package org.apache.lucene.search.suggest;

/**
 * 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.analysis.MockAnalyzer;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.spell.Dictionary;
import org.apache.lucene.search.spell.HighFrequencyDictionary;
import org.apache.lucene.search.spell.SortedIterator;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

public class TestHighFrequencyDictionary extends LuceneTestCase {
  public void testEmpty() throws Exception {
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    writer.commit();
    writer.close();
    IndexReader ir = DirectoryReader.open(dir);
    Dictionary dictionary = new HighFrequencyDictionary(ir, "bogus", 0.1f);
    SortedIterator tf = (SortedIterator)dictionary.getWordsIterator();
    tf.comparator();
    dir.close();
  }
}

package org.apache.lucene.search.suggest;

/**
 * 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.analysis.MockAnalyzer;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.search.spell.Dictionary;
import org.apache.lucene.search.spell.HighFrequencyDictionary;
import org.apache.lucene.search.spell.SortedIterator;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.BytesRefIterator;
import org.apache.lucene.util.LuceneTestCase;

public class TestHighFrequencyDictionary extends LuceneTestCase {
  public void testEmpty() throws Exception {
    Directory dir = newDirectory();
    IndexWriter writer = new IndexWriter(dir, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    writer.commit();
    writer.close();
    IndexReader ir = DirectoryReader.open(dir);
    Dictionary dictionary = new HighFrequencyDictionary(ir, "bogus", 0.1f);
    BytesRefIterator tf = dictionary.getWordsIterator();
    assertTrue(tf instanceof SortedIterator);
    ((SortedIterator)tf).comparator();
    assertNull(tf.next());
    dir.close();
  }
}

improve testEmpty to also check that the iterator is exhausted