add unit test for top report merger

cat-consumer/src/test/java/com/dianping/cat/consumer/top/TopReportMergerTest.java

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

cat-consumer/src/test/resources/com/dianping/cat/consumer/top/top_analyzer_merger.xml

+<?xml version="1.0" encoding="utf-8"?>
+<top-report domain="Cat" startTime="2012-01-01 00:00:00" endTime="2012-01-01 00:59:59">
+   <domain name="Cat">
+      <segment id="2" error="0" url="16" url-duration="10.00" service="60" service-duration="10.00" sql="38" sql-duration="10.00" call="54" call-duration="10.00" cache="0" cache-duration="0.00" url-error="4" url-sum="160.00" service-error="8" service-sum="600.00" sql-error="4" sql-sum="380.00" call-error="8" call-sum="540.00" cache-error="0" cache-sum="0.00">
+      </segment>
+   </domain>
+</top-report>