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b6c75c4a TP |
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 | ||
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 | ||
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"); |