add demo of new utest cases

src/Kconfig

@@ -242,6 +242,8 @@ menuconfig RT_USING_DEBUG
     endif
 
 config RT_USING_CI_ACTION
+    bool "Enable CI Action build mode"
+    select RT_USING_UTEST
     default n
     help
         Identify that the environment is CI Action.

src/klibc/utest/SConscript

@@ -0,0 +1,10 @@
+from building import *
+
+src = []
+
+if GetDepend('RT_USING_CI_ACTION'):
+    src += Glob('utest_*.c')
+
+group = DefineGroup('utestcases', src, depend = [''])
+
+Return('group')

src/klibc/utest/tc_kstdlib.c

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2006-2019, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-12-21     Meco Man     the first version
+ */
+#include <rtklibc.h>
+#include <utest.h>
+
+static rt_err_t utest_tc_init(void)
+{
+    return RT_EOK;
+}
+
+static rt_err_t utest_tc_cleanup(void)
+{
+    return RT_EOK;
+}
+
+static void tc_rt_memcpy_1(void)
+{
+    const char src[] = "Hello, memcpy!";
+    char dest[20];
+    rt_memcpy(dest, src, sizeof(src));
+    uassert_true(rt_strcmp(src, dest) == 0);
+}
+
+static void utest_do_tc(void)
+{
+    UTEST_UNIT_RUN(tc_rt_memcpy_1);
+}
+
+UTEST_TC_EXPORT(utest_do_tc, "klibc.kstdlibc", utest_tc_init, utest_tc_cleanup, 1000);