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Re: [libvirt] [PATCH 0/3] libxl: Add a test suite for libxl_domain_config generator

On 07/27/2017 04:51 PM, Marek Marczykowski-Górecki wrote:
> On Thu, Jul 27, 2017 at 03:24:38PM -0600, Jim Fehlig wrote:
>> Did you have any comment on the approach taken in the attachments to this
>> thread? Particularly the patch titled "libxl: make emulator checks
>> mockable"?
> I don't see how macros could solve this - those are expanded at
> individual files compilation time. And you don't recompile the driver
> for tests.

Right. I went back to my mocking attempt and thought that I had something working


But while testing I forgot to remove my /usr/lib/xen/bin/qemu-system-i386
specified in the test files. Once I renamed it, the tests fail with "unsupported
configuration: emulator '/usr/lib/xen/bin/qemu-system-i386' not found". So the
mocked emulator checks are not called :-(.

> Something that could work would be putting those two functions into
> separate shared object, then override using LD_PRELOAD or something like
> this. But it would require significant change in the driver structure
> just for tests. Alternatively something similar could be done by
> covering lower level functions (virFileExists, virCommandRun, or even
> open, stat etc).
> Using /bin/true is much simpler anyway.

Unless you spot something obvious in the V2 that I've overlooked, I'm beginning
to agree.


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