lucene/analysis/common/src/test/org/apache/lucene/analysis/miscellaneous/TestRemoveDuplicatesTokenFilterFactory.java

/*
 * 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.BaseTokenStreamFactoryTestCase;
import org.apache.lucene.analysis.CannedTokenStream;
import org.apache.lucene.analysis.Token;
import org.apache.lucene.analysis.TokenStream;

/** Simple tests to ensure this factory is working */
public class TestRemoveDuplicatesTokenFilterFactory extends BaseTokenStreamFactoryTestCase {

  public static Token tok(int pos, String t, int start, int end) {
    Token tok = new Token(t, start, end);
    tok.setPositionIncrement(pos);
    return tok;
  }

  public void testDups(final String expected, final Token... tokens) throws Exception {
    TokenStream stream = new CannedTokenStream(tokens);
    stream = tokenFilterFactory("RemoveDuplicates").create(stream);
    assertTokenStreamContents(stream, expected.split("\\s"));
  }

  public void testSimpleDups() throws Exception {
    testDups(
        "A B C D E",
        tok(1, "A", 0, 4),
        tok(1, "B", 5, 10),
        tok(0, "B", 11, 15),
        tok(1, "C", 16, 20),
        tok(0, "D", 16, 20),
        tok(1, "E", 21, 25));
  }

  /** Test that bogus arguments result in exception */
  public void testBogusArguments() throws Exception {
    IllegalArgumentException expected =
        expectThrows(
            IllegalArgumentException.class,
            () -> {
              tokenFilterFactory("RemoveDuplicates", "bogusArg", "bogusValue");
            });
    assertTrue(expected.getMessage().contains("Unknown parameters"));
  }
}