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Re: How to parameterize unittests

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From Chris Angelico <rosuav@gmail.com>
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Subject Re: How to parameterize unittests
Date Fri, 15 Apr 2016 17:42:16 +1000
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On Fri, Apr 15, 2016 at 4:52 PM, Antoon Pardon
<antoon.pardon@rece.vub.ac.be> wrote:
> Op 14-04-16 om 17:05 schreef Steven D'Aprano:
>> On Fri, 15 Apr 2016 12:08 am, Antoon Pardon wrote:
>>
>>> I have a unittest for my avltree module.
>>>
>>> Now I want this unittest to also run on a subclass of avltree.
>>> How can I organise this, so that I can largely reuse the
>>> original TestCase?
>>
>> class Test_AVLTree(unittest.TestCase):
>>     tree = avltree
>>
>>     def test_empty_tree_is_false(self):
>>         instance = self.tree()
>>         self.assertFalse(instance)
>>
>>
>> class Test_MySubclassTree(Test_AVLTree):
>>     tree = My_Subclass_Tree
>
> I see, that's going to be a lot of cut & pastes.
> Thanks.

Not really; the first class has all the tests, and the second one is
literally just those two lines. It overrides 'tree' (accessed inside
methods as 'self.tree'), and since all the tests are written to
instantiate self.tree, they are effectively parameterized.

ChrisA

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Thread

How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-14 16:08 +0200
  Re: How to parameterize unittests Steven D'Aprano <steve@pearwood.info> - 2016-04-15 01:05 +1000
    Re: How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-15 08:52 +0200
    Re: How to parameterize unittests Chris Angelico <rosuav@gmail.com> - 2016-04-15 17:42 +1000
    Re: How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-15 10:20 +0200
      Re: How to parameterize unittests Steven D'Aprano <steve@pearwood.info> - 2016-04-15 19:10 +1000
        Re: How to parameterize unittests Michael Selik <michael.selik@gmail.com> - 2016-04-15 10:05 +0000
        Re: How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-15 13:43 +0200
        Re: How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-15 14:48 +0200
          Re: How to parameterize unittests Steven D'Aprano <steve@pearwood.info> - 2016-04-16 02:47 +1000
            Re: How to parameterize unittests Chris Angelico <rosuav@gmail.com> - 2016-04-16 03:51 +1000
            Re: How to parameterize unittests Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-04-16 22:37 +0200
    Re: How to parameterize unittests Serhiy Storchaka <storchaka@gmail.com> - 2016-04-15 11:24 +0300
    Re: How to parameterize unittests Chris Angelico <rosuav@gmail.com> - 2016-04-15 18:28 +1000
    Re: How to parameterize unittests Serhiy Storchaka <storchaka@gmail.com> - 2016-04-15 11:31 +0300
    Re: How to parameterize unittests Ben Finney <ben+python@benfinney.id.au> - 2016-04-15 18:35 +1000

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