LanguageIdTest.java

/*
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 * 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
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 * distributed under the License is distributed on an "AS IS" BASIS,
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package org.apache.tika.eval.core.util;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;

import java.util.List;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Timeout;

import org.apache.tika.eval.core.langid.LanguageIDWrapper;
import org.apache.tika.language.detect.LanguageResult;

public class LanguageIdTest {
    @Test
    @Timeout(10000)
    public void testLongRepetitiveInput() throws Exception {
        //TIKA-2777 ��� originally tested OpenNLP regex defense.
        //Now verifies the bigram detector handles degenerate input quickly.
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < 50000; i++) {
            sb.append("a");
        }
        LanguageIDWrapper wrapper = new LanguageIDWrapper();
        List<LanguageResult> languages = wrapper.calculate(sb.toString());
        // The detector should return *something* without hanging;
        // the exact language for 50K repeated 'a' chars is not meaningful.
        assertNotNull(languages);
        assertFalse(languages.isEmpty());
    }
}