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// SPDX-License-Identifier: GPL-2.0-only
#include <kunit/test.h>
#include <linux/limits.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/string.h>
struct test_case_params {
unsigned long x;
unsigned long expected_result;
const char *name;
};
static const struct test_case_params params[] = {
{ 0, 0, "edge case: square root of 0" },
{ 1, 1, "perfect square: square root of 1" },
{ 2, 1, "non-perfect square: square root of 2" },
{ 3, 1, "non-perfect square: square root of 3" },
{ 4, 2, "perfect square: square root of 4" },
{ 5, 2, "non-perfect square: square root of 5" },
{ 6, 2, "non-perfect square: square root of 6" },
{ 7, 2, "non-perfect square: square root of 7" },
{ 8, 2, "non-perfect square: square root of 8" },
{ 9, 3, "perfect square: square root of 9" },
{ 15, 3, "non-perfect square: square root of 15 (N-1 from 16)" },
{ 16, 4, "perfect square: square root of 16" },
{ 17, 4, "non-perfect square: square root of 17 (N+1 from 16)" },
{ 80, 8, "non-perfect square: square root of 80 (N-1 from 81)" },
{ 81, 9, "perfect square: square root of 81" },
{ 82, 9, "non-perfect square: square root of 82 (N+1 from 81)" },
{ 255, 15, "non-perfect square: square root of 255 (N-1 from 256)" },
{ 256, 16, "perfect square: square root of 256" },
{ 257, 16, "non-perfect square: square root of 257 (N+1 from 256)" },
{ 2147483648, 46340, "large input: square root of 2147483648" },
{ 4294967295, 65535, "edge case: ULONG_MAX for 32-bit" },
};
static void get_desc(const struct test_case_params *tc, char *desc)
{
strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
}
KUNIT_ARRAY_PARAM(int_sqrt, params, get_desc);
static void int_sqrt_test(struct kunit *test)
{
const struct test_case_params *tc = (const struct test_case_params *)test->param_value;
KUNIT_EXPECT_EQ(test, tc->expected_result, int_sqrt(tc->x));
}
static struct kunit_case math_int_sqrt_test_cases[] = {
KUNIT_CASE_PARAM(int_sqrt_test, int_sqrt_gen_params),
{}
};
static struct kunit_suite int_sqrt_test_suite = {
.name = "math-int_sqrt",
.test_cases = math_int_sqrt_test_cases,
};
kunit_test_suites(&int_sqrt_test_suite);
MODULE_DESCRIPTION("math.int_sqrt KUnit test suite");
MODULE_LICENSE("GPL");
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