tests/commonlib/rational-test.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <commonlib/rational.h>
   4 #include <tests/test.h>
   5
   6 struct rational_test_param {
   7         unsigned long num, den;
   8         unsigned long max_num, max_den;
   9         unsigned long exp_num, exp_den;
  10 };
  11
  12 static const struct rational_test_param test_params[] = {
  13         /* Exceeds bounds, semi-convergent term > half last term */
  14         { 1230, 10,     100, 20,        100, 1},
  15         /* Exceeds bounds, semi-convergent term < half last term */
  16         { 34567, 100,   120, 20,        120, 1},
  17         /* Closest to zero */
  18         { 1, 30,        100, 10,        0, 1},
  19         /* Closest to smallest non-zero */
  20         { 1, 19,        100, 10,        1, 10},
  21         /* Exact answer */
  22         { 1155, 7735,   255, 255,       33, 221},
  23         /* Convergent */
  24         { 27, 32,       16, 16,         11, 13},
  25         /* Convergent, semiconvergent term half convergent term */
  26         { 67, 54,       17, 18,         5, 4},
  27         /* Semiconvergent, semiconvergent term half convergent term */
  28         { 453, 182,     60, 60,         57, 23},
  29         /* Semiconvergent, numerator limit */
  30         { 87, 32,       70, 32,         68, 25},
  31         /* Semiconvergent, demominator limit */
  32         { 14533, 4626,  15000, 2400,    7433, 2366},
  33 };
  34
  35 static void test_rational(void **state)
  36 {
  37         int i;
  38         unsigned long num = 0, den = 0;
  39
  40         for (i = 0; i < ARRAY_SIZE(test_params); i++) {
  41                 rational_best_approximation(test_params[i].num, test_params[i].den,
  42                                             test_params[i].max_num, test_params[i].max_den,
  43                                             &num, &den);
  44                 assert_int_equal(num, test_params[i].exp_num);
  45                 assert_int_equal(den, test_params[i].exp_den);
  46         }
  47 }
  48
  49 int main(void)
  50 {
  51         const struct CMUnitTest tests[] = {
  52                 cmocka_unit_test(test_rational),
  53         };
  54
  55         return cb_run_group_tests(tests, NULL, NULL);
  56 }
  57