抑制单元测试中的打印输出 [英] Suppress print output in unittests

问题描述

请注意我使用的是 Python 2.6(如标记)

Please notice I'm using Python 2.6 (as tagged)

假设我有以下内容:

class Foo:
    def bar(self):
        print 'bar'
        return 7

假设我有以下单元测试:

And say I have the following unit test:

import unittest
class ut_Foo(unittest.TestCase):
    def test_bar(self):
        obj = Foo()
        res = obj.bar()
        self.assertEqual(res, 7)

所以如果我跑:

unittest.main()

我明白了:

bar # <-- I don't want this, but I *do* want the rest
.
----------------------------------------------------------------------
Ran 1 test in 0.002s

OK
Exit code:  False

我的问题是:有没有办法抑制被测试对象的输出，同时仍然获得单元测试框架的输出?

My question is: Is there a way to suppress the output of the object being tested while still getting the output of the unittest framework?

编辑这个问题不是 标记的问题 的重复，该问题询问在普通 python 脚本中沉默特定函数的标准输出.

Edit This question is not a duplicate of the flagged question which is asking about silencing stdout of a particular function within a normal python script.

而这个问题询问的是在运行单元测试时隐藏 python 脚本的正常标准输出.我仍然希望显示 unittest 标准输出，并且我不想禁用我的测试脚本的标准输出.

Whereas this question is asking about hiding the normal stdout of a python script while running it's unittests. I still want the unittest stdout to be displayed, and I don't want to disable the stdout of my tested script.

推荐答案

使用选项-b"调用单元测试 - 缓冲标准输出和标准错误

Call your unittest with option "-b" - buffer stdout and stderr

class Foo:
    def bar(self):
        print "bar"
        return 7

test.py

import unittest
from Foo import Foo

class test_Foo(unittest.TestCase):
    def test_bar(self):
        obj = Foo()
        res = obj.bar()
        self.assertEqual(res, 7)

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

使用 -b 选项运行它

$ python test.py -b
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK

替代方案:使用nose

$ pip install nose

什么安装命令nosetests

注意，我已经修改了测试套件，使其类和方法以 test 为前缀，以满足 nose 默认测试发现规则.

Note, that I have modified test suite to have class and methods prefixed by test to satisfy nose default test discovery rules.

nosetests 默认不显示输出

$ nosetests
.
----------------------------------------------------------------------
Ran 1 test in 0.002s

OK

如果要查看输出，请使用 -s 开关:

If you want to see the output, use -s switch:

$ nosetests -s
bar
.
----------------------------------------------------------------------
Ran 1 test in 0.002s

OK

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