lib: Move KUnit tests into tests/ subdirectory

Following from the recent KUnit file naming discussion[1], move all
KUnit tests in lib/ into lib/tests/.

Link: https://lore.kernel.org/lkml/[email protected]/ [1]
Acked-by: Steven Rostedt (Google) <[email protected]>
Acked-by: Jakub Kicinski <[email protected]>
Acked-by: Masami Hiramatsu (Google) <[email protected]>
Reviewed-by: David Gow <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Reviewed-by: Rae Moar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Kees Cook <[email protected]>

1 files changed, 61 insertions, 0 deletions

diff --git a/lib/tests/test_sort.c b/lib/tests/test_sort.c
new file mode 100644
index 000000000000..cd4a338d1153
--- /dev/null
+++ b/lib/tests/test_sort.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <kunit/test.h>
+
+#include <linux/sort.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+/* a simple boot-time regression test */
+
+#define TEST_LEN 1000
+
+static int cmpint(const void *a, const void *b)
+{
+	return *(int *)a - *(int *)b;
+}
+
+static void test_sort(struct kunit *test)
+{
+	int *a, i, r = 1;
+
+	a = kunit_kmalloc_array(test, TEST_LEN, sizeof(*a), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, a);
+
+	for (i = 0; i < TEST_LEN; i++) {
+		r = (r * 725861) % 6599;
+		a[i] = r;
+	}
+
+	sort(a, TEST_LEN, sizeof(*a), cmpint, NULL);
+
+	for (i = 0; i < TEST_LEN - 1; i++)
+		KUNIT_ASSERT_LE(test, a[i], a[i + 1]);
+
+	r = 48;
+
+	for (i = 0; i < TEST_LEN - 1; i++) {
+		r = (r * 725861) % 6599;
+		a[i] = r;
+	}
+
+	sort(a, TEST_LEN - 1, sizeof(*a), cmpint, NULL);
+
+	for (i = 0; i < TEST_LEN - 2; i++)
+		KUNIT_ASSERT_LE(test, a[i], a[i + 1]);
+}
+
+static struct kunit_case sort_test_cases[] = {
+	KUNIT_CASE(test_sort),
+	{}
+};
+
+static struct kunit_suite sort_test_suite = {
+	.name = "lib_sort",
+	.test_cases = sort_test_cases,
+};
+
+kunit_test_suites(&sort_test_suite);
+
+MODULE_DESCRIPTION("sort() KUnit test suite");
+MODULE_LICENSE("GPL");