assertIsNotInstance":
statement = "not isinstance(a, b)"
else:
statement = "True"

def wrapper(a=None, b=None):
return self.assertTrue(eval(statement))
return wrapper

unittest.TestCase.__getattr__ = __getattr__

class TestCase(unittest.TestCase):
def test_func(self):
self.assertHahahaha()

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

测试顺利通过，默认调用不存在的assert方法时，让它乐观地通过测试吧。