Index: src/test/org/apache/lucene/index/TestLogByteMergePolicy.java
===================================================================
--- src/test/org/apache/lucene/index/TestLogByteMergePolicy.java	(revision 0)
+++ src/test/org/apache/lucene/index/TestLogByteMergePolicy.java	(revision 0)
@@ -0,0 +1,42 @@
+package org.apache.lucene.index;
+
+import java.io.File;
+
+import org.apache.lucene.analysis.WhitespaceAnalyzer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.FSDirectory;
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestLogByteMergePolicy extends LuceneTestCase {
+  public void test() throws Exception {
+    String tmpDir = System.getProperty("java.io.tmpdir");
+    File indexDir = new File(tmpDir, "logbyteindex");
+    indexDir.mkdirs();
+    Directory dir = FSDirectory.open(indexDir);
+    IndexWriter writer = new IndexWriter(dir, new WhitespaceAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
+    LogByteSizeMergePolicy mergePolicy = new LogByteSizeMergePolicy();
+    mergePolicy.setMaxMergeMB(2.0);
+    mergePolicy.setMinMergeMB(1.0);
+    writer.setMergePolicy(mergePolicy);
+    writer.setRAMBufferSizeMB(1.0);
+    int id = 0;
+    for (int y = 0; y < 50; y++) {
+      for (int x = 0; x < 1000; x++) {
+        Document document = TestIndexWriterReader.createDocument(id++, "index1", 20);
+        writer.addDocument(document);
+      }
+    }
+    writer.close();
+    long max = (long)(mergePolicy.getMaxMergeMB()*1024.*1024.);
+    SegmentInfos infos = new SegmentInfos();
+    infos.read(dir);
+    for (int x=0; x < infos.size(); x++) {
+      SegmentInfo info = infos.info(x);
+      long size = info.sizeInBytes();
+      System.out.println(info.name+" "+size);
+      assertTrue(size < max);
+    }
+    dir.close();
+  }
+}