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docs: Describe using images in writing iotests

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Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Fam Zheng 2018-07-24 16:47:38 +08:00 committed by Kevin Wolf
parent a1c81f4f16
commit f4a1b6536f
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docs/devel/testing.rst
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@ -255,6 +255,17 @@ comparable library support for invoking and interacting with QEMU programs. If
you opt for Python, it is strongly recommended to write Python 3 compatible
code.
Both Python and Bash frameworks in iotests provide helpers to manage test
images. They can be used to create and clean up images under the test
directory. If no I/O or any protocol specific feature is needed, it is often
more convenient to use the pseudo block driver, ``null-co://``, as the test
image, which doesn't require image creation or cleaning up. Avoid system-wide
devices or files whenever possible, such as ``/dev/null`` or ``/dev/zero``.
Otherwise, image locking implications have to be considered. For example,
another application on the host may have locked the file, possibly leading to a
test failure. If using such devices are explicitly desired, consider adding
``locking=off`` option to disable image locking.
Docker based tests
==================