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Testing Heavy Report Merger Integration in dianping/cat

This test suite validates the merging functionality of Heavy Reports in the CAT monitoring system. It focuses on verifying XML parsing, report merging, and data integrity for heavy traffic analysis reports.

Test Coverage Overview

The test coverage encompasses critical aspects of the Heavy Report merging process:

XML parsing validation for old and new report formats
Report merger functionality verification
Data integrity checks during merge operations
String comparison with expected results

Implementation Analysis

The testing approach utilizes JUnit framework with ComponentTestCase extension for component testing. It implements a systematic verification process that includes XML file reading, parsing, and report merging operations.

The test employs the DefaultSaxParser for XML processing and HeavyReportMerger for combining report data.

Technical Details

Key technical components include:

JUnit 4 testing framework
Unidal ComponentTestCase for dependency injection
Files.forIO() utility for file operations
DefaultSaxParser for XML parsing
HeavyReportMerger for report consolidation

Best Practices Demonstrated

The test exemplifies several testing best practices:

Proper resource handling for test files
Clear assertion messages
Validation of both merged results and source data integrity
Platform-independent line ending handling
Structured test case organization

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/task/heavy/HeavyReportBuilderTest.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.
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package com.dianping.cat.report.task.heavy;

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

import com.dianping.cat.home.heavy.entity.HeavyReport;
import com.dianping.cat.home.heavy.transform.DefaultSaxParser;
import com.dianping.cat.report.page.statistics.task.heavy.HeavyReportMerger;

public class HeavyReportBuilderTest extends ComponentTestCase {

	@Test
	public void testMerge() throws Exception {
		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("old.xml"), "utf-8");
		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("new.xml"), "utf-8");
		HeavyReport reportOld = DefaultSaxParser.parse(oldXml);
		HeavyReport reportNew = DefaultSaxParser.parse(newXml);
		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("result.xml"), "utf-8");
		HeavyReportMerger merger = new HeavyReportMerger(new HeavyReport(reportOld.getDomain()));

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

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

	}
}