[PATCH 3/3] list: test: Add a test for list_entry_is_head()

[David Gow]

The list_entry_is_head() macro was added[1] after the list KUnit tests,
so wasn't tested. Add a new KUnit test to complete the set.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e130816164e244b692921de49771eeb28205152d

Signed-off-by: David Gow <davidgow@xxxxxxxxxx>
---
 lib/list-test.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lib/list-test.c b/lib/list-test.c
index 7ce7eaebe060..4cd06a9fc73c 100644
--- a/lib/list-test.c
+++ b/lib/list-test.c
@@ -538,6 +538,18 @@ static void list_test_list_entry(struct kunit *test)
 				struct list_test_struct, list));
 }
 
+static void list_test_list_entry_is_head(struct kunit *test)
+{
+	struct list_test_struct test_struct1, test_struct2;
+	LIST_HEAD(list);
+
+	list_add_tail(&test_struct1.list, &list);
+	list_add_tail(&test_struct2.list, &list);
+
+	KUNIT_EXPECT_FALSE(test, list_entry_is_head((&test_struct1), &list, list));
+	KUNIT_EXPECT_FALSE(test, list_entry_is_head((&test_struct2), &list, list));
+}
+
 static void list_test_list_first_entry(struct kunit *test)
 {
 	struct list_test_struct test_struct1, test_struct2;
@@ -753,6 +765,7 @@ static struct kunit_case list_test_cases[] = {
 	KUNIT_CASE(list_test_list_splice_init),
 	KUNIT_CASE(list_test_list_splice_tail_init),
 	KUNIT_CASE(list_test_list_entry),
+	KUNIT_CASE(list_test_list_entry_is_head),
 	KUNIT_CASE(list_test_list_first_entry),
 	KUNIT_CASE(list_test_list_last_entry),
 	KUNIT_CASE(list_test_list_first_entry_or_null),
-- 
2.35.0.263.gb82422642f-goog