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

[Wainer dos Santos Moschetta]

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 <address@hidden>
> ---
>   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()


> +            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').

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)