Payload registry test (#7885)

* add ConfigPublishGroupKeyParserTest

* PayloadRegistryTest

api/src/test/java/com/alibaba/nacos/api/remote/PayloadRegistryTest.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.alibaba.nacos.api.remote;
+
+import junit.framework.TestCase;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PayloadRegistryTest extends TestCase {
+
+    public void setUp() throws Exception {
+        super.setUp();
+    }
+
+    public void tearDown() throws Exception {
+    }
+
+    @Test
+    public void testInit() {
+        PayloadRegistry.init();
+        Assert.assertNotNull(PayloadRegistry.getClassByType("NotifySubscriberResponse"));
+        Assert.assertNotNull(PayloadRegistry.getClassByType("InstanceRequest"));
+    }
+}