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