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