add unit test for cross report merger

cat-consumer-advanced/src/test/java/com/dianping/cat/consumer/cross/CrossReportMergerTest.java

+package com.dianping.cat.consumer.cross;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.unidal.webres.helper.Files;
+
+import com.dianping.cat.consumer.cross.model.entity.CrossReport;
+import com.dianping.cat.consumer.cross.model.transform.DefaultSaxParser;
+
+public class CrossReportMergerTest {
+	@Test
+	public void testCrossReportMerge() throws Exception {
+		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer.xml"), "utf-8");
+		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer.xml"), "utf-8");
+		CrossReport reportOld = DefaultSaxParser.parse(oldXml);
+		CrossReport reportNew = DefaultSaxParser.parse(newXml);
+		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("cross_analyzer_merger.xml"), "utf-8");
+		CrossReportMerger merger = new CrossReportMerger(new CrossReport(reportOld.getDomain()));
+
+		reportOld.accept(merger);
+		reportNew.accept(merger);
+
+		Assert.assertEquals("Check the merge result!", expected.replace("\r", ""), merger.getCrossReport().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/cross/cross_analyzer_merger.xml

+<?xml version="1.0" encoding="utf-8"?>
+<cross-report domain="group" startTime="2012-01-01 00:00:00" endTime="2012-01-01 00:59:59">
+   <domain>group</domain>
+   <ip>192.168.1.1</ip>
+   <local id="192.168.1.1">
+      <remote id="192.168.1.2" role="Pigeon.Client">
+         <type id="PigeonService" totalCount="100" failCount="100" failPercent="100.00" avg="100.00" sum="10000.00" tps="0.00">
+            <name id="Cat-Test-Service" totalCount="100" failCount="100" failPercent="100.00" avg="100.00" sum="10000.00" tps="0.00"/>
+         </type>
+      </remote>
+      <remote id="192.168.1.0:3000:class:method1" role="Pigeon.Server">
+         <type id="PigeonCall" totalCount="100" failCount="100" failPercent="100.00" avg="102.00" sum="10200.00" tps="0.00">
+            <name id="Cat-Test-Call" totalCount="100" failCount="100" failPercent="100.00" avg="102.00" sum="10200.00" tps="0.00"/>
+         </type>
+      </remote>
+   </local>
+</cross-report>