feat: support SSO

util/util_test.go

@@ -0,0 +1,22 @@
+package util
+
+import (
+	"testing"
+)
+
+func TestAppendStr(t *testing.T) {
+	strings := []string{"1", "2"}
+	str := AppendStr(strings, "1")
+	str = AppendStr(str, "3")
+	for i, s := range strings {
+		if s == "1" && i == 2 {
+			t.Errorf("AppendStr() = %v, want %v", str, []string{"1", "2"})
+		}
+
+	}
+	for i, s := range strings {
+		if i == 2 && s != "3" {
+			t.Errorf("AppendStr() = %v, want %v", str, []string{"1", "2", "3"})
+		}
+	}
+}