/*
 * 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.suggest.fst;

import java.util.List;
import org.apache.lucene.tests.util.LuceneTestCase;
import org.apache.lucene.util.BytesRef;

public class TestFSTCompletionEmptyResult extends LuceneTestCase {

  public void testEmptyResultIsNotShared() throws Exception {
    FSTCompletionBuilder builder = new FSTCompletionBuilder();
    builder.add(new BytesRef("apple"), 1);
    FSTCompletion apple = builder.build();
    try {
      apple.lookup("", 1).addAll(apple.lookup("a", 1));
    } catch (UnsupportedOperationException _) {
    }
    // expected: another, empty FSTCompletion returns []; actual on main: [apple/1]
    assertEquals(List.of(), new FSTCompletionBuilder().build().lookup("", 1));
  }
}