Issue7465
Created on 2009-12-10 02:20 by awaltman, last changed 2022-04-11 14:56 by admin. This issue is now closed.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| unittest_doesnt_reinstantiate_members.txt | awaltman, 2009-12-10 02:20 | Code and output | ||
| Messages (3) | |||
|---|---|---|---|
| msg96189 - (view) | Author: Aaron Altman (awaltman) | Date: 2009-12-10 02:20 | |
Not sure if this is intended behavior. I have a baseClass I'm writing tests for. My test architecture has an instance of this baseClass assigned as a member of TestBaseClass(unittest.TestCase) in TestBaseClass.setUp. The problem occurs when tests in TestBaseClass modify state within the member baseClass instance. I think there should be a fresh new instance of baseClass for every test that gets run, but the old state from the last test is still there. Example code and output from Python 2.6.2 attached. |
|||
| msg96192 - (view) | Author: R. David Murray (r.david.murray) *  |
Date: 2009-12-10 02:42 | |
Yes, this working as intended. Consider:
Python 2.7a1+ (trunk:76725, Dec 9 2009, 09:26:36)
[GCC 4.4.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> class baseClass(object):
... def __init__(self, testList=[]):
... self.testList = testList
... def insertItem(self):
... self.testList.append("testing from baseClass")
...
>>> a = baseClass()
>>> b = baseClass()
>>> del b
>>> a.insertItem()
>>> print a.testList
['testing from baseClass']
>>> b = baseClass()
>>> print b.testList
['testing from baseClass']
See
http://docs.python.org/faq/design.html#why-are-default-values-shared-between-objects
for an explanation of why.
|
|||
| msg96193 - (view) | Author: R. David Murray (r.david.murray) * |
Date: 2009-12-10 02:46 | |
Heh, that first b = baseClass(); del b wasn't supposed to be there and doesn't change the result, just in case you were wondering. |
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:55 | admin | set | github: 51714 |
| 2009-12-10 02:46:30 | r.david.murray | set | messages: + msg96193 |
| 2009-12-10 02:42:22 | r.david.murray | set | status: open -> closed priority: normal type: behavior nosy:
+ r.david.murray |
| 2009-12-10 02:21:34 | awaltman | set | title: Call to another class's constructor in unittest.TestCase.setUp returns the same instance -> Call to another class's constructor in unittest.TestCase.setUp returns the same instance multiple times |
| 2009-12-10 02:20:55 | awaltman | create | |