实现多商户履约平台基础

backend/internal/service/secret_codec_test.go

@@ -0,0 +1,24 @@
+package service
+
+import "testing"
+
+func TestSecretCodecRoundTrip(t *testing.T) {
+	codec, err := NewSecretCodec("test-master-key")
+	if err != nil {
+		t.Fatalf("new codec: %v", err)
+	}
+	ciphertext, err := codec.Encrypt("plain-secret")
+	if err != nil {
+		t.Fatalf("encrypt: %v", err)
+	}
+	if ciphertext == "plain-secret" {
+		t.Fatalf("secret should not be stored as plaintext")
+	}
+	plain, err := codec.Decrypt(ciphertext)
+	if err != nil {
+		t.Fatalf("decrypt: %v", err)
+	}
+	if plain != "plain-secret" {
+		t.Fatalf("unexpected plaintext: %s", plain)
+	}
+}