diff --git a/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/constant/PostgreSQLColumnTypeNameOidMappingsTest.java b/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/constant/PostgreSQLColumnTypeNameOidMappingsTest.java
new file mode 100644
index 0000000000000..1ff1a6677849a
--- /dev/null
+++ b/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/constant/PostgreSQLColumnTypeNameOidMappingsTest.java
@@ -0,0 +1,37 @@
+/*
+ * 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.shardingsphere.db.protocol.postgresql.constant;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class PostgreSQLColumnTypeNameOidMappingsTest {
+    
+    @Test
+    public void assertIntegerArrayGot() {
+        int columnTypeName = PostgreSQLColumnTypeNameOidMappings.getTypeOidByColumnTypeName("_int4");
+        assertEquals(1007, columnTypeName);
+    }
+    
+    @Test(expected = IllegalArgumentException.class)
+    public void assertIllegalArgExThrown() {
+        PostgreSQLColumnTypeNameOidMappings.getTypeOidByColumnTypeName("not_exist_type");
+    }
+    
+}
diff --git a/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/packet/command/query/PostgreSQLColumnDescriptionTest.java b/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/packet/command/query/PostgreSQLColumnDescriptionTest.java
new file mode 100644
index 0000000000000..d8ce85acc701e
--- /dev/null
+++ b/shardingsphere-db-protocol/shardingsphere-db-protocol-postgresql/src/test/java/org/apache/shardingsphere/db/protocol/postgresql/packet/command/query/PostgreSQLColumnDescriptionTest.java
@@ -0,0 +1,43 @@
+/*
+ * 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.shardingsphere.db.protocol.postgresql.packet.command.query;
+
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.Types;
+import org.junit.Assert;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+public class PostgreSQLColumnDescriptionTest {
+    
+    @Test
+    public void assertIntegerTypeOid() {
+        PostgreSQLColumnDescription description = new PostgreSQLColumnDescription("age", 1, Types.INTEGER, 4, null);
+        Assert.assertEquals(23, description.getTypeOID());
+    }
+    
+    @Test
+    public void assertIntegerArrayTypeOid() throws SQLException {
+        ResultSetMetaData resultSetMetaData = Mockito.mock(ResultSetMetaData.class);
+        Mockito.when(resultSetMetaData.getColumnTypeName(2)).thenReturn("_int4");
+        PostgreSQLColumnDescription description = new PostgreSQLColumnDescription("ages", 2, Types.ARRAY, 12, resultSetMetaData);
+        Assert.assertEquals(1007, description.getTypeOID());
+    }
+    
+}