--- /dev/null
+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 org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field.Index;
+import org.apache.lucene.document.Field.Store;
+import org.apache.lucene.util.*;
+import org.apache.lucene.store.*;
+
+import org.junit.Test;
+
+import java.io.IOException;
+
+public class TestIsCurrent extends LuceneTestCase {
+
+ private RandomIndexWriter writer;
+
+ private Directory directory;
+
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+
+ // initialize directory
+ directory = newDirectory();
+ writer = new RandomIndexWriter(random, directory);
+
+ // write document
+ Document doc = new Document();
+ doc.add(newField("UUID", "1", Store.YES, Index.ANALYZED));
+ writer.addDocument(doc);
+ writer.commit();
+ }
+
+ @Override
+ public void tearDown() throws Exception {
+ super.tearDown();
+ writer.close();
+ directory.close();
+ }
+
+ /**
+ * Failing testcase showing the trouble
+ *
+ * @throws IOException
+ */
+ @Test
+ public void testDeleteByTermIsCurrent() throws IOException {
+
+ // get reader
+ IndexReader reader = writer.getReader();
+
+ // assert index has a document and reader is up2date
+ assertEquals("One document should be in the index", 1, writer.numDocs());
+ assertTrue("One document added, reader should be current", reader.isCurrent());
+
+ // remove document
+ Term idTerm = new Term("UUID", "1");
+ writer.deleteDocuments(idTerm);
+ writer.commit();
+
+ // assert document has been deleted (index changed), reader is stale
+ assertEquals("Document should be removed", 0, writer.numDocs());
+ assertFalse("Reader should be stale", reader.isCurrent());
+
+ reader.close();
+ }
+
+ /**
+ * Testcase for example to show that writer.deleteAll() is working as expected
+ *
+ * @throws IOException
+ */
+ @Test
+ public void testDeleteAllIsCurrent() throws IOException {
+
+ // get reader
+ IndexReader reader = writer.getReader();
+
+ // assert index has a document and reader is up2date
+ assertEquals("One document should be in the index", 1, writer.numDocs());
+ assertTrue("Document added, reader should be stale ", reader.isCurrent());
+
+ // remove all documents
+ writer.deleteAll();
+ writer.commit();
+
+ // assert document has been deleted (index changed), reader is stale
+ assertEquals("Document should be removed", 0, writer.numDocs());
+ assertFalse("Reader should be stale", reader.isCurrent());
+
+ reader.close();
+ }
+}