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Add a KUnit test suite for the gcd() function. This test suite verifies the correctness of gcd() across various scenarios, including edge cases. Signed-off-by: Yu-Chun Lin <eleanor15x@gmail.com> Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com> Link: https://lore.kernel.org/r/20250203075400.3431330-1-eleanor15x@gmail.com Signed-off-by: Kees Cook <kees@kernel.org>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <kunit/test.h>
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#include <linux/gcd.h>
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#include <linux/limits.h>
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struct test_case_params {
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unsigned long val1;
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unsigned long val2;
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unsigned long expected_result;
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const char *name;
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};
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static const struct test_case_params params[] = {
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{ 48, 18, 6, "GCD of 48 and 18" },
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{ 18, 48, 6, "GCD of 18 and 48" },
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{ 56, 98, 14, "GCD of 56 and 98" },
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{ 17, 13, 1, "Coprime numbers" },
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{ 101, 103, 1, "Coprime numbers" },
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{ 270, 192, 6, "GCD of 270 and 192" },
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{ 0, 5, 5, "GCD with zero" },
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{ 7, 0, 7, "GCD with zero reversed" },
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{ 36, 36, 36, "GCD of identical numbers" },
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{ ULONG_MAX, 1, 1, "GCD of max ulong and 1" },
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{ ULONG_MAX, ULONG_MAX, ULONG_MAX, "GCD of max ulong values" },
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};
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static void get_desc(const struct test_case_params *tc, char *desc)
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{
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strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
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}
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KUNIT_ARRAY_PARAM(gcd, params, get_desc);
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static void gcd_test(struct kunit *test)
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{
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const struct test_case_params *tc = (const struct test_case_params *)test->param_value;
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KUNIT_EXPECT_EQ(test, tc->expected_result, gcd(tc->val1, tc->val2));
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}
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static struct kunit_case math_gcd_test_cases[] = {
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KUNIT_CASE_PARAM(gcd_test, gcd_gen_params),
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{}
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};
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static struct kunit_suite gcd_test_suite = {
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.name = "math-gcd",
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.test_cases = math_gcd_test_cases,
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};
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kunit_test_suite(gcd_test_suite);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("math.gcd KUnit test suite");
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MODULE_AUTHOR("Yu-Chun Lin <eleanor15x@gmail.com>");
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