85 lines
2.6 KiB
ReStructuredText
85 lines
2.6 KiB
ReStructuredText
========================================
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QTest Device Emulation Testing Framework
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========================================
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QTest is a device emulation testing framework. It can be very useful to test
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device models; it could also control certain aspects of QEMU (such as virtual
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clock stepping), with a special purpose "qtest" protocol. Refer to
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:ref:`qtest-protocol` for more details of the protocol.
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QTest cases can be executed with
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.. code::
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make check-qtest
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The QTest library is implemented by ``tests/qtest/libqtest.c`` and the API is
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defined in ``tests/qtest/libqtest.h``.
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Consider adding a new QTest case when you are introducing a new virtual
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hardware, or extending one if you are adding functionalities to an existing
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virtual device.
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On top of libqtest, a higher level library, ``libqos``, was created to
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encapsulate common tasks of device drivers, such as memory management and
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communicating with system buses or devices. Many virtual device tests use
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libqos instead of directly calling into libqtest.
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Steps to add a new QTest case are:
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1. Create a new source file for the test. (More than one file can be added as
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necessary.) For example, ``tests/qtest/foo-test.c``.
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2. Write the test code with the glib and libqtest/libqos API. See also existing
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tests and the library headers for reference.
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3. Register the new test in ``tests/qtest/meson.build``. Add the test
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executable name to an appropriate ``qtests_*`` variable. There is
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one variable per architecture, plus ``qtests_generic`` for tests
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that can be run for all architectures. For example::
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qtests_generic = [
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...
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'foo-test',
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...
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]
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4. If the test has more than one source file or needs to be linked with any
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dependency other than ``qemuutil`` and ``qos``, list them in the ``qtests``
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dictionary. For example a test that needs to use the ``QIO`` library
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will have an entry like::
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{
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...
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'foo-test': [io],
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...
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}
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Debugging a QTest failure is slightly harder than the unit test because the
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tests look up QEMU program names in the environment variables, such as
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``QTEST_QEMU_BINARY`` and ``QTEST_QEMU_IMG``, and also because it is not easy
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to attach gdb to the QEMU process spawned from the test. But manual invoking
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and using gdb on the test is still simple to do: find out the actual command
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from the output of
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.. code::
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make check-qtest V=1
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which you can run manually.
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.. _qtest-protocol:
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QTest Protocol
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--------------
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.. kernel-doc:: softmmu/qtest.c
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:doc: QTest Protocol
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libqtest API reference
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----------------------
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.. kernel-doc:: tests/qtest/libqos/libqtest.h
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