[TIP] combining markers in pytest

[holger krekel]

Hi Chris,

On Fri, Oct 19, 2012 at 17:40 -0400, Pella,Chris wrote:
> I'm trying to find out if we can combine markers in a Boolean way using pytest. Let's say we have some tests that can be marked as 'regression', or 'smoke', or 'nightly_build'. We have some other tests that are platform-specific and we mark as linux_x86_32 , solaris_sparc_32 etc...
> Is there a way to combine these so that we can say include a linux_x86_32 test as part of the nightly build?
> If you stack the markers like below it will 'or' the markers so that it will always run if  py.test -m nightly  is used even if linux_x86_32 is not set:
> @pytest.marker.nightly
> @pytest.marker.linux_x86_32
> def test_me():
>                 ...
> 
> What is the best way to select tests when there are multiple pre-conditions involved? Should we just be organizing test classes differently (this would involve code duplication and doesn't appeal) ?  We are setting up automated testing using Jenkins over multiple client platforms and with multiple test targets (we make embedded systems), and want to designate different types of test runs.

the "-m" option allows to specify an expression, so you can do:

    py.test -m "nightly and linux_x86_32" 

or 

    py.test -m "nightly and not linux_x86_32" 

etc. it's really an arbitrary expression - marker names that
are not present will yield a False value.  If the documentation 
or help strings are not clear enough about it, feedback/reporting an issue
is welcome!

HTH,
holger

> Chris
> 
> 
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