/*
 * 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.analysis.miscellaneous;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.tests.analysis.CannedTokenStream;
import org.apache.lucene.tests.analysis.Token;
import org.apache.lucene.tests.util.LuceneTestCase;
import org.apache.lucene.util.automaton.TooComplexToDeterminizeException;

public class TestConcatenateGraphMaxGraphExpansionsJavadoc extends LuceneTestCase {

  public void testMorePathsThanMaxGraphExpansions() throws Exception {
    TokenStream graph =
        new CannedTokenStream(
            new Token("a", 1, 0, 1), new Token("b", 0, 0, 1),
            new Token("c", 1, 2, 3), new Token("d", 0, 2, 3));
    try (TokenStream ts = new ConcatenateGraphFilter(graph, true, true, 3)) {
      ts.reset();
      // (a|b) (c|d) = 4 paths > 3: javadoc says TooComplexToDeterminizeException; actual: 3 tokens
      expectThrows(
          TooComplexToDeterminizeException.class,
          () -> {
            while (ts.incrementToken()) {}
          });
    }
  }
}