我试图创建一个单元测试来检查python3.4代码的错误处理。我使用mock中的MagicMock替换子函数并将异常作为副作用引发,然后使用unittest中的assertRaises来检查是否引发了异常。在
不幸的是,虽然代码似乎正在处理异常,但测试似乎因为异常而崩溃。我曾尝试重写测试以使用try/except循环,但没有效果,我尝试将其转换为nose2@raise AttributeError,但没有成功。在
代码中的错误处理是否以某种方式阻止了测试捕获引发的异常?在
代码:
import unittest2 as unittest
from mock import MagicMock
class Service():
def _execute(self, entity, destport):
print("setting format to json")
self.format = "json"
try:
print("call _reply_in_json")
getattr(self, "_reply_in_%s" % self.format)(entity, destport)
return ""
except AttributeError:
print("Invalid format requested")
err = "invalid format requested"
return err
class TestService(unittest.TestCase):
def test_executeAttributeError(self):
self.entity = "butter"
self.destport = 54
self.ret = False
print("## Starting test_executeAttributeError for CsvDs")
# Set up test objects
testDS = Service()
testDS._reply_in_json = MagicMock(name='_reply_in_json', side_effect=Exception(AttributeError))
# Run the test
with self.assertRaises(AttributeError):
print("Execute new request")
self.ret = testDS._execute(self.entity, self.destport)
if self.ret:
self.assertEqual(self.ret, "invalid format requested")
# Check the call was made correctly.
testDS._reply_in_json.assert_called_once_with(self.entity, self.destport)
else:
print("nothing returned")
print("test_executeAttributeError for CsvDs completed successfully\n")
if __name__ == '__main__':
suite = unittest.TestLoader().loadTestsFromTestCase(TestService)
unittest.TextTestRunner(verbosity=2).run(suite)
输出:
^{pr2}$
您并不是在副作用中引发AttributeError,而是引发一个以AttributeError作为参数的基异常。直接使用实际的异常:
还要注意,
assertRaises
将失败,因为_execute
捕捉到该异常并返回错误消息,因此测试用例本身不会看到任何异常。在相关问题 更多 >
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