Hi,
> > > Also do we want to assert that the dummy0 device is listed in the /sys
> > > inside the namespace?
> > 
> > Don't you think that this is sufficient ?
> > 
> > ns_exec $NS_HANDLE ip link add dummy0 type dummy || \                       
> >     
> >     tst_brkm TBROK "failed to add a new dummy device"
>
> We are testing sysfs in network namespaces, so I'm tepmted to do
> something as:
>
> if [ -d /sys/class/net/dummy0 ]; then
>       tst_resm TPASS ...
> else
>       tst_resm TFAIL ...
> fi
>
> After sysfs is mounted.

Actually not a bad idea, we will have one more TC. But don't forget
that checking this must be done inside the separated namespace and only
AFTER mounting sysfs, so something like this:

ns_exec $NS_HANDLE test -d /sys/class/net/dummy0
if [ $? -eq 0 ]; then
        tst_resm TPASS ...
else
        tst_resm TFAIL ...
fi

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