add unit test for dependency report merger

cat-consumer-advanced/src/test/java/com/dianping/cat/consumer/dependency/DependencyReportMergerTest.java

+package com.dianping.cat.consumer.dependency;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.unidal.webres.helper.Files;
+
+import com.dianping.cat.consumer.dependency.model.entity.DependencyReport;
+import com.dianping.cat.consumer.dependency.model.transform.DefaultSaxParser;
+
+public class DependencyReportMergerTest {
+
+	@Test
+	public void testTopReportMerge() throws Exception {
+		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("dependency_analyzer.xml"), "utf-8");
+		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("dependency_analyzer.xml"), "utf-8");
+		DependencyReport reportOld = DefaultSaxParser.parse(oldXml);
+		DependencyReport reportNew = DefaultSaxParser.parse(newXml);
+		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("dependency_analyzer_merger.xml"), "utf-8");
+		DependencyReportMerger merger = new DependencyReportMerger(new DependencyReport(reportOld.getDomain()));
+
+		reportOld.accept(merger);
+		reportNew.accept(merger);
+
+		Assert.assertEquals("Check the merge result!", expected.replace("\r", ""), merger.getDependencyReport().toString()
+		      .replace("\r", ""));
+		Assert.assertEquals("Source report is changed!", newXml.replace("\r", ""), reportNew.toString().replace("\r", ""));
+	}
+}

cat-consumer-advanced/src/test/resources/com/dianping/cat/consumer/dependency/dependency_analyzer_merger.xml

+<?xml version="1.0" encoding="utf-8"?>
+<dependency-report domain="group" startTime="2012-01-01 00:00:00" endTime="2012-01-01 00:59:59">
+   <domainName>group</domainName>
+   <segment id="0">
+      <index name="PigeonService" total-count="68" error-count="68" sum="6868.00" avg="101.00"/>
+      <index name="Service" total-count="66" error-count="66" sum="6600.00" avg="100.00"/>
+      <index name="URL" total-count="66" error-count="66" sum="6732.00" avg="102.00"/>
+   </segment>
+   <segment id="5">
+      <index name="SQL" total-count="68" error-count="0" sum="3434.00" avg="50.50"/>
+      <index name="Cache.CatTest" total-count="66" error-count="0" sum="3300.00" avg="50.00"/>
+      <index name="Call" total-count="66" error-count="0" sum="3366.00" avg="51.00"/>
+      <dependency type="Cache" target="Cache.CatTest" total-count="66" avg="50.00" error-count="0" key="Cache:Cache.CatTest" sum="3300.00"/>
+      <dependency type="PigeonCall" target="Cat-CatTest" total-count="66" avg="51.00" error-count="0" key="PigeonCall:Cat-CatTest" sum="3366.00"/>
+   </segment>
+</dependency-report>