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B. 尚未开始的新班级
原标题:new class instance not being initialized

我撰写一份包裹,并做我的测试,像一位极少数方案家一样,但这里的情况是:

class TestOne(unittest.TestCase):
    def setUp(self):
        self.finder = Finder()

    def test_default_search_parts(self):
        self.assertEqual(self.finder.search_parts, [])

class TestTwo(unittest.TestCase):
    def setUp(self):
        self.finder = Finder()

    def test_add_letter(self):
        self.finder.add( a )
        self.assertNotEqual(self.finder.search_parts, [])

在此情况下,<编码>试验_default_search_parts与Assertion Error: [a] != [ ]test_add_letter/code>。 我不知道这里的情况。 当I rewrite test_default_search_parts时,它确实受到欢迎:

def test_default_search_parts(self):
    f = Finder()
    self.assertEqual(f.search_parts, [])

同样的失败也发生。 我在开始我的事例时做了什么错误呢?

如果是这样的话,Oh和Im使用鼻子管理。

最佳回答

正如所提到,如果是同级属性,共同国家可能会造成问题。 下面是你可能的情况:

import unittest

# bad implementation of Finder, class-level attribute
class Finder(object):
    search_parts = []

    def add(self, letter):
        self.search_parts.append(letter)


# using  Zne  here makes sure this test is run second        
class TestZne(unittest.TestCase):
    def setUp(self):
        print  I am run next 
        self.finder = Finder()

    def test_default_search_parts(self):
        self.assertEqual(self.finder.search_parts, [])


class TestTwo(unittest.TestCase):
    def setUp(self):
        print  I am run first 
        self.finder = Finder()

    def test_add_letter(self):
        self.finder.add( a )
        self.assertNotEqual(self.finder.search_parts, [])

unittest.main()

Outputs

Traceback (most recent call last):
  File "test.py", line 18, in test_default_search_parts
    self.assertEqual(self.finder.search_parts, [])
AssertionError: Lists differ: [ a ] != []

问题是,所有Finder案件都属于这一级属性搜查——部分,加上——信函是在违约搜查测试之前进行的。

解决,使用诸如:

class Finder(object):
    def __init__(self):
        self.search_parts = []

这将确保它只是一个instance属性。

问题回答

暂无回答




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