[PATCH v4 2/2] misc:minor basic kunit tests

[Vimal Agrawal]

basic kunit tests for misc minor

Signed-off-by: Vimal Agrawal <avimalin@xxxxxxxxx>
---
v2: Split from previous patch
v3:
v4: Match patch version for whole patch series

 lib/Kconfig.debug     | 11 +++++++
 lib/Makefile          |  1 +
 lib/test_misc_minor.c | 69 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 lib/test_misc_minor.c

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7315f643817a..5a5d27284e0a 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -2488,6 +2488,17 @@ config TEST_RHASHTABLE
 config TEST_IDA
 	tristate "Perform selftest on IDA functions"
 
+config TEST_MISC_MINOR
+	tristate "Basic misc minor Kunit test" if !KUNIT_ALL_TESTS
+	depends on KUNIT
+	default KUNIT_ALL_TESTS
+	help
+	  Kunit test for the misc minor.
+	  It tests misc minor functions for dynamic and misc dynamic minor.
+	  This include misc_xxx functions
+
+	  If unsure, say N.
+
 config TEST_PARMAN
 	tristate "Perform selftest on priority array manager"
 	depends on PARMAN
diff --git a/lib/Makefile b/lib/Makefile
index 773adf88af41..631d73f96f76 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_TEST_SYSCTL) += test_sysctl.o
 obj-$(CONFIG_TEST_IOV_ITER) += kunit_iov_iter.o
 obj-$(CONFIG_HASH_KUNIT_TEST) += test_hash.o
 obj-$(CONFIG_TEST_IDA) += test_ida.o
+obj-$(CONFIG_TEST_MISC_MINOR) += test_misc_minor.o
 obj-$(CONFIG_TEST_UBSAN) += test_ubsan.o
 CFLAGS_test_ubsan.o += $(call cc-disable-warning, vla)
 CFLAGS_test_ubsan.o += $(call cc-disable-warning, unused-but-set-variable)
diff --git a/lib/test_misc_minor.c b/lib/test_misc_minor.c
new file mode 100644
index 000000000000..293e0fb7e43e
--- /dev/null
+++ b/lib/test_misc_minor.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <kunit/test.h>
+#include <kunit/test-bug.h>
+#include <linux/module.h>
+#include <linux/miscdevice.h>
+
+/* dynamic minor (2) */
+static struct miscdevice dev_dynamic_minor = {
+	.minor  = 2,
+	.name   = "dev_dynamic_minor",
+};
+
+/* static minor (LCD_MINOR) */
+static struct miscdevice dev_static_minor = {
+	.minor  = LCD_MINOR,
+	.name   = "dev_static_minor",
+};
+
+/* misc dynamic minor */
+static struct miscdevice dev_misc_dynamic_minor = {
+	.minor  = MISC_DYNAMIC_MINOR,
+	.name   = "dev_misc_dynamic_minor",
+};
+
+static void kunit_dynamic_minor(struct kunit *test)
+{
+	int ret;
+
+	ret = misc_register(&dev_dynamic_minor);
+	KUNIT_EXPECT_EQ(test, 0, ret);
+	KUNIT_EXPECT_EQ(test, 2, dev_dynamic_minor.minor);
+	misc_deregister(&dev_dynamic_minor);
+}
+
+static void kunit_static_minor(struct kunit *test)
+{
+	int ret;
+
+	ret = misc_register(&dev_static_minor);
+	KUNIT_EXPECT_EQ(test, 0, ret);
+	KUNIT_EXPECT_EQ(test, LCD_MINOR, dev_static_minor.minor);
+	misc_deregister(&dev_static_minor);
+}
+
+static void kunit_misc_dynamic_minor(struct kunit *test)
+{
+	int ret;
+
+	ret = misc_register(&dev_misc_dynamic_minor);
+	KUNIT_EXPECT_EQ(test, 0, ret);
+	misc_deregister(&dev_misc_dynamic_minor);
+}
+
+static struct kunit_case test_cases[] = {
+	KUNIT_CASE(kunit_dynamic_minor),
+	KUNIT_CASE(kunit_static_minor),
+	KUNIT_CASE(kunit_misc_dynamic_minor),
+	{}
+};
+
+static struct kunit_suite test_suite = {
+	.name = "misc_minor_test",
+	.test_cases = test_cases,
+};
+kunit_test_suite(test_suite);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Vimal Agrawal");
+MODULE_DESCRIPTION("misc minor testing");
-- 
2.17.1