181 lines
4.1 KiB
ReStructuredText
181 lines
4.1 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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===============
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Getting Started
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===============
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Installing dependencies
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=======================
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KUnit has the same dependencies as the Linux kernel. As long as you can build
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the kernel, you can run KUnit.
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KUnit Wrapper
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=============
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Included with KUnit is a simple Python wrapper that helps format the output to
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easily use and read KUnit output. It handles building and running the kernel, as
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well as formatting the output.
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The wrapper can be run with:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run --defconfig
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For more information on this wrapper (also called kunit_tool) checkout the
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:doc:`kunit-tool` page.
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Creating a .kunitconfig
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=======================
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The Python script is a thin wrapper around Kbuild. As such, it needs to be
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configured with a ``.kunitconfig`` file. This file essentially contains the
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regular Kernel config, with the specific test targets as well.
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.. code-block:: bash
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cd $PATH_TO_LINUX_REPO
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cp arch/um/configs/kunit_defconfig .kunitconfig
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Verifying KUnit Works
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---------------------
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To make sure that everything is set up correctly, simply invoke the Python
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wrapper from your kernel repo:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run
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.. note::
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You may want to run ``make mrproper`` first.
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If everything worked correctly, you should see the following:
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.. code-block:: bash
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Generating .config ...
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Building KUnit Kernel ...
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Starting KUnit Kernel ...
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followed by a list of tests that are run. All of them should be passing.
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.. note::
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Because it is building a lot of sources for the first time, the
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``Building KUnit kernel`` step may take a while.
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Writing your first test
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=======================
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In your kernel repo let's add some code that we can test. Create a file
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``drivers/misc/example.h`` with the contents:
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.. code-block:: c
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int misc_example_add(int left, int right);
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create a file ``drivers/misc/example.c``:
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.. code-block:: c
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#include <linux/errno.h>
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#include "example.h"
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int misc_example_add(int left, int right)
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{
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return left + right;
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}
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Now add the following lines to ``drivers/misc/Kconfig``:
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.. code-block:: kconfig
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config MISC_EXAMPLE
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bool "My example"
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and the following lines to ``drivers/misc/Makefile``:
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.. code-block:: make
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obj-$(CONFIG_MISC_EXAMPLE) += example.o
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Now we are ready to write the test. The test will be in
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``drivers/misc/example-test.c``:
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.. code-block:: c
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#include <kunit/test.h>
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#include "example.h"
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/* Define the test cases. */
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static void misc_example_add_test_basic(struct kunit *test)
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{
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KUNIT_EXPECT_EQ(test, 1, misc_example_add(1, 0));
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KUNIT_EXPECT_EQ(test, 2, misc_example_add(1, 1));
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KUNIT_EXPECT_EQ(test, 0, misc_example_add(-1, 1));
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KUNIT_EXPECT_EQ(test, INT_MAX, misc_example_add(0, INT_MAX));
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KUNIT_EXPECT_EQ(test, -1, misc_example_add(INT_MAX, INT_MIN));
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}
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static void misc_example_test_failure(struct kunit *test)
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{
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KUNIT_FAIL(test, "This test never passes.");
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}
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static struct kunit_case misc_example_test_cases[] = {
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KUNIT_CASE(misc_example_add_test_basic),
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KUNIT_CASE(misc_example_test_failure),
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{}
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};
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static struct kunit_suite misc_example_test_suite = {
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.name = "misc-example",
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.test_cases = misc_example_test_cases,
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};
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kunit_test_suite(misc_example_test_suite);
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Now add the following to ``drivers/misc/Kconfig``:
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.. code-block:: kconfig
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config MISC_EXAMPLE_TEST
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bool "Test for my example"
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depends on MISC_EXAMPLE && KUNIT
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and the following to ``drivers/misc/Makefile``:
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.. code-block:: make
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obj-$(CONFIG_MISC_EXAMPLE_TEST) += example-test.o
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Now add it to your ``.kunitconfig``:
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.. code-block:: none
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CONFIG_MISC_EXAMPLE=y
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CONFIG_MISC_EXAMPLE_TEST=y
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Now you can run the test:
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.. code-block:: bash
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./tools/testing/kunit/kunit.py run
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You should see the following failure:
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.. code-block:: none
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...
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[16:08:57] [PASSED] misc-example:misc_example_add_test_basic
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[16:08:57] [FAILED] misc-example:misc_example_test_failure
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[16:08:57] EXPECTATION FAILED at drivers/misc/example-test.c:17
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[16:08:57] This test never passes.
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...
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Congrats! You just wrote your first KUnit test!
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Next Steps
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==========
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* Check out the :doc:`usage` page for a more
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in-depth explanation of KUnit.
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