python - 属性错误 : object has no attribute '_type_equality_funcs'

Question

我的程序的 Unittest 模块实现出现以下错误

File "/usr/lib/python2.7/unittest/case.py", line 493, in _getAssertEqualityFunc
    asserter = self._type_equality_funcs.get(type(first))
AttributeError: 'Utility' object has no attribute '_type_equality_funcs'  

当我尝试创建一个公共(public)类并尝试通过公共(public)类实用程序测试函数执行时出现上述错误，但使用正常的 Unittest 类实现没有出现错误。

下面是执行无误程序的详细解释

class BaseTestCase(unittest.TestCase):

    def __init__(self, methodName='runTest', param=None):
        super(BaseTestCase, self).__init__(methodName)
        self.param = param

    @staticmethod
    def parametrize(testcase_klass, param=None):

        testloader = unittest.TestLoader()
        testnames = testloader.getTestCaseNames(testcase_klass)
        suite = unittest.TestSuite()
        for name in testnames:
            suite.addTest(testcase_klass(name, param=param))
        return suite

现在我正在继承 BaseTestCase 类并调用测试用例..

     class salesgrowth_DevInt(BaseTestCase):
          def setUp(self):
                print "constructor"
                pwd = os.getcwd()

     def test4_refactoring(self,log):
             if (STATUS.lower() == "completed" or STATUS == "Actor : SUCCESS"):`enter code here`
                  self.assertEqual(os.stat(OUTPUT + '/tes1.txt').st_size, 0,
                 'employee count  is not matching with master data . Different  entries are in test1.txt\n')

至此一切正常

现在像 salesgrowth_DevInt 测试用例一样，没有其他测试用例继承 BaseTestCase 并执行 test4_refactoring 测试用例(这里例如测试用例没有删除行)，以避免重复代码 我已经创建了公共(public)类 Utility，包括 test4_refactoring 函数，服务于所有测试用例，如 salesgrowth_DevInt。

下面是通用实用类代码

import sys
import json, sys, os, argparse, commands, time, string, filecmp
import unittest

class Utility(object):
    ''' common utility class for common test cases  operations'''

    def __init__(self):
        print "constructor"
        pwd = os.getcwd()
        print "Current working directlry %s\n" % pwd
        global scriptpath
        scriptpath = os.path.join(pwd, "src/Runner/")
        maxDiff = int(80)


     def test4_refactoring(self,STATUS,BASE,ANALYSIS_DIR,OUTPUT,log):
            print "common function"
            log.write('\n')
             if (STATUS.lower() == "completed" or STATUS == "Actor : SUCCESS"):
                  self.assertEqual(os.stat(OUTPUT + '/tes1.txt').st_size, 0,
                 'employee count  is not matching with master data . Different  entries are in test1.txt\n')




     but using utility code when i try to execute below statment
     self.assertEqual(os.stat(OUTPUT + '/tes1.txt').st_size, 0,
                 'employee count  is not matching with master data . Different  entries are in test1.txt\n') 


    getting below errors


Traceback (most recent call last):
  File "/src/testCases/salesgrowth_DevInt.py", line 96, in test4_refactoring
    utils_obj.test4_refactoring(self.STATUS,self.BASE,self.ANALYSIS_DIR,self.OUTPUT,log)
  File "/src/common/Utils.py", line 436, in test4_refactoring
    'employee count  is not matching with master data. Different entries are in test1.txt\n')
  File "/usr/lib/python2.7/unittest/case.py", line 512, in assertEqual
    assertion_func = self._getAssertEqualityFunc(first, second)
  File "/usr/lib/python2.7/unittest/case.py", line 493, in _getAssertEqualityFunc
    asserter = self._type_equality_funcs.get(type(first))
AttributeError: 'Utility' object has no attribute '_type_equality_funcs'




 Please let me know if any one has any pointers or suggestion for above issue and what is wrong in above implementation.

Answer 1

self.assertEqual 将仅对继承 unittest.TestCase 类的类可用，而您的 Utility 类不会这样做。

我建议尝试将您的 Utility 方法放在 BaseTestCase 类下。

给它起一个不以 test_ 开头的名称，稍后调用这个新函数来验证您对许多其他函数的断言。