diff --git a/lucene/core/src/test/org/apache/lucene/index/TestDuelingCodecs.java b/lucene/core/src/test/org/apache/lucene/index/TestDuelingCodecs.java
index 989eda6559a..ed04eb2f54e 100644
--- a/lucene/core/src/test/org/apache/lucene/index/TestDuelingCodecs.java
+++ b/lucene/core/src/test/org/apache/lucene/index/TestDuelingCodecs.java
@@ -22,6 +22,7 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Random;
 import java.util.Set;
+import java.util.TreeSet;
 
 import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.MockAnalyzer;
@@ -34,7 +35,6 @@ import org.apache.lucene.util.BytesRef;
 import org.apache.lucene.util.FixedBitSet;
 import org.apache.lucene.util.LineFileDocs;
 import org.apache.lucene.util.LuceneTestCase;
-import org.apache.lucene.util.ReaderUtil;
 import org.apache.lucene.util.automaton.AutomatonTestUtil;
 import org.apache.lucene.util.automaton.CompiledAutomaton;
 import org.apache.lucene.util.automaton.RegExp;
@@ -140,6 +140,7 @@ public class TestDuelingCodecs extends LuceneTestCase {
     assertTermVectors(leftReader, rightReader);
     assertDocValues(leftReader, rightReader);
     assertDeletedDocs(leftReader, rightReader);
+    assertFieldInfos(leftReader, rightReader);
   }
   
   /** 
@@ -614,6 +615,25 @@ public class TestDuelingCodecs extends LuceneTestCase {
     }
   }
   
+  public void assertFieldInfos(IndexReader leftReader, IndexReader rightReader) throws Exception {
+    FieldInfos leftInfos = MultiFields.getMergedFieldInfos(leftReader);
+    FieldInfos rightInfos = MultiFields.getMergedFieldInfos(rightReader);
+    
+    // TODO: would be great to verify more than just the names of the fields!
+    TreeSet<String> left = new TreeSet<String>();
+    TreeSet<String> right = new TreeSet<String>();
+    
+    for (FieldInfo fi : leftInfos) {
+      left.add(fi.name);
+    }
+    
+    for (FieldInfo fi : rightInfos) {
+      right.add(fi.name);
+    }
+    
+    assertEquals(info, left, right);
+  }
+  
   
   private static class RandomBits implements Bits {
     FixedBitSet bits;