[U-Boot] [PATCH] test/py: Fix exception, do not parametrize with empty set

["Brüns, Stefan" <Stefan.Bruens@rwth-aachen.de>]

On Montag, 17. Oktober 2016 12:11:26 CEST Stephen Warren wrote:
> On 10/16/2016 12:17 PM, Stefan Br?ns wrote:
> > If the parameter set is empty, the pytest setup fails:
> > ---
> > 
> >     call: <CallInfo when='setup' exception: got empty parameter set
> >     ['env__dfu_config'], function test_dfu at [...]test_dfu.py:107>
> > 
> > ---
> > 
> > This aborts pytest_runtest_makereport and later leads to an exception
> > during the report generation, as the call to log.start_section(...)
> > is never executed:
> > ---
> > 
> >     Exception: Block nesting mismatch:
> >     "test_dfu[env__usb_dev_port0-env__dfu_config0]" ""
> > 
> > ---
> 
> How do you trigger this? I believe my test setup has many cases where
> the test you added would trigger, but without the issues you mention,
> but I'm not 100% sure since I don't know for sure what is causing this
> issue.
> 
> Which pytest version do you have? I appear to have 2.5.1 (on Ubuntu Trusty)

1. You need "dfu_configs" to be empty
2. Maybe its pytest version dependent, IIRC I have 3.0.2

The first error above can be seen when running pytest with "--debug", it is 
written to IIRC pytestdebug.log

Kind regards,

Stefan