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Testing Event Trend Graph Generation in CAT Monitor

This test suite validates the EventTrendGraphBuilder functionality in the CAT monitoring system, focusing on graph data generation from event reports and data transformation accuracy.

Test Coverage Overview

The test suite provides comprehensive coverage of the EventTrendGraphBuilder’s core functionality, specifically focusing on event report data processing and visualization.

Tests event name-based data extraction and validation
Verifies type-based event report processing
Validates count and failure metrics accuracy
Covers XML parsing and data transformation

Implementation Analysis

The testing approach utilizes JUnit framework with a focus on precise data validation and XML processing.

Implements visitor pattern for report traversal
Uses XML file-based test data
Employs double precision comparison for metrics
Separates concerns between parsing and data processing

Technical Details

JUnit 4 testing framework
DefaultSaxParser for XML processing
Custom EventReportVisitor implementation
File I/O utilities for test data loading
Assert methods for double precision comparisons

Best Practices Demonstrated

The test suite exemplifies strong testing practices through careful organization and thorough validation approaches.

Separate test methods for different scenarios
Consistent assertion methodology
Resource-based test data management
Clear test method naming conventions
Proper exception handling

dianping/cat

cat-home/src/test/java/com/dianping/cat/report/page/event/EventTrendGraphBuilderTest.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.page.event;

import java.util.Map;

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

import com.dianping.cat.consumer.event.model.entity.EventReport;
import com.dianping.cat.consumer.event.model.transform.DefaultSaxParser;
import com.dianping.cat.report.page.event.transform.EventTrendGraphBuilder;
import com.dianping.cat.report.page.event.transform.EventTrendGraphBuilder.EventReportVisitor;

public class EventTrendGraphBuilderTest {

	@Test
	public void testVisitName() throws Exception {
		String xml = Files.forIO().readFrom(getClass().getResourceAsStream("EventReportDailyGraph.xml"),	"utf-8");
		EventReport report = DefaultSaxParser.parse(xml);

		EventReportVisitor visitor = new EventTrendGraphBuilder().new EventReportVisitor("10.1.77.193", "URL", "ClientInfo");
		visitor.visitEventReport(report);

		Map<String, double[]> datas = visitor.getDatas();
		assertArray(1725, datas.get(EventTrendGraphBuilder.COUNT));
		assertArray(0, datas.get(EventTrendGraphBuilder.FAIL));
	}

	@Test
	public void testVisitType() throws Exception {
		String xml = Files.forIO().readFrom(getClass().getResourceAsStream("EventReportDailyGraph.xml"),	"utf-8");
		EventReport report = DefaultSaxParser.parse(xml);

		EventReportVisitor visitor = new EventTrendGraphBuilder().new EventReportVisitor("10.1.77.193", "URL", "");
		visitor.visitEventReport(report);

		Map<String, double[]> datas = visitor.getDatas();
		assertArray(3450, datas.get(EventTrendGraphBuilder.COUNT));
		assertArray(0, datas.get(EventTrendGraphBuilder.FAIL));
	}

	public void assertArray(double expected, double[] real) {
		for (int i = 0; i < real.length; i++) {
			Assert.assertEquals(expected, real[i], 1e-6);
		}
	}

}