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As tests are added to kunit, it will become less feasible to execute
all built tests together. By supporting modular tests we provide
a simple way to do selective execution on a running system; specifying
CONFIG_KUNIT=y
CONFIG_KUNIT_EXAMPLE_TEST=m
...means we can simply "insmod example-test.ko" to run the tests.
To achieve this we need to do the following:
o export the required symbols in kunit
o string-stream tests utilize non-exported symbols so for now we skip
building them when CONFIG_KUNIT_TEST=m.
o drivers/base/power/qos-test.c contains a few unexported interface
references, namely freq_qos_read_value() and freq_constraints_init().
Both of these could be potentially defined as static inline functions
in include/linux/pm_qos.h, but for now we simply avoid supporting
module build for that test suite.
o support a new way of declaring test suites. Because a module cannot
do multiple late_initcall()s, we provide a kunit_test_suites() macro
to declare multiple suites within the same module at once.
o some test module names would have been too general ("test-test"
and "example-test" for kunit tests, "inode-test" for ext4 tests);
rename these as appropriate ("kunit-test", "kunit-example-test"
and "ext4-inode-test" respectively).
Also define kunit_test_suite() via kunit_test_suites()
as callers in other trees may need the old definition.
Co-developed-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Knut Omang <knut.omang@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Theodore Ts'o <tytso@mit.edu> # for ext4 bits
Acked-by: David Gow <davidgow@google.com> # For list-test
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Example KUnit test to show how to use KUnit.
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*
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* Copyright (C) 2019, Google LLC.
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* Author: Brendan Higgins <brendanhiggins@google.com>
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*/
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#include <kunit/test.h>
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/*
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* This is the most fundamental element of KUnit, the test case. A test case
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* makes a set EXPECTATIONs and ASSERTIONs about the behavior of some code; if
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* any expectations or assertions are not met, the test fails; otherwise, the
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* test passes.
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*
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* In KUnit, a test case is just a function with the signature
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* `void (*)(struct kunit *)`. `struct kunit` is a context object that stores
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* information about the current test.
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*/
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static void example_simple_test(struct kunit *test)
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{
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/*
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* This is an EXPECTATION; it is how KUnit tests things. When you want
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* to test a piece of code, you set some expectations about what the
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* code should do. KUnit then runs the test and verifies that the code's
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* behavior matched what was expected.
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*/
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KUNIT_EXPECT_EQ(test, 1 + 1, 2);
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}
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/*
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* This is run once before each test case, see the comment on
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* example_test_suite for more information.
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*/
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static int example_test_init(struct kunit *test)
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{
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kunit_info(test, "initializing\n");
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return 0;
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}
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/*
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* Here we make a list of all the test cases we want to add to the test suite
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* below.
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*/
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static struct kunit_case example_test_cases[] = {
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/*
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* This is a helper to create a test case object from a test case
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* function; its exact function is not important to understand how to
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* use KUnit, just know that this is how you associate test cases with a
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* test suite.
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*/
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KUNIT_CASE(example_simple_test),
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{}
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};
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/*
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* This defines a suite or grouping of tests.
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*
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* Test cases are defined as belonging to the suite by adding them to
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* `kunit_cases`.
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*
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* Often it is desirable to run some function which will set up things which
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* will be used by every test; this is accomplished with an `init` function
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* which runs before each test case is invoked. Similarly, an `exit` function
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* may be specified which runs after every test case and can be used to for
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* cleanup. For clarity, running tests in a test suite would behave as follows:
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*
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* suite.init(test);
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* suite.test_case[0](test);
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* suite.exit(test);
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* suite.init(test);
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* suite.test_case[1](test);
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* suite.exit(test);
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* ...;
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*/
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static struct kunit_suite example_test_suite = {
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.name = "example",
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.init = example_test_init,
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.test_cases = example_test_cases,
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};
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/*
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* This registers the above test suite telling KUnit that this is a suite of
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* tests that need to be run.
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*/
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kunit_test_suites(&example_test_suite);
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MODULE_LICENSE("GPL v2");
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