用python提供测试数据

问题描述

| 如何对许多不同的数据运行相同的测试？我想被举报所有失败。 例如：

def isEven(number):
    return True # quite buggy implementation

data = [ 
    (2,True),(3,False),(4,(5,]

class MyTest:
   def evenTest(self,num,expected):
       self.assertEquals(expected,isEven(num))

我找到了仅在首次失败时引发错误的解决方案： http://melp.nl/2011/02/PHPunit-style-data-provider-in-python-unit-test/ 如何运行测试以报告所有失败？     

解决方法

        您应该使用

py.test

，我认为unittest模块是从junit盲目复制的，无论如何您都可以这样破解

import unittest

data = [ 
    (2,True),(3,False),(4,(5,False)]

# this should be imported from a separate module.
def isEven(number):
    return True # quite buggy implementation

def create_test_func(num,expected):
    def _test_func(self):
        self.assertEqual(expected,isEven(num))
    return _test_func

class TestIsEven(unittest.TestCase):

    pass

# pyunit isn\'t pythonic enought use py.test instead
# till then we rely on such hackery
import new
for i,(num,expected) in enumerate(data):
    setattr(TestIsEven,\'test_data_%d\'%i,create_test_func(num,expected))

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

输出为：

.F.F
======================================================================
FAIL: test_data_1 (__main__.TestIsEven)
----------------------------------------------------------------------
Traceback (most recent call last):
  File \"untitled-1.py\",line 15,in _test_func
    self.assertEqual(expected,isEven(num))
AssertionError: False != True

======================================================================
FAIL: test_data_3 (__main__.TestIsEven)
----------------------------------------------------------------------
Traceback (most recent call last):
  File \"untitled-1.py\",isEven(num))
AssertionError: False != True

----------------------------------------------------------------------
Ran 4 tests in 0.000s

FAILED (failures=2)

使用这种方法，您可以添加更多细节，例如在失败时打印调试信息等。     ,        一种解决方案是为

data

中的每个条目创建不同的测试用例实例：

class MyTest(unittest.TestCase):
    def __init__(self,num,expected):
        unittest.TestCase.__init__(self,\"evenTest\")
        self.num = num
        self.expected = expected
    def evenTest(self):
        self.assertEqual(self.expected,isEven(self.num))

为了使

unittest

知道如何构造测试用例，请向模块添加

load_tests()

函数：

def load_tests(loader,tests,pattern):
    return unittest.TestSuite(MyTest(num,expected)
                              for num,expected in data)

    ,        您是否正在寻找这样的东西：

import unittest


def is_even(number):
    return True # quite buggy implementation


class TestCase(unittest.TestCase):
    def setUp(self):
        self.expected_output = [
            (2,False)
        ]

    def test_is_even(self):
        real_res = []

        for arg,_ in self.expected_output:
            real_res.append((arg,is_even(arg)))

        msg_error = \'\\nFor %s Expected %s Got %s\'
        msg = []
        for res1,res2 in zip(real_res,self.expected_output):
            if res1[1] != res2[1]:
                msg.append(msg_error % (res1[0],res1[1],res2[1]))


        self.assertEqual(real_res,self.expected_output,\"\".join(msg))


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

输出：

F
======================================================================
FAIL: test_is_even (__main__.TestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File \"test.py\",line 29,in test_example
    self.assertEqual(real_res,\'\'.join(msg))
AssertionError: 
For 3 Expected True Got False
For 5 Expected True Got False

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)

    ,        如果您使用的是pytest，则可以这样操作：

import pytest                                                                                                                   

def is_even(number):
    return True # quite buggy implementation

@pytest.mark.parametrize(\"number,expected\",[
    (2,False)
])
def test_is_even(number,expected):
    assert is_even(number) == expected

您会得到类似（缩短）的信息：

/tmp/test_it.py:13: AssertionError
=========== 2 failed,2 passed in 0.01 seconds ====================

    ,        我还从这个答案中找到了阿德里安·帕纳西乌克的方法： Python的单元测试和测试用例的动态创建 使用此解决方案，可以根据数据设置不同的测试名称。     ,        

import unittest

data = [ 
    (2,False)]

# this should be imported from a separate module.
def isEven(number):
    return True # quite buggy implementation


class TestIsEven(unittest.TestCase):
    def test_is_even(self):
        for num,expected in data:
            self.assertEqual(expected,isEven(num))