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Testing Cross Report Merger Implementation in CAT Monitoring System

This test suite validates the merging functionality of Cross Reports in the CAT monitoring system. It ensures proper combination of cross-domain transaction data while maintaining data integrity and report structure.

Test Coverage Overview

The test suite provides comprehensive coverage of the CrossReportMerger functionality.

Key areas tested include:

XML parsing and report generation
Report merging accuracy
Data integrity preservation
Source report immutability

Implementation Analysis

The testing approach utilizes JUnit framework with XML-based test data validation.

Implementation highlights:

SAX parsing for XML processing
Visitor pattern implementation for report traversal
String comparison with whitespace normalization
Resource file based test data management

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
Custom SAX parser implementation
File I/O utilities for test data loading
UTF-8 encoding handling
Cross-platform line ending normalization

Best Practices Demonstrated

The test implementation showcases several testing best practices:

Isolated test data files
Explicit assertion messages
Input data validation
Source data immutability verification
Platform-independent comparison logic

dianping/cat

cat-consumer/src/test/java/com/dianping/cat/consumer/cross/CrossReportMergerTest.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.cross;

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

import com.dianping.cat.consumer.cross.model.entity.CrossReport;
import com.dianping.cat.consumer.cross.model.transform.DefaultSaxParser;

public class CrossReportMergerTest {
	@Test
	public void testCrossReportMerge() throws Exception {
		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer_old.xml"), "utf-8");
		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer_old.xml"), "utf-8");
		CrossReport reportOld = DefaultSaxParser.parse(oldXml);
		CrossReport reportNew = DefaultSaxParser.parse(newXml);
		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer_merger.xml"), "utf-8");
		CrossReportMerger merger = new CrossReportMerger(new CrossReport(reportOld.getDomain()));

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

		Assert.assertEquals("Check the merge result!", expected.replace("\r", ""),
								merger.getCrossReport().toString().replace("\r", ""));
		Assert.assertEquals("Source report is changed!", newXml.replace("\r", ""), reportNew.toString().replace("\r", ""));
	}
}