add unit test for mtrix report merger

cat-consumer-advanced/src/test/java/com/dianping/cat/consumer/matrix/MatrixReportMergerTest.java

+package com.dianping.cat.consumer.matrix;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.unidal.webres.helper.Files;
+
+import com.dianping.cat.consumer.matrix.model.entity.MatrixReport;
+import com.dianping.cat.consumer.matrix.model.transform.DefaultSaxParser;
+
+public class MatrixReportMergerTest {
+	@Test
+	public void testTopReportMerge() throws Exception {
+		String oldXml = Files.forIO().readFrom(getClass().getResourceAsStream("matrix_analyzer.xml"), "utf-8");
+		String newXml = Files.forIO().readFrom(getClass().getResourceAsStream("matrix_analyzer.xml"), "utf-8");
+		MatrixReport reportOld = DefaultSaxParser.parse(oldXml);
+		MatrixReport reportNew = DefaultSaxParser.parse(newXml);
+		String expected = Files.forIO().readFrom(getClass().getResourceAsStream("matrix_analyzer_merger.xml"), "utf-8");
+		MatrixReportMerger merger = new MatrixReportMerger(new MatrixReport(reportOld.getDomain()));
+
+		reportOld.accept(merger);
+		reportNew.accept(merger);
+
+		Assert.assertEquals("Check the merge result!", expected.replace("\r", ""), merger.getMatrixReport().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/matrix/matrix_analyzer_merger.xml

+<?xml version="1.0" encoding="utf-8"?>
+<matrix-report domain="group" startTime="2012-01-01 00:00:00" endTime="2012-01-01 00:59:59">
+   <domain>group</domain>
+   <matrix type="PigeonService" name="Cat-Test-Service" count="134" totalTime="13468000" url="1">
+      <ratio type="SQL" min="1" max="1" totalCount="68" totalTime="3434000" url="1"/>
+      <ratio type="Call" min="0" max="0" totalCount="0" totalTime="0"/>
+      <ratio type="Cache" min="0" max="1" totalCount="66" totalTime="3300000" url="2"/>
+   </matrix>
+   <matrix type="URL" name="Cat-Test-Call" count="66" totalTime="6732000" url="3">
+      <ratio type="SQL" min="0" max="0" totalCount="0" totalTime="0"/>
+      <ratio type="Call" min="1" max="1" totalCount="66" totalTime="3366000" url="3"/>
+      <ratio type="Cache" min="0" max="0" totalCount="0" totalTime="0"/>
+   </matrix>
+</matrix-report>