1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <kunit/test.h> 4 5 #include <linux/rational.h> 6 7 struct rational_test_param { 8 unsigned long num, den; 9 unsigned long max_num, max_den; 10 unsigned long exp_num, exp_den; 11 12 const char *name; 13 }; 14 15 static const struct rational_test_param test_parameters[] = { 16 { 1230, 10, 100, 20, 100, 1, "Exceeds bounds, semi-convergent term > 1/2 last term" }, 17 { 34567,100, 120, 20, 120, 1, "Exceeds bounds, semi-convergent term < 1/2 last term" }, 18 { 1, 30, 100, 10, 0, 1, "Closest to zero" }, 19 { 1, 19, 100, 10, 1, 10, "Closest to smallest non-zero" }, 20 { 27,32, 16, 16, 11, 13, "Use convergent" }, 21 { 1155, 7735, 255, 255, 33, 221, "Exact answer" }, 22 { 87, 32, 70, 32, 68, 25, "Semiconvergent, numerator limit" }, 23 { 14533, 4626, 15000, 2400, 7433, 2366, "Semiconvergent, denominator limit" }, 24 }; 25 get_desc(const struct rational_test_param * param,char * desc)26 static void get_desc(const struct rational_test_param *param, char *desc) 27 { 28 strscpy(desc, param->name, KUNIT_PARAM_DESC_SIZE); 29 } 30 31 /* Creates function rational_gen_params */ 32 KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc); 33 rational_test(struct kunit * test)34 static void rational_test(struct kunit *test) 35 { 36 const struct rational_test_param *param = (const struct rational_test_param *)test->param_value; 37 unsigned long n = 0, d = 0; 38 39 rational_best_approximation(param->num, param->den, param->max_num, param->max_den, &n, &d); 40 KUNIT_EXPECT_EQ(test, n, param->exp_num); 41 KUNIT_EXPECT_EQ(test, d, param->exp_den); 42 } 43 44 static struct kunit_case rational_test_cases[] = { 45 KUNIT_CASE_PARAM(rational_test, rational_gen_params), 46 {} 47 }; 48 49 static struct kunit_suite rational_test_suite = { 50 .name = "rational", 51 .test_cases = rational_test_cases, 52 }; 53 54 kunit_test_suites(&rational_test_suite); 55 56 MODULE_LICENSE("GPL v2"); 57
