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Testing Historical Transaction Report Merger Implementation in CAT

This test suite evaluates the functionality of transaction report merging in the CAT monitoring system. It focuses on validating the HistoryTransactionReportMerger’s ability to combine multiple transaction reports while maintaining data integrity and proper duration handling.

Test Coverage Overview

The test coverage focuses on merging historical transaction reports with specific attention to XML parsing and data combination.

Tests XML file reading and parsing functionality
Validates merger operations on TransactionReport objects
Verifies duration setting and handling
Ensures data consistency across merged reports

Implementation Analysis

The testing approach utilizes JUnit framework with XML-based test data fixtures. It implements a systematic verification process that includes parsing XML files, performing merger operations, and comparing expected vs actual results.

Uses DefaultSaxParser for XML processing
Implements HistoryTransactionReportMerger for combining reports
Employs TestHelper for result comparison

Technical Details

JUnit 4 testing framework
Files.forIO utility for file operations
UTF-8 encoding for XML processing
Custom TestHelper for equality comparison
SAX parsing for XML processing

Best Practices Demonstrated

The test implementation showcases several testing best practices for handling complex data transformations.

Resource-based test data management
Proper exception handling
Clean test setup and execution
Robust comparison mechanisms
Clear test method naming

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/task/transaction/HistoryTransactionMergerTest.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,
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 * See the License for the specific language governing permissions and
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package com.dianping.cat.report.task.transaction;

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

import com.dianping.cat.TestHelper;
import com.dianping.cat.consumer.transaction.model.entity.TransactionReport;
import com.dianping.cat.consumer.transaction.model.transform.DefaultSaxParser;
import com.dianping.cat.report.page.transaction.task.HistoryTransactionReportMerger;

public class HistoryTransactionMergerTest {

	@Test
	public void testMerge() throws Exception {
		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("HistoryTransaction.xml"), "utf-8");
		TransactionReport report1 = DefaultSaxParser.parse(oldXml);
		TransactionReport report2 = DefaultSaxParser.parse(oldXml);
		String expected = Files.forIO()
								.readFrom(getClass().getResourceAsStream("HistoryTransactionMergeResult.xml"),	"utf-8");
		HistoryTransactionReportMerger merger = new HistoryTransactionReportMerger(new TransactionReport(report1.getDomain()))
								.setDuration(2);

		report1.accept(merger);
		report2.accept(merger);

	//	Assert.assertEquals("Check the merge result!", expected.replace("\r", ""), actual.replace("\r", ""));

		Assert.assertTrue("Check the merge result!",TestHelper.isEquals(DefaultSaxParser.parse(expected),merger.getTransactionReport()));

	}
}