Index: lucene/contrib/memory/src/java/org/apache/lucene/index/memory/MemoryIndex.java
===================================================================
--- lucene/contrib/memory/src/java/org/apache/lucene/index/memory/MemoryIndex.java	(revision 1302509)
+++ lucene/contrib/memory/src/java/org/apache/lucene/index/memory/MemoryIndex.java	(working copy)
@@ -514,7 +514,6 @@
   public String toString() {
     StringBuilder result = new StringBuilder(256);    
     sortFields();   
-    int sumBytes = 0;
     int sumPositions = 0;
     int sumTerms = 0;
     
@@ -525,7 +524,6 @@
       info.sortTerms();
       result.append(fieldName + ":\n");
       
-      int numBytes = 0;
       int numPositions = 0;
       for (int j=0; j < info.sortedTerms.length; j++) {
         Map.Entry<BytesRef,ArrayIntList> e = info.sortedTerms[j];
@@ -535,22 +533,20 @@
         result.append(positions.toString(stride)); // ignore offsets
         result.append("\n");
         numPositions += numPositions(positions);
-        numBytes += term.length;
       }
       
       result.append("\tterms=" + info.sortedTerms.length);
       result.append(", positions=" + numPositions);
-      result.append(", Kbytes=" + (numBytes/1000.0f));
+      result.append(", memory=" + RamUsageEstimator.humanReadableUnits(RamUsageEstimator.sizeOf(info)));
       result.append("\n");
       sumPositions += numPositions;
-      sumBytes += numBytes;
       sumTerms += info.sortedTerms.length;
     }
     
     result.append("\nfields=" + sortedFields.length);
     result.append(", terms=" + sumTerms);
     result.append(", positions=" + sumPositions);
-    result.append(", Kbytes=" + (sumBytes/1000.0f));
+    result.append(", memory=" + RamUsageEstimator.humanReadableUnits(getMemorySize()));
     return result.toString();
   }
   
Index: lucene/contrib/memory/src/test/org/apache/lucene/index/memory/MemoryIndexTest.java
===================================================================
--- lucene/contrib/memory/src/test/org/apache/lucene/index/memory/MemoryIndexTest.java	(revision 1302509)
+++ lucene/contrib/memory/src/test/org/apache/lucene/index/memory/MemoryIndexTest.java	(working copy)
@@ -52,7 +52,9 @@
 import org.apache.lucene.search.spans.SpanOrQuery;
 import org.apache.lucene.search.spans.SpanQuery;
 import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.RAMDirectory;
 import org.apache.lucene.util.BytesRef;
+import org.apache.lucene.util.RamUsageEstimator;
 import org.apache.lucene.util._TestUtil;
 
 /**
@@ -119,7 +121,7 @@
       termField.append(randomTerm());
     }
     
-    Directory ramdir = newDirectory();
+    Directory ramdir = new RAMDirectory();
     Analyzer analyzer = randomAnalyzer();
     IndexWriter writer = new IndexWriter(ramdir,
                                          new IndexWriterConfig(TEST_VERSION_CURRENT, analyzer).setCodec(_TestUtil.alwaysPostingsFormat(new Lucene40PostingsFormat())));
@@ -134,8 +136,18 @@
     MemoryIndex memory = new MemoryIndex();
     memory.addField("foo", fooField.toString(), analyzer);
     memory.addField("term", termField.toString(), analyzer);
+    
+    if (VERBOSE) {
+      System.out.println("Random MemoryIndex:\n" + memory.toString());
+      System.out.println("Same index as RAMDirectory: " +
+        RamUsageEstimator.humanReadableUnits(RamUsageEstimator.sizeOf(ramdir)));
+      System.out.println();
+    } else {
+      assertTrue(memory.getMemorySize() > 0L);
+    }
+
     assertAllQueries(memory, ramdir, analyzer);  
-    ramdir.close();
+    ramdir.close();    
   }
   
   /**