Re: [PATCH 2/3] Acceptance tests: introduce utility method for tags unique vals

[Cleber Rosa <crosa@redhat.com>]

On Thu, Oct 24, 2019 at 06:12:25PM -0300, Wainer dos Santos Moschetta wrote:
> Hi Cleber,
> 
> On 9/24/19 4:45 PM, Cleber Rosa wrote:
> > Currently a test can describe the target architecture binary that it
> > should primarily be run with, be setting a single tag value.
> > 
> > The same approach is expected to be done with other QEMU aspects to be
> > tested, for instance, the machine type and accelerator, so let's
> > generalize the logic into a utility method.
> > 
> > Signed-off-by: Cleber Rosa <crosa@redhat.com>
> > ---
> >   tests/acceptance/avocado_qemu/__init__.py | 19 +++++++++++++------
> >   1 file changed, 13 insertions(+), 6 deletions(-)
> > 
> > diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
> > index bd41e0443c..02775bafcf 100644
> > --- a/tests/acceptance/avocado_qemu/__init__.py
> > +++ b/tests/acceptance/avocado_qemu/__init__.py
> > @@ -54,14 +54,21 @@ def pick_default_qemu_bin(arch=None):
> >   class Test(avocado.Test):
> > +    def _get_unique_tag_val(self, tag_name):
> > +        """
> > +        Gets a tag value, if unique for a key
> > +        """
> > +        vals = self.tags.get(tag_name, [])
> > +        if len(vals) == 1:
> 
> 
> An small optimization:
> 
> if vals:
> 
>   return vals.pop()
>

IIUC, this would break the idea of uniqueness that this method, for
now, has.  Read on.

> 
> > +            return vals.pop()
> > +        return None
> 
> Does it allows to express a scenario like "I want my test method to run on
> x86_64 and aarch64" using tags? If so, _get_unique_tag_val logic returns
> None for multi-value tags (e.g. 'tags=arch:x86_64,arch:aarch64').
>

I thought that initially we should attempt to pick a default arch or
machine type only of len(vals) == 1.  Not because what you describe
can't be done, but because I would like to go through the tests and
make sure we run them in all the given tagged arches when we allow
that.

Thanks,
- Cleber.

> Thanks,
> 
> Wainer
> 
> > +
> >       def setUp(self):
> >           self._vms = {}
> > -        arches = self.tags.get('arch', [])
> > -        if len(arches) == 1:
> > -            arch = arches.pop()
> > -        else:
> > -            arch = None
> > -        self.arch = self.params.get('arch', default=arch)
> > +
> > +        self.arch = self.params.get('arch',
> > +                                    default=self._get_unique_tag_val('arch'))
> > +
> >           default_qemu_bin = pick_default_qemu_bin(arch=self.arch)
> >           self.qemu_bin = self.params.get('qemu_bin',
> >                                           default=default_qemu_bin)