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Testing Event Graph Generation and Merging in CAT

The EventGraphCreatorTest suite validates the event report graph creation functionality in the CAT monitoring system, focusing on both hourly and daily graph generation and merging capabilities.

Test Coverage Overview

The test suite provides comprehensive coverage of event report graph creation functionality:

Hourly graph merging validation using BaseEventGraphReport
Daily graph merging across multiple report instances
XML parsing and transformation verification
Time-based report aggregation testing

Implementation Analysis

The testing approach employs JUnit framework with XML-based test data:

The implementation uses SAX parsing for XML processing and custom graph creators for both hourly (EventReportHourlyGraphCreator) and daily (EventReportDailyGraphCreator) report generation. The tests validate the correct merging of event data across different time periods.

Technical Details

Key technical components include:

JUnit 4 testing framework
DefaultSaxParser for XML processing
Custom TestHelper for equality assertions
SimpleDateFormat for timestamp handling
File I/O utilities for test data loading

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Separation of test data into external XML files
Clear test method naming conventions
Proper exception handling
Comprehensive assertion checking
Modular test organization with focused test methods

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/task/event/EventGraphCreatorTest.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
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 *    http://www.apache.org/licenses/LICENSE-2.0
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 * 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.event;

import java.text.SimpleDateFormat;

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

import com.dianping.cat.TestHelper;
import com.dianping.cat.consumer.event.model.entity.EventReport;
import com.dianping.cat.consumer.event.model.transform.DefaultSaxParser;
import com.dianping.cat.consumer.event.model.transform.DefaultXmlBuilder;
import com.dianping.cat.report.page.event.task.EventReportDailyGraphCreator;
import com.dianping.cat.report.page.event.task.EventReportHourlyGraphCreator;

public class EventGraphCreatorTest {

	@Test
	public void testMergeHourlyGraph() throws Exception {
		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("BaseEventGraphReport.xml"),	"utf-8");
		EventReport report1 = DefaultSaxParser.parse(oldXml);
		EventReport report2 = DefaultSaxParser.parse(oldXml);
		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("EventReportHourlyGraphResult.xml"), "utf-8");

		EventReport result = new EventReport(report1.getDomain());

		EventReportHourlyGraphCreator creator = new EventReportHourlyGraphCreator(result, 10);

		creator.createGraph(report1);
		creator.createGraph(report2);

		String actual = new DefaultXmlBuilder().buildXml(result);
		Assert.assertTrue("Check the merge result!",TestHelper.isEquals(DefaultSaxParser.parse(expected),DefaultSaxParser.parse(actual)));
		
	}

	@Test
	public void testMergeDailyGraph() throws Exception {
		String oldXml1 = Files.forIO().readFrom(getClass().getResourceAsStream("BaseDailyEventReport1.xml"),	"utf-8");
		String oldXml2 = Files.forIO().readFrom(getClass().getResourceAsStream("BaseDailyEventReport2.xml"),	"utf-8");

		EventReport report1 = DefaultSaxParser.parse(oldXml1);
		EventReport report2 = DefaultSaxParser.parse(oldXml2);
		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("EventReportDailyGraphResult.xml"), "utf-8");

		EventReport result = new EventReport(report1.getDomain());

		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		EventReportDailyGraphCreator creator = new EventReportDailyGraphCreator(result, 7, sdf.parse("2016-01-23 00:00:00"));

		creator.createGraph(report1);
		creator.createGraph(report2);

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