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lib/math/rational: add Kunit test cases

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Adds a number of test cases that cover a range of possible code paths.

[akpm@linux-foundation.org: remove non-ascii characters, fix whitespace]
[colin.king@canonical.com: fix spelling mistake "demominator" -> "denominator"]
  Link: https://lkml.kernel.org/r/20210526085049.6393-1-colin.king@canonical.com

Link: https://lkml.kernel.org/r/20210525144250.214670-2-tpiepho@gmail.com
Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Oskar Schirmer <oskar@scara.com>
Cc: Yiyuan Guo <yguoaz@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Trent Piepho 2021-06-30 18:55:52 -07:00 committed by Linus Torvalds
parent 65a0d3c146
commit b6c75c4afc
3 changed files with 69 additions and 0 deletions
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12
lib/Kconfig.debug
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@ -2444,6 +2444,18 @@ config SLUB_KUNIT_TEST
If unsure, say N.
config RATIONAL_KUNIT_TEST
tristate "KUnit test for rational.c" if !KUNIT_ALL_TESTS
depends on KUNIT
select RATIONAL
default KUNIT_ALL_TESTS
help
This builds the rational math unit test.
For more information on KUnit and unit tests in general please refer
to the KUnit documentation in Documentation/dev-tools/kunit/.
If unsure, say N.
config TEST_UDELAY
tristate "udelay test driver"
help

1
lib/math/Makefile
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@ -6,3 +6,4 @@ obj-$(CONFIG_PRIME_NUMBERS) += prime_numbers.o
obj-$(CONFIG_RATIONAL) += rational.o
obj-$(CONFIG_TEST_DIV64) += test_div64.o
obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational-test.o

56
lib/math/rational-test.c Normal file
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@ -0,0 +1,56 @@
// SPDX-License-Identifier: GPL-2.0
#include <kunit/test.h>
#include <linux/rational.h>
struct rational_test_param {
unsigned long num, den;
unsigned long max_num, max_den;
unsigned long exp_num, exp_den;
const char *name;
};
static const struct rational_test_param test_parameters[] = {
{ 1230, 10, 100, 20, 100, 1, "Exceeds bounds, semi-convergent term > 1/2 last term" },
{ 34567,100, 120, 20, 120, 1, "Exceeds bounds, semi-convergent term < 1/2 last term" },
{ 1, 30, 100, 10, 0, 1, "Closest to zero" },
{ 1, 19, 100, 10, 1, 10, "Closest to smallest non-zero" },
{ 27,32, 16, 16, 11, 13, "Use convergent" },
{ 1155, 7735, 255, 255, 33, 221, "Exact answer" },
{ 87, 32, 70, 32, 68, 25, "Semiconvergent, numerator limit" },
{ 14533, 4626, 15000, 2400, 7433, 2366, "Semiconvergent, denominator limit" },
};
static void get_desc(const struct rational_test_param *param, char *desc)
{
strscpy(desc, param->name, KUNIT_PARAM_DESC_SIZE);
}
/* Creates function rational_gen_params */
KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc);
static void rational_test(struct kunit *test)
{
const struct rational_test_param *param = (const struct rational_test_param *)test->param_value;
unsigned long n = 0, d = 0;
rational_best_approximation(param->num, param->den, param->max_num, param->max_den, &n, &d);
KUNIT_EXPECT_EQ(test, n, param->exp_num);
KUNIT_EXPECT_EQ(test, d, param->exp_den);
}
static struct kunit_case rational_test_cases[] = {
KUNIT_CASE_PARAM(rational_test, rational_gen_params),
{}
};
static struct kunit_suite rational_test_suite = {
.name = "rational",
.test_cases = rational_test_cases,
};
kunit_test_suites(&rational_test_suite);
MODULE_LICENSE("GPL v2");