diff --git a/utils/safemap_test.go b/utils/safemap_test.go
index 1bfe8699..b3aa0896 100644
--- a/utils/safemap_test.go
+++ b/utils/safemap_test.go
@@ -31,6 +31,22 @@ func TestSet(t *testing.T) {
 	}
 }
 
+func TestReSet(t *testing.T) {
+	safeMap := NewBeeMap()
+	if ok := safeMap.Set("astaxie", 1); !ok {
+		t.Error("expected", true, "got", false)
+	}
+	// set diff value
+	if ok := safeMap.Set("astaxie", -1); !ok {
+		t.Error("expected", true, "got", false)
+	}
+
+	// set same value
+	if ok := safeMap.Set("astaxie", -1); ok {
+		t.Error("expected", false, "got", true)
+	}
+}
+
 func TestCheck(t *testing.T) {
 	if exists := safeMap.Check("astaxie"); !exists {
 		t.Error("expected", true, "got", false)
@@ -50,6 +66,21 @@ func TestDelete(t *testing.T) {
 	}
 }
 
+func TestItems(t *testing.T) {
+	safeMap := NewBeeMap()
+	safeMap.Set("astaxie", "hello")
+	for k, v := range safeMap.Items() {
+		key := k.(string)
+		value := v.(string)
+		if key != "astaxie" {
+			t.Error("expected the key should be astaxie")
+		}
+		if value != "hello" {
+			t.Error("expected the value should be hello")
+		}
+	}
+}
+
 func TestCount(t *testing.T) {
 	if count := safeMap.Count(); count != 0 {
 		t.Error("expected count to be", 0, "got", count)