diff --git a/test/xy.c b/test/xy.c
index 98ebc1b..cebba95 100644
--- a/test/xy.c
+++ b/test/xy.c
@@ -13,11 +13,17 @@
 #include "xy.h"
 
 void
-print_str (void *str)
+print_str_for_seq (void *str)
 {
   print ((char *) str);
 }
 
+void
+print_str_for_map (const char *key, void *value)
+{
+  println (xy_strcat (4, "  ", key, " => ", (char *) value));
+}
+
 
 int
 main (int argc, char const *argv[])
@@ -144,11 +150,23 @@ main (int argc, char const *argv[])
   xy_seq_push (seq, "World");
   assert_str ("Hello", xy_seq_at (seq, 1));
   assert_str ("World", xy_seq_at (seq, 2));
-  xy_seq_each (seq, print_str);
+  xy_seq_each (seq, print_str_for_seq); br();
   xy_seq_pop (seq);
   assert (1 == xy_seq_len (seq));
 
 
+  XyMap_t *map = xy_map_new ();
+  xy_map_set (map, "Hello", "World");
+  xy_map_set (map, "你好",  "世界");
+  assert_str ("World", xy_map_get (map, "Hello"));
+  assert_str ("世界", xy_map_get (map, "你好"));
+  xy_map_set (map, "Hello", "chsrc");
+  assert_str ("chsrc", xy_map_get (map, "Hello"));
+  assert (2 == xy_map_len (map));
+  echo ("{");
+    xy_map_each (map, print_str_for_map);
+  echo ("}");
+
   xy_succ ("测试完成", "xy.h 测试全部通过");
 
   // xy_unimplemented();