using Lucene.Net.Analysis;
using Lucene.Net.Index;
using Lucene.Net.Search.Spell;
using Lucene.Net.Store;
using Lucene.Net.Util;
using NUnit.Framework;
using System;

namespace Lucene.Net.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.
     */

    public class TestHighFrequencyDictionary : LuceneTestCase
    {
        [Test]
        public void TestEmpty()
        {
            Directory dir = NewDirectory();
            IndexWriter writer = new IndexWriter(dir, NewIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(Random)));
            writer.Commit();
            writer.Dispose();
            IndexReader ir = DirectoryReader.Open(dir);
            IDictionary dictionary = new HighFrequencyDictionary(ir, "bogus", 0.1f);
            IBytesRefEnumerator tf = dictionary.GetEntryEnumerator();
            assertNull(tf.Comparer);
            assertFalse(tf.MoveNext());
            dir.Dispose();
        }
    }
}
