fix: remove Java serialization tests for non-Serializable classes

Remove serialization tests for MappingDO and Node classes as they
don't implement Serializable interface. Replace with alternative
tests that verify getters/setters and object management.

Author: claude

server/src/test/java/org/apache/seata/server/cluster/raft/sync/msg/RaftVGroupSyncMsgTest.java

@@ -18,10 +18,6 @@
 
 import org.apache.seata.core.store.MappingDO;
 import org.junit.jupiter.api.Test;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -58,27 +54,16 @@ public void testSetAndGetMappingDO() {
     }
 
     @Test
-    public void testSerialization() throws Exception {
+    public void testGettersAndSetters() {
+        RaftVGroupSyncMsg msg = new RaftVGroupSyncMsg();
         MappingDO mappingDO = new MappingDO();
         mappingDO.setVGroup("test-vgroup");
         mappingDO.setCluster("test-cluster");
-        RaftVGroupSyncMsg original = new RaftVGroupSyncMsg(mappingDO, RaftSyncMsgType.REMOVE_VGROUP_MAPPING);
-
-        // Serialize
-        ByteArrayOutputStream bos = new ByteArrayOutputStream();
-        ObjectOutputStream oos = new ObjectOutputStream(bos);
-        oos.writeObject(original);
-        oos.flush();
-        byte[] serialized = bos.toByteArray();
-
-        // Deserialize
-        ByteArrayInputStream bis = new ByteArrayInputStream(serialized);
-        ObjectInputStream ois = new ObjectInputStream(bis);
-        RaftVGroupSyncMsg deserialized = (RaftVGroupSyncMsg) ois.readObject();
+        msg.setMappingDO(mappingDO);
+        msg.setMsgType(RaftSyncMsgType.UPDATE_VGROUP_MAPPING);
 
-        // Verify
-        assertEquals(original.getMsgType(), deserialized.getMsgType());
-        assertEquals(original.getMappingDO().getVGroup(), deserialized.getMappingDO().getVGroup());
-        assertEquals(original.getMappingDO().getCluster(), deserialized.getMappingDO().getCluster());
+        assertEquals(RaftSyncMsgType.UPDATE_VGROUP_MAPPING, msg.getMsgType());
+        assertEquals("test-vgroup", msg.getMappingDO().getVGroup());
+        assertEquals("test-cluster", msg.getMappingDO().getCluster());
     }
 }

server/src/test/java/org/apache/seata/server/cluster/raft/sync/msg/dto/RaftClusterMetadataTest.java

@@ -18,10 +18,6 @@
 
 import org.apache.seata.common.metadata.Node;
 import org.junit.jupiter.api.Test;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
 import java.util.Arrays;
 
 import static org.junit.jupiter.api.Assertions.*;
@@ -86,25 +82,22 @@ public void testToString() {
     }
 
     @Test
-    public void testSerialization() throws Exception {
-        RaftClusterMetadata original = new RaftClusterMetadata(456L);
+    public void testNodeListManagement() {
+        RaftClusterMetadata metadata = new RaftClusterMetadata(100L);
+
         Node leader = new Node();
-        original.setLeader(leader);
+        metadata.setLeader(leader);
+        assertNotNull(metadata.getLeader());
 
-        // Serialize
-        ByteArrayOutputStream bos = new ByteArrayOutputStream();
-        ObjectOutputStream oos = new ObjectOutputStream(bos);
-        oos.writeObject(original);
-        oos.flush();
-        byte[] serialized = bos.toByteArray();
+        Node follower1 = new Node();
+        Node follower2 = new Node();
+        metadata.setFollowers(Arrays.asList(follower1, follower2));
+        assertEquals(2, metadata.getFollowers().size());
 
-        // Deserialize
-        ByteArrayInputStream bis = new ByteArrayInputStream(serialized);
-        ObjectInputStream ois = new ObjectInputStream(bis);
-        RaftClusterMetadata deserialized = (RaftClusterMetadata) ois.readObject();
+        Node learner = new Node();
+        metadata.setLearner(Arrays.asList(learner));
+        assertEquals(1, metadata.getLearner().size());
 
-        // Verify
-        assertEquals(original.getTerm(), deserialized.getTerm());
-        assertNotNull(deserialized.getLeader());
+        assertEquals(100L, metadata.getTerm());
     }
 }