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diff --git a/lucene-java-3.5.0/lucene/src/test/org/apache/lucene/search/TestDocIdSet.java b/lucene-java-3.5.0/lucene/src/test/org/apache/lucene/search/TestDocIdSet.java
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+package org.apache.lucene.search;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+
+import junit.framework.Assert;
+
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field.Index;
+import org.apache.lucene.document.Field.Store;
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.index.RandomIndexWriter;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.LuceneTestCase;
+
+public class TestDocIdSet extends LuceneTestCase {
+  public void testFilteredDocIdSet() throws Exception {
+    final int maxdoc=10;
+    final DocIdSet innerSet = new DocIdSet() {
+
+        @Override
+        public DocIdSetIterator iterator() {
+          return new DocIdSetIterator() {
+
+            int docid = -1;
+            
+            @Override
+            public int docID() {
+              return docid;
+            }
+            
+            @Override
+            public int nextDoc() throws IOException {
+              docid++;
+              return docid < maxdoc ? docid : (docid = NO_MORE_DOCS);
+            }
+
+            @Override
+            public int advance(int target) throws IOException {
+              while (nextDoc() < target) {}
+              return docid;
+            }
+          };
+        } 
+      };
+	  
+		
+    DocIdSet filteredSet = new FilteredDocIdSet(innerSet){
+        @Override
+        protected boolean match(int docid) {
+          return docid%2 == 0;  //validate only even docids
+        }	
+      };
+	  
+    DocIdSetIterator iter = filteredSet.iterator();
+    ArrayList<Integer> list = new ArrayList<Integer>();
+    int doc = iter.advance(3);
+    if (doc != DocIdSetIterator.NO_MORE_DOCS) {
+      list.add(Integer.valueOf(doc));
+      while((doc = iter.nextDoc()) != DocIdSetIterator.NO_MORE_DOCS) {
+        list.add(Integer.valueOf(doc));
+      }
+    }
+	  
+    int[] docs = new int[list.size()];
+    int c=0;
+    Iterator<Integer> intIter = list.iterator();
+    while(intIter.hasNext()) {
+      docs[c++] = intIter.next().intValue();
+    }
+    int[] answer = new int[]{4,6,8};
+    boolean same = Arrays.equals(answer, docs);
+    if (!same) {
+      System.out.println("answer: " + Arrays.toString(answer));
+      System.out.println("gotten: " + Arrays.toString(docs));
+      fail();
+    }
+  }
+  
+  public void testNullDocIdSet() throws Exception {
+    // Tests that if a Filter produces a null DocIdSet, which is given to
+    // IndexSearcher, everything works fine. This came up in LUCENE-1754.
+    Directory dir = newDirectory();
+    RandomIndexWriter writer = new RandomIndexWriter(random, dir);
+    Document doc = new Document();
+    doc.add(newField("c", "val", Store.NO, Index.NOT_ANALYZED_NO_NORMS));
+    writer.addDocument(doc);
+    IndexReader reader = writer.getReader();
+    writer.close();
+    
+    // First verify the document is searchable.
+    IndexSearcher searcher = newSearcher(reader);
+    Assert.assertEquals(1, searcher.search(new MatchAllDocsQuery(), 10).totalHits);
+    
+    // Now search w/ a Filter which returns a null DocIdSet
+    Filter f = new Filter() {
+      @Override
+      public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
+        return null;
+      }
+    };
+    
+    Assert.assertEquals(0, searcher.search(new MatchAllDocsQuery(), f, 10).totalHits);
+    searcher.close();
+    reader.close();
+    dir.close();
+  }
+
+}