[PATCH 09/30] smb/client: create netmisc_test.c and introduce DEFINE_CHECK_SORT_FUNC()

[chenxiaosong.chenxiaosong@linux.dev]

From: ChenXiaoSong <chenxiaosong@kylinos.cn>

We are going to define 4 functions to check the sort results, introduce the
macro DEFINE_CHECK_SORT_FUNC() to reduce duplicate code.

Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
---
 fs/smb/client/netmisc.c      |  4 ++++
 fs/smb/client/netmisc_test.c | 46 ++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)
 create mode 100644 fs/smb/client/netmisc_test.c

diff --git a/fs/smb/client/netmisc.c b/fs/smb/client/netmisc.c
index 54ede1db2c7f..32197a3a4e81 100644
--- a/fs/smb/client/netmisc.c
+++ b/fs/smb/client/netmisc.c
@@ -1056,3 +1056,7 @@ void smb_init_maperror(void)
 	sort(ntstatus_to_dos_map, ntstatus_to_dos_num,
 	     sizeof(struct ntstatus_to_dos), cmp_ntstatus_to_dos, NULL);
 }
+
+#if IS_ENABLED(CONFIG_SMB_KUNIT_TESTS)
+#include "netmisc_test.c"
+#endif /* CONFIG_SMB_KUNIT_TESTS */
diff --git a/fs/smb/client/netmisc_test.c b/fs/smb/client/netmisc_test.c
new file mode 100644
index 000000000000..f937b7b3d3f2
--- /dev/null
+++ b/fs/smb/client/netmisc_test.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: LGPL-2.1
+/*
+ *
+ *   KUnit tests of SMB1 maperror
+ *
+ *   Copyright (C) 2025 KylinSoft Co., Ltd. All rights reserved.
+ *   Author(s): ChenXiaoSong <chenxiaosong@kylinos.cn>
+ *
+ */
+
+#include <kunit/test.h>
+
+#define DEFINE_CHECK_SORT_FUNC(__array, __num, __field)			\
+static void __array ## _check_sort(struct kunit *test)			\
+{									\
+	bool is_sorted = true;						\
+	unsigned int i;							\
+									\
+	for (i = 1; i < __num; i++) {					\
+		if (__array[i].__field >= __array[i - 1].__field)	\
+			continue;					\
+									\
+		pr_err("%s array order is incorrect\n", #__array);	\
+		is_sorted = false;					\
+		break;							\
+	}								\
+									\
+	KUNIT_EXPECT_EQ(test, true, is_sorted);				\
+}
+
+/*
+ * Before running these test cases, the smb_init_maperror()
+ * function is called first.
+ */
+static struct kunit_case maperror_test_cases[] = {
+	{}
+};
+
+static struct kunit_suite maperror_suite = {
+	.name = "smb1_maperror",
+	.test_cases = maperror_test_cases,
+};
+
+kunit_test_suite(maperror_suite);
+
+MODULE_LICENSE("GPL");
-- 
2.43.0