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115 lines
4.8 KiB
ReStructuredText
115 lines
4.8 KiB
ReStructuredText
==========================================
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libvirt TCK : Technology Compatibility Kit
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==========================================
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.. contents::
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The libvirt TCK provides a framework for performing testing of the integration
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between libvirt drivers, the underlying virt hypervisor technology, related
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operating system services and system configuration. The idea (and name) is
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motivated by the Java TCK.
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In particular the libvirt TCK is intended to address the following scenarios:
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- Validate that a new libvirt driver is in compliance with the (possibly
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undocumented!) driver API semantics
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- Validate that an update to an existing driver does not change the API
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semantics in a non-compliant manner
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- Validate that a new hypervisor release is still providing compatibility with
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the corresponding libvirt driver usage
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- Validate that an OS distro deployment consisting of a hypervisor and libvirt
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release is configured correctly
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Thus the libvirt TCK will allow developers, administrators and users to
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determine the level of compatibility of their platform, and evaluate whether it
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will meet their needs, and get awareness of any regressions that may have
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occurred since a previous test run.
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Libvirt-TCK is maintained using `a GIT
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repository <https://gitlab.com/libvirt/libvirt-tck>`__. GitLab is also the place
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where the whole TCK development workflow (issues, merge requests, comments)
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happens.
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Using TCK
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---------
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TCK can be used independently of the environment, i.e. both on your local host
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or in a VM. We strongly recommend using a VM for the tests as TCK might affect
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your current host setup, see `Running TCK`_.
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Installing dependencies
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~~~~~~~~~~~~~~~~~~~~~~~
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Since TCK is based on libvirt Perl bindings, you'll need to have the proper
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version of the bindings installed for the version of libvirt you wish to test
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in order to be able execute the TCK test suite successfully. Additionally, a
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number of Perl dependencies will need to be installed as well, some will be
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available through the system package manager and some will likely need to be
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installed from CPAN (Perl's equivalent of Python's PyPI). Here's where
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`libvirt-ci's <https://gitlab.com/libvirt/libvirt-ci.git>`__ lcitool can help
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with preparing a test environment in a fresh VM, taking care of the
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dependencies along the way:
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::
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$ lcitool install --target fedora-36 tck-fedora36 --wait
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would get you a new Fedora 36 VM named ``tck-fedora36``. Then
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::
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$ lcitool update tck-fedora36 libvirt,libvirt-perl,libvirt-tck+runtime
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will install all the necessary dependencies to build libvirt, the corresponding
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Perl bindings and all TCK runtime dependencies to be able to execute the tests.
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We also recommend executing TCK using the Avocado framework as the test harness
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engine which means that you'll have to install Avocado in the test environment
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as well. You can get it either from
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`PyPI <https://pypi.org/project/avocado-framework/>`__ (recommended), or if
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you're on Fedora you can make use of the Avocado `module <https://avocado-framework.readthedocs.io/en/latest/guides/user/chapters/installing.html#installing-from-packages>`__.
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Using Avocado is not mandatory for the time being and you can skip it, but
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in the future we plan on making the TCK internal coupling with Avocado tighter.
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Running TCK
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~~~~~~~~~~~
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Once you have all the dependencies installed, you can then proceed with running
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as root the test suite as root (when running with Avocado):
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::
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# avocado --config avocado.config run --tap - ./scripts/
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from the TCK's git root.
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If you don't want to install Avocado you can execute tests using the
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``libvirt-tck`` binary directly (again, from the git root). You'll need to pass
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a few options that Avocado takes care of:
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::
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# PERL5LIB=./lib perl bin/libvirt-tck -c <path_to_config> --force ./scripts
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Running with the ``--force`` argument is not necessary and you can safely omit
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it, but it becomes useful if you need to interrupt a test run for some
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reason. In such case using ``--force`` ensures the first thing TCK does before
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running any tests is that it will clean up all resources from the previous test
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run which may have been left behind if you had interrupted the previous TCK's
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execution.
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Note that running with root privileges is necessary since some tests need
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access to system resources or configs. This, along with the fact that some
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tests might affect the host system are good reasons to consider using a test VM
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as described above.
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Contributing a test
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-------------------
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We'd appreciate if you provided a functional test case whenever you're adding a
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new feature or fixing a bug in libvirt with the only complication being that
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in case you're adding a new public API then a Perl binding will have to be
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introduced first. After that, the best way to start is looking at some existing
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tests, copy-pasting one that fits your scenario the best and tweak the
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remaining bits.
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