linux-kernel - [PATCH v2 5/6] kunit: kunit-test: Add test of logging only a newline

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Date:   Tue, 8 Aug 2023 13:35:28 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <brendan.higgins@...ux.dev>, <davidgow@...gle.com>,
        <rmoar@...gle.com>
CC:     <linux-kselftest@...r.kernel.org>, <kunit-dev@...glegroups.com>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH v2 5/6] kunit: kunit-test: Add test of logging only a newline

Add a test that logging a string containing only a newline appends
one newline to the log.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 lib/kunit/kunit-test.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index 621acdb5385e..ce80fb42128c 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -613,6 +613,12 @@ static void kunit_log_newline_test(struct kunit *test)
 		kunit_init_log_frag(frag);
 		list_add_tail(&frag->list, suite.log);
 
+		/* Log only a newline */
+		kunit_log_append(suite.log, "\n");
+		KUNIT_EXPECT_TRUE(test, list_is_singular(suite.log));
+		KUNIT_EXPECT_STREQ(test, frag->buf, "\n");
+		frag->buf[0] = '\0';
+
 		/* String that exactly fills fragment leaving no room for \n */
 		memset(frag->buf, 0, sizeof(frag->buf));
 		memset(frag->buf, 'x', sizeof(frag->buf) - 9);
-- 
2.30.2