1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <kunit/test.h> 4 #include <linux/limits.h> 5 #include <linux/math.h> 6 #include <linux/module.h> 7 #include <linux/string.h> 8 9 struct test_case_params { 10 unsigned long x; 11 unsigned long expected_result; 12 const char *name; 13 }; 14 15 static const struct test_case_params params[] = { 16 { 0, 0, "edge case: square root of 0" }, 17 { 1, 1, "perfect square: square root of 1" }, 18 { 2, 1, "non-perfect square: square root of 2" }, 19 { 3, 1, "non-perfect square: square root of 3" }, 20 { 4, 2, "perfect square: square root of 4" }, 21 { 5, 2, "non-perfect square: square root of 5" }, 22 { 6, 2, "non-perfect square: square root of 6" }, 23 { 7, 2, "non-perfect square: square root of 7" }, 24 { 8, 2, "non-perfect square: square root of 8" }, 25 { 9, 3, "perfect square: square root of 9" }, 26 { 15, 3, "non-perfect square: square root of 15 (N-1 from 16)" }, 27 { 16, 4, "perfect square: square root of 16" }, 28 { 17, 4, "non-perfect square: square root of 17 (N+1 from 16)" }, 29 { 80, 8, "non-perfect square: square root of 80 (N-1 from 81)" }, 30 { 81, 9, "perfect square: square root of 81" }, 31 { 82, 9, "non-perfect square: square root of 82 (N+1 from 81)" }, 32 { 255, 15, "non-perfect square: square root of 255 (N-1 from 256)" }, 33 { 256, 16, "perfect square: square root of 256" }, 34 { 257, 16, "non-perfect square: square root of 257 (N+1 from 256)" }, 35 { 2147483648, 46340, "large input: square root of 2147483648" }, 36 { 4294967295, 65535, "edge case: ULONG_MAX for 32-bit" }, 37 }; 38 39 static void get_desc(const struct test_case_params *tc, char *desc) 40 { 41 strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE); 42 } 43 44 KUNIT_ARRAY_PARAM(int_sqrt, params, get_desc); 45 46 static void int_sqrt_test(struct kunit *test) 47 { 48 const struct test_case_params *tc = (const struct test_case_params *)test->param_value; 49 50 KUNIT_EXPECT_EQ(test, tc->expected_result, int_sqrt(tc->x)); 51 } 52 53 static struct kunit_case math_int_sqrt_test_cases[] = { 54 KUNIT_CASE_PARAM(int_sqrt_test, int_sqrt_gen_params), 55 {} 56 }; 57 58 static struct kunit_suite int_sqrt_test_suite = { 59 .name = "math-int_sqrt", 60 .test_cases = math_int_sqrt_test_cases, 61 }; 62 63 kunit_test_suites(&int_sqrt_test_suite); 64 65 MODULE_DESCRIPTION("math.int_sqrt KUnit test suite"); 66 MODULE_LICENSE("GPL"); 67