Re: [PATCH 06/12] tests/qemu-iotests: add QEMU_IOTESTS_REGEN=1 to update reference file

[Eric Blake <eblake@redhat.com>]

On Thu, Mar 03, 2022 at 04:03:24PM +0000, Daniel P. Berrangé wrote:
> When developing an I/O test it is typical to add some logic to the
> test script, run it to view the output diff, and then apply the
> output diff to the reference file. This can be drastically simplified
> by letting the test runner update the reference file in place.
> 
> By setting 'QEMU_IOTESTS_REGEN=1', the test runner will report the
> failure and show the diff, but at the same time update the reference
> file. So next time the I/O test is run it will succeed.
> 
> Continuing to display the diff when updating the reference gives the
> developer a chance to review what was changed.
> 
> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
> ---
>  tests/qemu-iotests/testrunner.py | 6 ++++++
>  1 file changed, 6 insertions(+)

I like it - I've wished for similar when writing a test.

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
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