StemmerPatchTrieLoader.java

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/*******************************************************************************
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 * Copyright (C) 2026, Leo Galambos
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 *
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 * 3. Neither the name of the copyright holder nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 ******************************************************************************/
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package org.egothor.stemmer;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.Objects;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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 * Loader of patch-command tries from bundled stemmer dictionaries.
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 *
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 * <p>
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 * Each dictionary is line-oriented. The first token on a line is interpreted as
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 * the stem, and all following tokens are treated as known variants of that
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 * stem.
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 *
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 * <p>
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 * For each line, the loader inserts:
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 * <ul>
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 * <li>the stem itself mapped to the canonical no-op patch command
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 * {@link PatchCommandEncoder#NOOP_PATCH}, when requested by the caller</li>
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 * <li>every distinct variant mapped to the patch command transforming that
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 * variant to the stem</li>
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 * </ul>
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 *
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 * <p>
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 * Parsing is delegated to {@link StemmerDictionaryParser}, which also supports
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 * line remarks introduced by {@code #} or {@code //}.
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 */
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public final class StemmerPatchTrieLoader {
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    /**
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     * Logger of this class.
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     */
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    private static final Logger LOGGER = Logger.getLogger(StemmerPatchTrieLoader.class.getName());
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    /**
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     * Canonical no-op patch command used when the source and target are equal.
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     */
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    private static final String NOOP_PATCH_COMMAND = PatchCommandEncoder.NOOP_PATCH;
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    /**
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     * Utility class.
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     */
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    private StemmerPatchTrieLoader() {
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        throw new AssertionError("No instances.");
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    }
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    /**
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     * Supported bundled stemmer dictionaries.
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     */
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    public enum Language {
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        /**
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         * Danish.
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         */
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        DA_DK("da_dk"),
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        /**
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         * German.
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         */
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        DE_DE("de_de"),
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        /**
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         * Spanish.
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         */
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        ES_ES("es_es"),
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        /**
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         * French.
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         */
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        FR_FR("fr_fr"),
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        /**
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         * Italian.
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         */
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        IT_IT("it_it"),
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        /**
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         * Dutch.
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         */
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        NL_NL("nl_nl"),
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        /**
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         * Norwegian.
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         */
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        NO_NO("no_no"),
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        /**
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         * Portuguese.
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         */
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        PT_PT("pt_pt"),
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        /**
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         * Russian.
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         */
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        RU_RU("ru_ru"),
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        /**
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         * Swedish.
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         */
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        SV_SE("sv_se"),
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        /**
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         * English.
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         */
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        US_UK("us_uk"),
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        /**
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         * English professional dictionary.
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         */
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        US_UK_PROFI("us_uk.profi");
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        /**
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         * Resource directory name.
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         */
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        private final String resourceDirectory;
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        /**
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         * Creates a language constant.
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         *
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         * @param resourceDirectory resource directory name
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         */
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        Language(final String resourceDirectory) {
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            this.resourceDirectory = resourceDirectory;
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        }
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        /**
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         * Returns the classpath resource path of the stemmer dictionary.
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         *
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         * @return classpath resource path
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         */
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        public String resourcePath() {
169 1 1. resourcePath : replaced return value with "" for org/egothor/stemmer/StemmerPatchTrieLoader$Language::resourcePath → SURVIVED
 
            return this.resourceDirectory + "/stemmer";
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        }
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        /**
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         * Returns the resource directory name.
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         *
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         * @return resource directory name
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         */
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        public String resourceDirectory() {
178 1 1. resourceDirectory : replaced return value with "" for org/egothor/stemmer/StemmerPatchTrieLoader$Language::resourceDirectory → NO_COVERAGE
 
