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Testing Event Analysis Processing in CAT Monitoring System

This test suite validates the EventAnalyzer component in the CAT monitoring system, focusing on event message processing and report generation. It verifies the analyzer’s ability to process event messages and generate accurate event reports with proper timestamps and metrics.

Test Coverage Overview

The test suite provides comprehensive coverage of the EventAnalyzer functionality:

Message tree generation and processing for 1000 test cases
Event report generation and validation
Timestamp handling and message hierarchies
Success and error status handling
Integration with CAT’s message tree structure

Implementation Analysis

The testing approach implements a systematic verification of the event analysis pipeline:

Uses JUnit framework with ComponentTestCase extension
Implements setUp methods for analyzer initialization
Generates synthetic message trees with controlled test data
Validates report output against expected XML structure

Technical Details

Testing infrastructure includes:

JUnit 4 testing framework
Custom ComponentTestCase for dependency injection
DefaultMessageTree and DefaultTransaction implementations
XML-based report validation
Timestamp management for consistent testing

Best Practices Demonstrated

The test suite exemplifies several testing best practices:

Proper test setup and initialization
Systematic data generation for edge cases
XML-based expected result validation
Clear separation of test data generation and verification
Comprehensive assertion checks

dianping/cat

cat-consumer/src/test/java/com/dianping/cat/consumer/event/EventAnalyzerTest.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.event;

import java.text.SimpleDateFormat;
import java.util.Date;

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

import com.dianping.cat.Constants;
import com.dianping.cat.analysis.MessageAnalyzer;
import com.dianping.cat.consumer.TestHelper;
import com.dianping.cat.consumer.event.model.entity.EventReport;
import com.dianping.cat.message.Message;
import com.dianping.cat.message.internal.DefaultEvent;
import com.dianping.cat.message.internal.DefaultTransaction;
import com.dianping.cat.message.spi.DefaultMessageTree;
import com.dianping.cat.message.spi.MessageTree;

public class EventAnalyzerTest extends ComponentTestCase {

	private long m_timestamp;

	private EventAnalyzer m_analyzer;

	private String m_domain = "group";

	@Before
	public void setUp() throws Exception {
		super.setUp();
		long currentTimeMillis = System.currentTimeMillis();

		m_timestamp = currentTimeMillis - currentTimeMillis % (3600 * 1000);

		m_analyzer = (EventAnalyzer) lookup(MessageAnalyzer.class, EventAnalyzer.ID);
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd HH:mm");
		Date date = sdf.parse("20120101 00:00");

		m_analyzer.initialize(date.getTime(), Constants.HOUR, Constants.MINUTE * 5);
	}

	@Test
	public void testProcess() throws Exception {
		for (int i = 1; i <= 1000; i++) {
			MessageTree tree = ((DefaultMessageTree) generateMessageTree(i)).copyForTest();

			m_analyzer.process(tree);
		}

		EventReport report = m_analyzer.getReport(m_domain);

		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("event_analyzer.xml"), "utf-8");
		
		EventReport expected4report = com.dianping.cat.consumer.event.model.transform.DefaultSaxParser.parse(expected);
		
		Assert.assertTrue(TestHelper.isEquals(expected4report,report));
	}

	protected MessageTree generateMessageTree(int i) {
		MessageTree tree = new DefaultMessageTree();

		tree.setMessageId("" + i);
		tree.setDomain(m_domain);
		tree.setHostName("group001");
		tree.setIpAddress("192.168.1.1");

		DefaultTransaction t = new DefaultTransaction("A", "n" + i % 2);
		DefaultTransaction t2 = new DefaultTransaction("A-1", "n" + i % 3);

		if (i % 2 == 0) {
			t2.setStatus("ERROR");
		} else {
			t2.setStatus(Message.SUCCESS);
		}

		DefaultEvent event1 = new DefaultEvent("test2", "fail");
		event1.setTimestamp(m_timestamp + 5 * 60 * 1000);

		t2.addChild(event1);
		t2.complete();
		t2.setDurationInMillis(i);

		t.addChild(t2);

		if (i % 2 == 0) {
			t.setStatus("ERROR");
		} else {
			t.setStatus(Message.SUCCESS);
		}

		DefaultEvent event = new DefaultEvent("test1", "success");
		event.setTimestamp(m_timestamp + 5 * 60 * 1000);
		event.setStatus(Message.SUCCESS);
		t.addChild(event);

		t.complete();
		t.setDurationInMillis(i * 2);
		t.setTimestamp(m_timestamp + 1000);
		t2.setTimestamp(m_timestamp + 2000);
		tree.setMessage(t);

		return tree;
	}

}