我从 python.org unittest 文档中逐字复制了这个:
import random
import unittest
class TestSequenceFunctions(unittest.TestCase):
def setUp(self):
self.seq = range(10)
def test_shuffle(self):
# make sure the shuffled sequence does not lose any elements
random.shuffle(self.seq)
self.seq.sort()
self.assertEqual(self.seq, range(10))
# should raise an exception for an immutable sequence
self.assertRaises(TypeError, random.shuffle, (1,2,3))
def test_choice(self):
element = random.choice(self.seq)
self.assertTrue(element in self.seq)
def test_sample(self):
with self.assertRaises(ValueError):
random.sample(self.seq, 20)
for element in random.sample(self.seq, 5):
self.assertTrue(element in self.seq)
if __name__ == '__main__':
unittest.main()
但是我在 linux2 上从 python 2.7.2 [GCC 4.1.2 20080704 (Red Hat 4.1.2-51)] 得到这个错误消息:
.E.
======================================================================
ERROR: test_sample (__main__.TestSequenceFunctions)
----------------------------------------------------------------------
Traceback (most recent call last):
File "tmp.py", line 23, in test_sample
with self.assertRaises(ValueError):
TypeError: failUnlessRaises() takes at least 3 arguments (2 given)
----------------------------------------------------------------------
Ran 3 tests in 0.001s
FAILED (errors=1)
如何让 assertRaises()
正常工作?
最佳答案
在 python 2.7 中添加了使用 unittest.TestCase.AssertRaises() 作为上下文管理器的能力。 http://docs.python.org/2/library/unittest.html#unittest.TestCase.assertRaises
关于python 单元测试 assertRaises,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/17585207/