            return this.resourceDirectory;
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        }
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    }
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    /**
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     * Loads a bundled dictionary using explicit reduction settings.
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     *
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     * @param language          bundled language dictionary
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     * @param storeOriginal     whether the stem itself should be inserted using the
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     *                          canonical no-op patch command
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     * @param reductionSettings reduction settings
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the dictionary cannot be found or read
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     */
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    public static FrequencyTrie<String> load(final Language language, final boolean storeOriginal,
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            final ReductionSettings reductionSettings) throws IOException {
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        Objects.requireNonNull(language, "language");
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        Objects.requireNonNull(reductionSettings, "reductionSettings");
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        final String resourcePath = language.resourcePath();
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        try (InputStream inputStream = openBundledResource(resourcePath);
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                BufferedReader reader = new BufferedReader(
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                        new InputStreamReader(inputStream, StandardCharsets.UTF_8))) {
203 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
            return load(reader, resourcePath, storeOriginal, reductionSettings);
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        }
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    }
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    /**
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     * Loads a bundled dictionary using default settings for the supplied reduction
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     * mode.
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     *
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     * @param language      bundled language dictionary
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     * @param storeOriginal whether the stem itself should be inserted using the
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     *                      canonical no-op patch command
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     * @param reductionMode reduction mode
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the dictionary cannot be found or read
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     */
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    public static FrequencyTrie<String> load(final Language language, final boolean storeOriginal,
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            final ReductionMode reductionMode) throws IOException {
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        Objects.requireNonNull(reductionMode, "reductionMode");
222 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
        return load(language, storeOriginal, ReductionSettings.withDefaults(reductionMode));
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    }
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    /**
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     * Loads a dictionary from a filesystem path using explicit reduction settings.
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     *
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     * @param path              path to the dictionary file
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     * @param storeOriginal     whether the stem itself should be inserted using the
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     *                          canonical no-op patch command
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     * @param reductionSettings reduction settings
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the file cannot be opened or read
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     */
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    public static FrequencyTrie<String> load(final Path path, final boolean storeOriginal,
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            final ReductionSettings reductionSettings) throws IOException {
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        Objects.requireNonNull(path, "path");
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        Objects.requireNonNull(reductionSettings, "reductionSettings");
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        try (BufferedReader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8)) {
242 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
            return load(reader, path.toAbsolutePath().toString(), storeOriginal, reductionSettings);
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        }
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    }
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    /**
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     * Loads a dictionary from a filesystem path using default settings for the
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     * supplied reduction mode.
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     *
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     * @param path          path to the dictionary file
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     * @param storeOriginal whether the stem itself should be inserted using the
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     *                      canonical no-op patch command
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     * @param reductionMode reduction mode
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the file cannot be opened or read
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     */
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    public static FrequencyTrie<String> load(final Path path, final boolean storeOriginal,
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            final ReductionMode reductionMode) throws IOException {
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        Objects.requireNonNull(reductionMode, "reductionMode");
261 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
        return load(path, storeOriginal, ReductionSettings.withDefaults(reductionMode));
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    }
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    /**
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     * Loads a dictionary from a filesystem path string using explicit reduction
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     * settings.
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     *
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     * @param fileName          file name or path string
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     * @param storeOriginal     whether the stem itself should be inserted using the
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     *                          canonical no-op patch command
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     * @param reductionSettings reduction settings
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the file cannot be opened or read
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     */
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    public static FrequencyTrie<String> load(final String fileName, final boolean storeOriginal,
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            final ReductionSettings reductionSettings) throws IOException {
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        Objects.requireNonNull(fileName, "fileName");
279 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
        return load(Path.of(fileName), storeOriginal, reductionSettings);
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    }
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    /**
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     * Loads a dictionary from a filesystem path string using default settings for
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     * the supplied reduction mode.
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     *
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     * @param fileName      file name or path string
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     * @param storeOriginal whether the stem itself should be inserted using the
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     *                      canonical no-op patch command
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     * @param reductionMode reduction mode
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     * @return compiled patch-command trie
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if the file cannot be opened or read
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     */
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    public static FrequencyTrie<String> load(final String fileName, final boolean storeOriginal,
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            final ReductionMode reductionMode) throws IOException {
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        Objects.requireNonNull(fileName, "fileName");
297 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
        return load(Path.of(fileName), storeOriginal, reductionMode);
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    }
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    /**
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     * Parses one dictionary and builds the compiled trie.
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     *
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     * @param reader            dictionary reader
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     * @param sourceDescription logical source description used for diagnostics
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     * @param storeOriginal     whether the stem itself should be inserted using the
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     *                          canonical no-op patch command
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     * @param reductionSettings reduction settings
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     * @return compiled patch-command trie
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     * @throws IOException if parsing fails
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     */
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    private static FrequencyTrie<String> load(final BufferedReader reader, final String sourceDescription,
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            final boolean storeOriginal, final ReductionSettings reductionSettings) throws IOException {
313 1 1. lambda$load$0 : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::lambda$load$0 → KILLED
 
