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Re: How to parameterize unittests

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Antoon Pardon <antoon.pardon@rece.vub.ac.be>
Newsgroups comp.lang.python
Subject Re: How to parameterize unittests
Date Fri, 15 Apr 2016 14:48:11 +0200
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Op 15-04-16 om 13:43 schreef Antoon Pardon:
> Op 15-04-16 om 11:10 schreef Steven D'Aprano:
>> If you have code which is not parameterized, and you want to parameterize
>> it, you have to refactor. Unit tests are no different from anything else.
> I don't agree with that. If I have a piece of code that I want to parameterize,
> Often enough all I need to do is shift the code to the right. Prepend a def
> line and use a parameter with the same name as the more global variable I
> was using before. I don't need to change access to the variable in the code.

Some prelimary tests seems to suggest this idea might work here too.

Starting from this:

    class Test_AVLTree(unittest.TestCase):
 
        def test_empty_tree_is_false(self):
            instance = avltree()
            self.assertFalse(instance)

Changing it into this:

    def MakeAVLTest(avltree):
        class Test_AVLTree(unittest.TestCase):

            def test_empty_tree_is_false(self):
                instance = avltree()
                self.assertFalse(instance)

        return Test_AVLTree

    AVLTest = MakeAVLTest(avltree)
    MyTreeTest = MakeAVLTest(mytree)

Seems to work

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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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