Python assertRaise在用户定义的异常上引发 [英] Python assertRaises on user-defined exceptions
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问题描述
以下问题是由中的讨论触发的。
假定两个文件( foobar.py 和 foobar_unittest.py )。文件 foobar.py 包含一个类( FooBar ),该类具有两个功能( foo 和 bar )。函数 bar 引发一个内置的异常,函数 foo 引发一个用户定义的异常。
Assume two files (foobar.py and foobar_unittest.py). File foobar.py contains a class (FooBar) with two functions (foo and bar). Function bar raises a built-in exception, function foo a user-defined exception.
# foobar.py
class MyException(Exception):
pass
class FooBar:
def __init__(self):
pass
def bar(self):
raise ValueError('Hello World.')
def foo(self):
raise MyException('Hello World.')
。
# foobar_unittest.py
import unittest
import foobar as fb
class MyException(Exception):
pass
class FooBarTestCases(unittest.TestCase):
def test_bar(self):
with self.assertRaises(ValueError):
fb.FooBar().bar()
def test_foo(self):
with self.assertRaises(MyException):
fb.FooBar().foo()
if __name__ == '__main__':
unittest.main()
在 foobar.py 上运行单元测试时,为什么会这么有趣引发用户定义的异常( foo )的部分无法通过测试?
When running unit-test on foobar.py, why does the function raising the user-defined exception (foo) fail to pass the test?
>>> python2.7 foobar_unittest.py
.E
======================================================================
ERROR: test_foo (__main__.FooBarTestCases)
----------------------------------------------------------------------
Traceback (most recent call last):
File "foobar_unittest.py", line 11, in test_foo
fb.FooBar().foo()
File "/a_path/foobar.py", line 9, in foo
raise MyException('Hello World.')
MyException: Hello World.
----------------------------------------------------------------------
Ran 2 tests in 0.000s
FAILED (errors=1)
推荐答案
从foobar导入MyException,请不要重新定义
import MyException from foobar, don't redefine it.
import unittest
from foobar import MyException
import foobar as fb
class FooBarTestCases(unittest.TestCase):
def test_bar(self):
with self.assertRaises(ValueError):
fb.FooBar().bar()
def test_foo(self):
with self.assertRaises(MyException):
fb.FooBar().foo()
if __name__ == '__main__':
unittest.main()
此代码现在应该像
..
----------------------------------------------------------------------
Ran 2 tests in 0.001s
OK
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