1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 2
3 #include <kunit/test.h> 3 #include <kunit/test.h>
4 4
5 #include <linux/rational.h> 5 #include <linux/rational.h>
6 6
7 struct rational_test_param { 7 struct rational_test_param {
8 unsigned long num, den; 8 unsigned long num, den;
9 unsigned long max_num, max_den; 9 unsigned long max_num, max_den;
10 unsigned long exp_num, exp_den; 10 unsigned long exp_num, exp_den;
11 11
12 const char *name; 12 const char *name;
13 }; 13 };
14 14
15 static const struct rational_test_param test_p 15 static const struct rational_test_param test_parameters[] = {
16 { 1230, 10, 100, 20, 100, 1 16 { 1230, 10, 100, 20, 100, 1, "Exceeds bounds, semi-convergent term > 1/2 last term" },
17 { 34567,100, 120, 20, 120, 1 17 { 34567,100, 120, 20, 120, 1, "Exceeds bounds, semi-convergent term < 1/2 last term" },
18 { 1, 30, 100, 10, 0, 1, 18 { 1, 30, 100, 10, 0, 1, "Closest to zero" },
19 { 1, 19, 100, 10, 1, 10, 19 { 1, 19, 100, 10, 1, 10, "Closest to smallest non-zero" },
20 { 27,32, 16, 16, 11, 13 20 { 27,32, 16, 16, 11, 13, "Use convergent" },
21 { 1155, 7735, 255, 255, 33, 22 21 { 1155, 7735, 255, 255, 33, 221, "Exact answer" },
22 { 87, 32, 70, 32, 68, 25 22 { 87, 32, 70, 32, 68, 25, "Semiconvergent, numerator limit" },
23 { 14533, 4626, 15000, 2400, 7433, 23 { 14533, 4626, 15000, 2400, 7433, 2366, "Semiconvergent, denominator limit" },
24 }; 24 };
25 25
26 static void get_desc(const struct rational_tes 26 static void get_desc(const struct rational_test_param *param, char *desc)
27 { 27 {
28 strscpy(desc, param->name, KUNIT_PARAM 28 strscpy(desc, param->name, KUNIT_PARAM_DESC_SIZE);
29 } 29 }
30 30
31 /* Creates function rational_gen_params */ 31 /* Creates function rational_gen_params */
32 KUNIT_ARRAY_PARAM(rational, test_parameters, g 32 KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc);
33 33
34 static void rational_test(struct kunit *test) 34 static void rational_test(struct kunit *test)
35 { 35 {
36 const struct rational_test_param *para 36 const struct rational_test_param *param = (const struct rational_test_param *)test->param_value;
37 unsigned long n = 0, d = 0; 37 unsigned long n = 0, d = 0;
38 38
39 rational_best_approximation(param->num 39 rational_best_approximation(param->num, param->den, param->max_num, param->max_den, &n, &d);
40 KUNIT_EXPECT_EQ(test, n, param->exp_nu 40 KUNIT_EXPECT_EQ(test, n, param->exp_num);
41 KUNIT_EXPECT_EQ(test, d, param->exp_de 41 KUNIT_EXPECT_EQ(test, d, param->exp_den);
42 } 42 }
43 43
44 static struct kunit_case rational_test_cases[] 44 static struct kunit_case rational_test_cases[] = {
45 KUNIT_CASE_PARAM(rational_test, ration 45 KUNIT_CASE_PARAM(rational_test, rational_gen_params),
46 {} 46 {}
47 }; 47 };
48 48
49 static struct kunit_suite rational_test_suite 49 static struct kunit_suite rational_test_suite = {
50 .name = "rational", 50 .name = "rational",
51 .test_cases = rational_test_cases, 51 .test_cases = rational_test_cases,
52 }; 52 };
53 53
54 kunit_test_suites(&rational_test_suite); 54 kunit_test_suites(&rational_test_suite);
55 55
56 MODULE_DESCRIPTION("Rational fractions unit te 56 MODULE_DESCRIPTION("Rational fractions unit test");
57 MODULE_LICENSE("GPL v2"); 57 MODULE_LICENSE("GPL v2");
58 58
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