+ lib-math-rational-add-kunit-test-cases.patch added to -mm tree

+ lib-math-rational-add-kunit-test-cases.patch added to -mm tree

[akpm]

The patch titled
     Subject: lib/math/rational: add Kunit test cases
has been added to the -mm tree.  Its filename is
     lib-math-rational-add-kunit-test-cases.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/lib-math-rational-add-kunit-test-cases.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/lib-math-rational-add-kunit-test-cases.patch

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------------------------------------------------------
From: Trent Piepho <tpiepho@gmail.com>
Subject: lib/math/rational: add Kunit test cases

Adds a number of test cases that cover a range of possible code paths.

Link: https://lkml.kernel.org/r/20210525144250.214670-2-tpiepho@gmail.com
Signed-off-by: Trent Piepho <tpiepho@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Oskar Schirmer <oskar@scara.com>
Cc: Yiyuan Guo <yguoaz@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/Kconfig.debug        |   12 +++++++
 lib/math/Makefile        |    1 
 lib/math/rational-test.c |   56 +++++++++++++++++++++++++++++++++++++
 3 files changed, 69 insertions(+)

--- a/lib/Kconfig.debug~lib-math-rational-add-kunit-test-cases
+++ a/lib/Kconfig.debug
@@ -2447,6 +2447,18 @@ config SLUB_KUNIT_TEST
 
 	  If unsure, say N.
 
+config RATIONAL_KUNIT_TEST
+	tristate "KUnit test for rational.c" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	select RATIONAL
+	default KUNIT_ALL_TESTS
+	help
+	  This builds the rational math unit test.
+	  For more information on KUnit and unit tests in general please refer
+	  to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+	  If unsure, say N.
+
 config TEST_UDELAY
 	tristate "udelay test driver"
 	help
--- a/lib/math/Makefile~lib-math-rational-add-kunit-test-cases
+++ a/lib/math/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PRIME_NUMBERS)	+= prime_num
 obj-$(CONFIG_RATIONAL)		+= rational.o
 
 obj-$(CONFIG_TEST_DIV64)	+= test_div64.o
+obj-$(CONFIG_RATIONAL_KUNIT_TEST) += rational-test.o
--- /dev/null
+++ a/lib/math/rational-test.c
@@ -0,0 +1,56 @@
+// 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 > ½ last term" },
+	{ 34567,100, 	120, 20,	120, 1,    "Exceeds bounds, semi-convergent term < ½ 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, demominator 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");
_

Patches currently in -mm which might be from tpiepho@gmail.com are

lib-math-rationalc-fix-divide-by-zero.patch
lib-math-rational-add-kunit-test-cases.patch