1// SPDX-License-Identifier: GPL-2.0-only
2
3#include <kunit/test.h>
4#include <linux/gcd.h>
5#include <linux/limits.h>
6
7struct test_case_params {
8 unsigned long val1;
9 unsigned long val2;
10 unsigned long expected_result;
11 const char *name;
12};
13
14static const struct test_case_params params[] = {
15 { 48, 18, 6, "GCD of 48 and 18" },
16 { 18, 48, 6, "GCD of 18 and 48" },
17 { 56, 98, 14, "GCD of 56 and 98" },
18 { 17, 13, 1, "Coprime numbers" },
19 { 101, 103, 1, "Coprime numbers" },
20 { 270, 192, 6, "GCD of 270 and 192" },
21 { 0, 5, 5, "GCD with zero" },
22 { 7, 0, 7, "GCD with zero reversed" },
23 { 36, 36, 36, "GCD of identical numbers" },
24 { ULONG_MAX, 1, 1, "GCD of max ulong and 1" },
25 { ULONG_MAX, ULONG_MAX, ULONG_MAX, "GCD of max ulong values" },
26};
27
28static void get_desc(const struct test_case_params *tc, char *desc)
29{
30 strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
31}
32
33KUNIT_ARRAY_PARAM(gcd, params, get_desc);
34
35static void gcd_test(struct kunit *test)
36{
37 const struct test_case_params *tc = (const struct test_case_params *)test->param_value;
38
39 KUNIT_EXPECT_EQ(test, tc->expected_result, gcd(tc->val1, tc->val2));
40}
41
42static struct kunit_case math_gcd_test_cases[] = {
43 KUNIT_CASE_PARAM(gcd_test, gcd_gen_params),
44 {}
45};
46
47static struct kunit_suite gcd_test_suite = {
48 .name = "math-gcd",
49 .test_cases = math_gcd_test_cases,
50};
51
52kunit_test_suite(gcd_test_suite);
53
54MODULE_LICENSE("GPL");
55MODULE_DESCRIPTION("math.gcd KUnit test suite");
56MODULE_AUTHOR("Yu-Chun Lin <eleanor15x@gmail.com>");
57

source code of linux/lib/math/tests/gcd_kunit.c