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1// SPDX-License-Identifier: GPL-2.02 3#include <kunit/test.h>4 5#include <linux/rational.h>6 7struct 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 15static 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 26static 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 */32KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc);33 34static 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 44static struct kunit_case rational_test_cases[] = {45 KUNIT_CASE_PARAM(rational_test, rational_gen_params),46 {}47};48 49static struct kunit_suite rational_test_suite = {50 .name = "rational",51 .test_cases = rational_test_cases,52};53 54kunit_test_suites(&rational_test_suite);55 56MODULE_DESCRIPTION("Rational fractions unit test");57MODULE_LICENSE("GPL v2");58