Add test case for ResponsePacketBuilder (#7572)

* add test case for ResponsePacketBulder

* remove additional blank lines

shardingsphere-proxy/shardingsphere-proxy-frontend/shardingsphere-proxy-frontend-mysql/src/test/java/org/apache/shardingsphere/proxy/frontend/mysql/command/query/builder/ResponsePacketBuilderTest.java

@@ -0,0 +1,64 @@
+/*
+ * 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.proxy.frontend.mysql.command.query.builder;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Arrays;
+
+import org.apache.shardingsphere.db.protocol.packet.DatabasePacket;
+import org.apache.shardingsphere.proxy.backend.response.update.UpdateResponse;
+import org.apache.shardingsphere.db.protocol.mysql.packet.command.query.MySQLColumnDefinition41Packet;
+import org.apache.shardingsphere.db.protocol.mysql.packet.generic.MySQLOKPacket;
+import org.apache.shardingsphere.db.protocol.mysql.packet.generic.MySQLEofPacket;
+import org.apache.shardingsphere.db.protocol.mysql.packet.command.query.MySQLFieldCountPacket;
+import org.apache.shardingsphere.infra.executor.sql.raw.execute.result.query.QueryHeader;
+import org.apache.shardingsphere.proxy.backend.response.query.QueryResponse;
+
+import org.junit.Test;
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.hamcrest.CoreMatchers.anyOf;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+public final class ResponsePacketBuilderTest {
+
+    @Test
+    public void assertBuildQueryResponsePackets() {
+        QueryHeader queryHeader1 = new QueryHeader("schema1", "table1", "columnLabel1", "columnName1", 4, 5, 6, false, true, false, true);
+        QueryHeader queryHeader2 = new QueryHeader("schema2", "table2", "columnLabel2", "columnName2", 7, 8, 9, false, true, true, true);
+        List<QueryHeader> queryHeaders = Arrays.asList(new QueryHeader[]{queryHeader1, queryHeader2});
+        QueryResponse queryResponse = new QueryResponse(queryHeaders);
+        Collection<DatabasePacket<?>> actual = ResponsePacketBuilder.buildQueryResponsePackets(queryResponse);
+        assertThat(actual.stream().findAny().get(), anyOf(instanceOf(MySQLFieldCountPacket.class), instanceOf(MySQLColumnDefinition41Packet.class), instanceOf(MySQLEofPacket.class)));
+    }
+
+    @Test
+    public void assertBuildUpdateResponsePackets() {
+        UpdateResponse updateResponse = mock(UpdateResponse.class);
+        when(updateResponse.getUpdateCount()).thenReturn(10L);
+        when(updateResponse.getLastInsertId()).thenReturn(100L);
+        Collection<DatabasePacket<?>> actual = ResponsePacketBuilder.buildUpdateResponsePackets(updateResponse);
+        MySQLOKPacket actualItem = (MySQLOKPacket) actual.stream().findAny().get();
+        assertThat(actualItem, instanceOf(MySQLOKPacket.class));
+        assertThat(actualItem.getAffectedRows(), is(10L));
+        assertThat(actualItem.getLastInsertId(), is(100L));
+    }
+}