[PIR-10] add test for GroupList (apache#807)

common/src/test/java/org/apache/rocketmq/common/protocol/GroupListTest.java

@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.rocketmq.common.protocol;
+
+import org.apache.rocketmq.common.protocol.body.GroupList;
+import org.junit.Test;
+
+import java.util.HashSet;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Created by guoyao on 2019/2/18.
+ */
+public class GroupListTest {
+
+    @Test
+    public void testSetGet() throws Exception {
+        HashSet<String> fisrtUniqueSet=createUniqueNewSet();
+        HashSet<String> secondUniqueSet=createUniqueNewSet();
+        assertThat(fisrtUniqueSet).isNotEqualTo(secondUniqueSet);
+        GroupList gl=new GroupList();
+        gl.setGroupList(fisrtUniqueSet);
+        assertThat(gl.getGroupList()).isEqualTo(fisrtUniqueSet);
+        assertThat(gl.getGroupList()).isNotEqualTo(secondUniqueSet);
+        gl.setGroupList(secondUniqueSet);
+        assertThat(gl.getGroupList()).isNotEqualTo(fisrtUniqueSet);
+        assertThat(gl.getGroupList()).isEqualTo(secondUniqueSet);
+    }
+
+    private HashSet<String> createUniqueNewSet() {
+        HashSet<String> groups=new HashSet<String>();
+        groups.add(UUID.randomUUID().toString());
+        return groups;
+    }
+}