/*
 * 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.
 */
package org.apache.lucene.search.spell;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.store.ByteBuffersDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.tests.util.LuceneTestCase;

public class TestWordBreakMaxChangesZero extends LuceneTestCase {

  public void testMaxChangesZeroAllowsNoWordBreak() throws Exception {
    try (Directory dir = new ByteBuffersDirectory()) {
      try (IndexWriter w = new IndexWriter(dir, new IndexWriterConfig(null))) {
        Document doc = new Document();
        doc.add(new StringField("f", "a", Field.Store.NO));
        doc.add(new StringField("f", "b", Field.Store.NO));
        w.addDocument(doc);
      }
      try (DirectoryReader reader = DirectoryReader.open(dir)) {
        WordBreakSpellChecker wb = new WordBreakSpellChecker();
        wb.setMaxChanges(0);
        SuggestWord[][] breaks =
            wb.suggestWordBreaks(new Term("f", "ab"), 5, reader, SuggestMode.SUGGEST_ALWAYS, null);
        // setMaxChanges(0) = at most 0 word breaks: expected 0 suggestions, actual 1 ([a, b])
        assertEquals("suggestWordBreaks(ab) with maxChanges=0", 0, breaks.length);
      }
    }
  }
}