diff --git a/Makefile b/Makefile
index ffd0375..dc7aac6 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ all:
 	@gcc chsrc.c $(CFLAGS) -o $(TARGET)
 
 test:
-	@gcc test_helper.c -o $(TEST_TARGET)
+	@gcc test_xy.c -o $(TEST_TARGET)
 	@./$(TEST_TARGET)
 
 test_cmd: $(TARGET)
diff --git a/test_helper.c b/test_xy.c
similarity index 85%
rename from test_helper.c
rename to test_xy.c
index ad41bb0..d8c5c8e 100644
--- a/test_helper.c
+++ b/test_xy.c
@@ -1,16 +1,15 @@
 /* --------------------------------------------------------------
-* File          : test_helper.c
+* File          : test_xy.c
 * Authors       : Aoran Zeng <ccmywish@qq.com>
 * Created on    : <2023-08-30>
-* Last modified : <2023-09-02>
+* Last modified : <2023-09-03>
 *
-* test_helper:
+* test_xy:
 *
-*   测试 helper.h 中的辅助函数
+*   测试 xy.h
 * -------------------------------------------------------------*/
 
-#include <stdio.h>
-#include "helper.h"
+#include "xy.h"
 
 int
 main (int argc, char const *argv[])