[pytest-dev] [TIP] pytest - parametrizing some arguments require parametrization at collection phase and some at setup time?
Elizabeth Lin
elin at splunk.com
Fri Apr 5 19:08:26 CEST 2013
Hi Holger,
Thanks for responding! Comments inline below.
On 4/4/13 11:14 PM, "holger krekel" <holger at merlinux.eu> wrote:
>Hi Elizabeth,
>
>And sorry for taking a while but i am still not sure i fully understand.
>I am pretty sure we can find a solution but i'd like to find one that
>fits the problem :)
>
>Could you clarify your problem purely from the test function side?
>Particularly, if you have this test:
>
> @params([
> ['color', 'type'],
> { 'argvalues': [ 'blue', 'cat'] },
> { 'argvalues': ['pink', 'dog'] }
> ])
> def test_example(myfixture, color, type):
> # this is the new test we want to add
> assert 0
>
>do i understand it right that ``myfixture`` should be indirectly
>created by using ["std", "pro"] as respective parameters because
>there is a @params decorator? And that for
Yes, myfixture should be indirectly created when we call
metafunc.parametrize to pass in ["std", "pro"] as parameters, but only for
specific tests - in this case the tests generated should be:
- std, blue, cat
- std, pink, dog
- pro, blue, cat
- pro, pink dog
>
> def test_something(myfixture):
> # existing test which only uses std fixture
> assert 0
>
>you only want ``myfixture`` created with the "std" parameter?
Yes, that's correct. So only test should be
- std
>
>And that for:
>
> @params([
> {'arg1': 1, 'arg2': 2},
> {'arg1': 3, 'arg2': 5}
> ])
> def test_old_style(arg1, arg2):
> # existing tests which don't use fixtures
> assert 0
>
>you don't want any "myfixture" created at all?
Also correct. Generated tests should be
- 1, 2
- 3, 5
Cheers,
Liz
>
>
>cheers,
>holger
>
>
>
>On Thu, Apr 04, 2013 at 22:51 +0000, Elizabeth Lin wrote:
>
>> Hi,
>>
>> I have some tests which I'd like to parametrize using both more complex
>> fixtures as well as simple string arguments. How are folks doing this
>> currently? Or is this a use case that hasn't been seen before? Using
>> metafunc.parametrize in a pytest_generate_test hook won't work for me
>> since I need the fixtures to have indirect=True to pass the argname as a
>> request.param, but the other arguments to have indirect=False.
>>
>> For example, if I have a test fixture and test case which looks like the
>> following:
>> Any suggestions for how to accomplish this would be much appreciated!
>>
>>
>> def pytest_generate_tests(metafunc):
>> if metafunc.function.__name__ == 'test_example':
>> argnames = []
>> argvalues = []
>> parameters = getattr(metafunc.function, 'paramlist', ())
>> for p in parameters:
>> if type(p) == list:
>> argnames = tuple(['myfixture'] + p)
>> else:
>> argvalues.append = tuple(['std'] + p['argvalues'])
>> argvalues.append = tuple(['pro'] + p['argvalues'])
>> # I want to do the following, but it won't work since some of the
>> # args need indirect set to true
>> # and some need indirect set to false.
>> metafunc.parametrize(argnames, argvalues, indirect=True)
>> elif 'myfixture' in metafunc.fixturenames:
>> # we have existing tests which use the fixture, but only with std
>> metafunc.parametrize("myfixture", "std")
>> else:
>> # we have existing tests which use older style parametrization,
>> # non-fixture
>> for p in getattr(metafunc.function, 'paramlist', ()):
>> metafunc.addcall(funcargs=p)
>>
>>
>> def params(decolist):
>> def wrapper(function):
>> function.paramlist = decolist
>> return function
>> return wrapper
>>
>> @pytest.fixture
>> def myfixture(request):
>> if request.param == 'std':
>> myfix = SomeObject()
>> elif request.param == 'pro':
>> myfix = SomeOtherObject()
>> def fin():
>> myfix.close()
>> request.addfinalizer(fin)
>> return myfix
>>
>> @params([
>> ['color', 'type'],
>> { 'argvalues': [ 'blue', 'cat'] },
>> { 'argvalues': ['pink', 'dog'] }
>> ])
>> def test_example(myfixture, color, type):
>> # this is the new test we want to add
>>
>> def test_something(myfixture):
>> # existing test which only uses std fixture
>>
>> @params([
>> {'arg1': 1, 'arg2': 2},
>> {'arg1': 3, 'arg2': 5}
>> ])
>> def test_old_style(arg1, arg2):
>> # existing tests which don't use fixtures
>>
>>
>> Thanks for reading through this! I know it's rather long.
>>
>> Cheers,
>> Liz
>>
>>
>>
>>
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