Index: lucene/core/src/test/org/apache/lucene/index/TestTryDelete.java
===================================================================
--- lucene/core/src/test/org/apache/lucene/index/TestTryDelete.java	(revision 0)
+++ lucene/core/src/test/org/apache/lucene/index/TestTryDelete.java	(working copy)
@@ -0,0 +1,191 @@
+package org.apache.lucene.index;
+
+/*
+ * 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 org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field.Store;
+import org.apache.lucene.document.StringField;
+import org.apache.lucene.search.IndexSearcher;
+import org.apache.lucene.search.ReferenceManager;
+import org.apache.lucene.search.SearcherFactory;
+import org.apache.lucene.search.SearcherManager;
+import org.apache.lucene.search.TermQuery;
+import org.apache.lucene.search.TopDocs;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.RAMDirectory;
+import org.apache.lucene.util.LuceneTestCase;
+
+
+public class TestTryDelete extends LuceneTestCase
+{
+  private static IndexWriter getWriter (Directory directory)
+    throws IOException
+  {
+    LogMergePolicy policy = new LogByteSizeMergePolicy();
+    IndexWriterConfig conf = new IndexWriterConfig(TEST_VERSION_CURRENT,
+                                                   new MockAnalyzer(random()));
+    conf.setMergePolicy(policy);
+    conf.setOpenMode(OpenMode.CREATE_OR_APPEND);
+
+    IndexWriter writer = new IndexWriter(directory, conf);
+
+    return writer;
+  }
+
+  private static Directory createIndex ()
+    throws IOException
+  {
+    Directory directory = new RAMDirectory();
+
+    IndexWriter writer = getWriter(directory);
+
+    for (int i = 0; i < 10; i++) {
+      Document doc = new Document();
+      doc.add(new StringField("foo", String.valueOf(i), Store.YES));
+      writer.addDocument(doc);
+    }
+
+    writer.commit();
+    writer.close();
+
+    return directory;
+  }
+
+  public void testTryDeleteDocument ()
+    throws IOException
+  {
+    Directory directory = createIndex();
+
+    IndexWriter writer = getWriter(directory);
+
+    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
+                                                              true,
+                                                              new SearcherFactory());
+
+    TrackingIndexWriter mgrWriter = new TrackingIndexWriter(writer);
+
+    IndexSearcher searcher = mgr.acquire();
+
+    TopDocs topDocs = searcher.search(new TermQuery(new Term("foo", "0")),
+                                      100);
+    assertEquals(1, topDocs.totalHits);
+
+    long result = mgrWriter.tryDeleteDocument(DirectoryReader.open(writer,
+                                                                   true), 0);
+
+    assertEquals(1, result);
+
+    if (random().nextBoolean()) {
+      writer.commit();
+    }
+
+    assertTrue(writer.hasDeletions());
+    
+    mgr.maybeRefresh();
+
+    searcher = mgr.acquire();
+
+    topDocs = searcher.search(new TermQuery(new Term("foo", "0")), 100);
+
+    assertEquals(0, topDocs.totalHits);
+  }
+
+  public void testTryDeleteDocumentCloseAndReopen ()
+    throws IOException
+  {
+    Directory directory = createIndex();
+
+    IndexWriter writer = getWriter(directory);
+
+    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
+                                                              true,
+                                                              new SearcherFactory());
+
+    IndexSearcher searcher = mgr.acquire();
+
+    TopDocs topDocs = searcher.search(new TermQuery(new Term("foo", "0")),
+                                      100);
+    assertEquals(1, topDocs.totalHits);
+
+    TrackingIndexWriter mgrWriter = new TrackingIndexWriter(writer);
+    long result = mgrWriter.tryDeleteDocument(DirectoryReader.open(writer,
+                                                                   true), 0);
+
+    assertEquals(1, result);
+
+    writer.commit();
+
+    assertTrue(writer.hasDeletions());
+
+    mgr.maybeRefresh();
+
+    searcher = mgr.acquire();
+
+    topDocs = searcher.search(new TermQuery(new Term("foo", "0")), 100);
+
+    assertEquals(1, topDocs.totalHits);
+
+    writer.close();
+
+    searcher = new IndexSearcher(DirectoryReader.open(directory));
+
+    topDocs = searcher.search(new TermQuery(new Term("foo", "0")), 100);
+
+    assertEquals(0, topDocs.totalHits);
+
+  }
+
+  public void testDeleteDocuments ()
+    throws IOException
+  {
+    Directory directory = createIndex();
+
+    IndexWriter writer = getWriter(directory);
+
+    ReferenceManager<IndexSearcher> mgr = new SearcherManager(writer,
+                                                              true,
+                                                              new SearcherFactory());
+
+    IndexSearcher searcher = mgr.acquire();
+
+    TopDocs topDocs = searcher.search(new TermQuery(new Term("foo", "0")),
+                                      100);
+    assertEquals(1, topDocs.totalHits);
+
+    TrackingIndexWriter mgrWriter = new TrackingIndexWriter(writer);
+    long result = mgrWriter.deleteDocuments(new TermQuery(new Term("foo",
+                                                                   "0")));
+
+    assertEquals(1, result);
+
+    // writer.commit();
+
+    assertTrue(writer.hasDeletions());
+
+    mgr.maybeRefresh();
+
+    searcher = mgr.acquire();
+
+    topDocs = searcher.search(new TermQuery(new Term("foo", "0")), 100);
+
+    assertEquals(0, topDocs.totalHits);
+  }
+}

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