linux-kernel - [PATCH 10/12] kunit: uapi: Add example for UAPI tests

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Message-Id: <20250217-kunit-kselftests-v1-10-42b4524c3b0a@linutronix.de>
Date: Mon, 17 Feb 2025 11:59:30 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Andrew Morton <akpm@...ux-foundation.org>, Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Brendan Higgins <brendan.higgins@...ux.dev>, 
 David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, 
 Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
 linux-doc@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 10/12] kunit: uapi: Add example for UAPI tests

Extend the example to show how to run a userspace executable.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 lib/kunit/Makefile             |  8 +++++++-
 lib/kunit/kunit-example-test.c | 17 +++++++++++++++++
 lib/kunit/kunit-uapi-example.c | 20 ++++++++++++++++++++
 3 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
index 2b68f9bd20137edb705dcd8cb2dc145f9684cf73..0d89b666fcad12a542d3e2ffacedd26b122c5449 100644
--- a/lib/kunit/Makefile
+++ b/lib/kunit/Makefile
@@ -30,4 +30,10 @@ obj-$(CONFIG_KUNIT_TEST) +=		string-stream-test.o
 obj-$(CONFIG_KUNIT_TEST) +=		assert_test.o
 endif
 
-obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=	kunit-example-test.o
+userprogs +=				kunit-uapi-example
+kunit-uapi-example-userccflags :=	-static
+kunit-uapi-example-nolibc :=		$(CONFIG_ARCH_HAS_NOLIBC)
+blobs +=				kunit-uapi-example.blob.o
+obj-$(CONFIG_KUNIT_EXAMPLE_TEST) +=	kunit-example-test-mod.o
+kunit-example-test-mod-y +=		kunit-example-test.o
+kunit-example-test-mod-$(CONFIG_KUNIT_UAPI) += kunit-uapi-example.blob.o
diff --git a/lib/kunit/kunit-example-test.c b/lib/kunit/kunit-example-test.c
index 3056d6bc705d0a8f196f0f4412e679dbb0e03114..c5b8b308ed7b10c6ec4f475965205f2ccc4b4ec5 100644
--- a/lib/kunit/kunit-example-test.c
+++ b/lib/kunit/kunit-example-test.c
@@ -6,8 +6,11 @@
  * Author: Brendan Higgins <brendanhiggins@...gle.com>
  */
 
+#include <linux/blob.h>
+
 #include <kunit/test.h>
 #include <kunit/static_stub.h>
+#include <kunit/uapi.h>
 
 /*
  * This is the most fundamental element of KUnit, the test case. A test case
@@ -277,6 +280,19 @@ static void example_slow_test(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, 1 + 1, 2);
 }
 
+/*
+ * This test shows the usage of UAPI tests.
+ */
+static void example_uapi_test(struct kunit *test)
+{
+	DECLARE_BLOB(kunit_uapi_example);
+
+	if (IS_ENABLED(CONFIG_KUNIT_UAPI))
+		kunit_uapi_run_executable(test, &kunit_uapi_example);
+	else
+		kunit_skip(test, "CONFIG_KUNIT_UAPI not enabled");
+}
+
 /*
  * Here we make a list of all the test cases we want to add to the test suite
  * below.
@@ -297,6 +313,7 @@ static struct kunit_case example_test_cases[] = {
 	KUNIT_CASE(example_priv_test),
 	KUNIT_CASE_PARAM(example_params_test, example_gen_params),
 	KUNIT_CASE_SLOW(example_slow_test),
+	KUNIT_CASE(example_uapi_test),
 	{}
 };
 
diff --git a/lib/kunit/kunit-uapi-example.c b/lib/kunit/kunit-uapi-example.c
new file mode 100644
index 0000000000000000000000000000000000000000..4ec4b924f29b089cce9ca5b2b08a6ee0117b8ae9
--- /dev/null
+++ b/lib/kunit/kunit-uapi-example.c
@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit Userspace example test.
+ *
+ * Copyright (C) 2025, Linuxtronix GmbH.
+ * Author: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
+ */
+
+#include "../../tools/testing/selftests/kselftest.h"
+
+int main(void)
+{
+	ksft_print_header();
+	ksft_set_plan(4);
+	ksft_test_result_pass("userspace test 1\n");
+	ksft_test_result_pass("userspace test 2\n");
+	ksft_test_result_skip("userspace test 3: some reason\n");
+	ksft_test_result_pass("userspace test 4\n");
+	ksft_finished();
+}

-- 
2.48.1