Re: [Qemu-devel] [ANNOUNCE] qemu-test: a set of tests scripts for QEMU

[Stefan Hajnoczi <stefanha@gmail.com>]

On Mon, Jan 02, 2012 at 03:07:08PM +0100, Paolo Bonzini wrote:
> On 12/29/2011 07:33 PM, Anthony Liguori wrote:
> >
> >FWIW, I expect virtio-scsi to be the first guinea pig here...  I believe
> >Stefan has already started looking at writing some qtest based tests for
> >virtio-scsi.
> 
> I'm curious, because a SCSI HBA makes it as hard as it can be to
> write unit tests.  Pretty much everything you do will test the
> interactions between the SCSI devices and the block layer, more than
> the HBA itself.  This is especially for such a simple HBA; unit
> testing is much more "interesting" for something like the LSI
> device.
> 
> So, to test the HBA you need write either a mock SCSI device, or a
> mock block device.  (I hate mocks).  Now that the client is
> asynchronous, NBD is a pretty effective way to write a mock block
> device, though not the simplest.

I haven't started yet but I am planning to write qtest virtio PCI tests
and will definitely be taking a look at virtio-scsi.

We don't necessarily need mock devices, just really simply temporary raw
files or similar.  On the other hand mock devices can be a good solution
for programmatically verifying that our intended action was performed on
the host device.

Stefan