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Testing Transaction Report Merger Integration in CAT Monitoring System

This test suite validates the transaction report merging functionality in the CAT monitoring system. It focuses on verifying the correct combination of transaction reports from different time periods while maintaining data integrity and consistency.

Test Coverage Overview

The test suite provides comprehensive coverage of transaction report merging operations.

Key areas tested include:

XML parsing of old and new transaction reports
Merging logic validation
Data integrity verification after merge operations
Preservation of source report content

Implementation Analysis

The testing approach utilizes JUnit framework with XML-based test data fixtures. The implementation employs the Visitor pattern through the accept() method for report merging, demonstrating a clean separation of concerns between data structure and processing logic.

Technical patterns include:

SAX parsing for XML processing
Merger pattern for combining report data
Resource-based test data loading

Technical Details

Testing tools and components:

JUnit 4 testing framework
DefaultSaxParser for XML processing
Custom TestHelper for equality verification
File I/O utilities for test data loading
UTF-8 encoding for XML processing

Best Practices Demonstrated

The test suite exemplifies several testing best practices in Java development.

Notable practices include:

Isolated test data through resource files
Clear test method naming
Explicit assertion messages
Proper exception handling
Clean setup and verification structure

dianping/cat

cat-consumer/src/test/java/com/dianping/cat/consumer/transaction/TransactionReportMergerTest.java

            
/*
 * Copyright (c) 2011-2018, Meituan Dianping. All Rights Reserved.
 *
 * 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 com.dianping.cat.consumer.transaction;

import org.junit.Assert;
import org.junit.Test;
import org.unidal.helper.Files;

import com.dianping.cat.consumer.TestHelper;
import com.dianping.cat.consumer.transaction.model.entity.TransactionReport;
import com.dianping.cat.consumer.transaction.model.transform.DefaultSaxParser;

public class TransactionReportMergerTest {
	@Test
	public void testTransactionReportMerge() throws Exception {
		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("transaction_report_old.xml"), "utf-8");
		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("transaction_report_new.xml"), "utf-8");
		TransactionReport reportOld = DefaultSaxParser.parse(oldXml);
		TransactionReport reportNew = DefaultSaxParser.parse(newXml);
		String expected = Files.forIO()
								.readFrom(getClass().getResourceAsStream("transaction_report_mergeResult.xml"),	"utf-8");
		
		TransactionReport reportExpected = DefaultSaxParser.parse(expected);
		
		TransactionReportMerger merger = new TransactionReportMerger(new TransactionReport(reportOld.getDomain()));

		reportOld.accept(merger);
		reportNew.accept(merger);

		Assert.assertTrue("Check the merge result!",TestHelper.isEquals(reportExpected,merger.getTransactionReport()));
		
		//Assert.assertTrue("Source report is changed!", isEquals(newXml, reportNew.toString()));
	}
	
}