diff --git a/test_helper.c b/test_helper.c
new file mode 100644
index 0000000..b3d9f60
--- /dev/null
+++ b/test_helper.c
@@ -0,0 +1,25 @@
+/* --------------------------------------------------------------
+* File          : test_helper.c
+* Authors       : Aoran Zeng <ccmywish@qq.com>
+* Created on    : <2023-08-30>
+* Last modified : <2023-08-30>
+*
+* test_helper:
+*
+*   测试 helper.h 中的辅助函数
+* -------------------------------------------------------------*/
+
+#include <stdio.h>
+#include "helper.h"
+
+int
+main (int argc, char const *argv[])
+{
+  xy_useutf8();
+  puts(xy_strjoin("中文输出",  "test"));
+  puts(xy_strjoin("中文输出2",  "test"));
+
+  xy_success("成功输出");
+  xy_warn("警告输出");
+  return 0;
+}