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-rw-r--r--lib/math/rational-test.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/lib/math/rational-test.c b/lib/math/rational-test.c
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+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/test.h>
+
+#include <linux/rational.h>
+
+struct rational_test_param {
+ unsigned long num, den;
+ unsigned long max_num, max_den;
+ unsigned long exp_num, exp_den;
+
+ const char *name;
+};
+
+static const struct rational_test_param test_parameters[] = {
+ { 1230, 10, 100, 20, 100, 1, "Exceeds bounds, semi-convergent term > 1/2 last term" },
+ { 34567,100, 120, 20, 120, 1, "Exceeds bounds, semi-convergent term < 1/2 last term" },
+ { 1, 30, 100, 10, 0, 1, "Closest to zero" },
+ { 1, 19, 100, 10, 1, 10, "Closest to smallest non-zero" },
+ { 27,32, 16, 16, 11, 13, "Use convergent" },
+ { 1155, 7735, 255, 255, 33, 221, "Exact answer" },
+ { 87, 32, 70, 32, 68, 25, "Semiconvergent, numerator limit" },
+ { 14533, 4626, 15000, 2400, 7433, 2366, "Semiconvergent, denominator limit" },
+};
+
+static void get_desc(const struct rational_test_param *param, char *desc)
+{
+ strscpy(desc, param->name, KUNIT_PARAM_DESC_SIZE);
+}
+
+/* Creates function rational_gen_params */
+KUNIT_ARRAY_PARAM(rational, test_parameters, get_desc);
+
+static void rational_test(struct kunit *test)
+{
+ const struct rational_test_param *param = (const struct rational_test_param *)test->param_value;
+ unsigned long n = 0, d = 0;
+
+ rational_best_approximation(param->num, param->den, param->max_num, param->max_den, &n, &d);
+ KUNIT_EXPECT_EQ(test, n, param->exp_num);
+ KUNIT_EXPECT_EQ(test, d, param->exp_den);
+}
+
+static struct kunit_case rational_test_cases[] = {
+ KUNIT_CASE_PARAM(rational_test, rational_gen_params),
+ {}
+};
+
+static struct kunit_suite rational_test_suite = {
+ .name = "rational",
+ .test_cases = rational_test_cases,
+};
+
+kunit_test_suites(&rational_test_suite);
+
+MODULE_LICENSE("GPL v2");