        final FrequencyTrie.Builder<String> builder = new FrequencyTrie.Builder<>(String[]::new, reductionSettings);
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        final PatchCommandEncoder patchCommandEncoder = new PatchCommandEncoder();
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        final int[] insertedMappings = new int[1];
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        final StemmerDictionaryParser.ParseStatistics statistics = StemmerDictionaryParser.parse(reader,
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                sourceDescription, (stem, variants, lineNumber) -> {
319 1 1. lambda$load$1 : negated conditional → KILLED
 
                    if (storeOriginal) {
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                        builder.put(stem, NOOP_PATCH_COMMAND);
321 1 1. lambda$load$1 : Replaced integer addition with subtraction → SURVIVED
 
                        insertedMappings[0]++;
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                    }
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                    for (String variant : variants) {
325 1 1. lambda$load$1 : negated conditional → KILLED
 
                        if (!variant.equals(stem)) {
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                            builder.put(variant, patchCommandEncoder.encode(variant, stem));
327 1 1. lambda$load$1 : Replaced integer addition with subtraction → SURVIVED
 
                            insertedMappings[0]++;
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                        }
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                    }
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                });
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        if (LOGGER.isLoggable(Level.FINE)) {
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            LOGGER.log(Level.FINE,
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                    "Loaded stemmer dictionary from {0}; insertedMappings={1}, lines={2}, entries={3}, ignoredLines={4}.",
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                    new Object[] { sourceDescription, insertedMappings[0], statistics.lineCount(),
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                            statistics.entryCount(), statistics.ignoredLineCount() });
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        }
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339 1 1. load : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED
 
        return builder.build();
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    }
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    /**
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     * Loads a GZip-compressed binary patch-command trie from a filesystem path.
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     *
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     * @param path path to the compressed binary trie file
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     * @return compiled patch-command trie
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     * @throws NullPointerException if {@code path} is {@code null}
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     * @throws IOException          if the file cannot be opened, decompressed, or
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     *                              read
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     */
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    public static FrequencyTrie<String> loadBinary(final Path path) throws IOException {
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        Objects.requireNonNull(path, "path");
353 1 1. loadBinary : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED
 
        return StemmerPatchTrieBinaryIO.read(path);
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    }
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    /**
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     * Loads a GZip-compressed binary patch-command trie from a filesystem path
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     * string.
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     *
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     * @param fileName file name or path string
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     * @return compiled patch-command trie
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     * @throws NullPointerException if {@code fileName} is {@code null}
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     * @throws IOException          if the file cannot be opened, decompressed, or
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     *                              read
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     */
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    public static FrequencyTrie<String> loadBinary(final String fileName) throws IOException {
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        Objects.requireNonNull(fileName, "fileName");
368 1 1. loadBinary : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED
 
        return StemmerPatchTrieBinaryIO.read(fileName);
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    }
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    /**
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     * Loads a GZip-compressed binary patch-command trie from an input stream.
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     *
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     * @param inputStream source input stream
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     * @return compiled patch-command trie
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     * @throws NullPointerException if {@code inputStream} is {@code null}
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     * @throws IOException          if the stream cannot be decompressed or read
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     */
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    public static FrequencyTrie<String> loadBinary(final InputStream inputStream) throws IOException {
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        Objects.requireNonNull(inputStream, "inputStream");
381 1 1. loadBinary : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED
 
        return StemmerPatchTrieBinaryIO.read(inputStream);
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    }
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    /**
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     * Saves a compiled patch-command trie as a GZip-compressed binary file.
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     *
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     * @param trie compiled trie
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     * @param path target file
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if writing fails
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     */
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    public static void saveBinary(final FrequencyTrie<String> trie, final Path path) throws IOException {
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        Objects.requireNonNull(trie, "trie");
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        Objects.requireNonNull(path, "path");
395 1 1. saveBinary : removed call to org/egothor/stemmer/StemmerPatchTrieBinaryIO::write → KILLED
 
        StemmerPatchTrieBinaryIO.write(trie, path);
396 
    }
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    /**
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     * Saves a compiled patch-command trie as a GZip-compressed binary file.
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     *
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     * @param trie     compiled trie
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     * @param fileName target file name or path string
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     * @throws NullPointerException if any argument is {@code null}
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     * @throws IOException          if writing fails
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     */
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    public static void saveBinary(final FrequencyTrie<String> trie, final String fileName) throws IOException {
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        Objects.requireNonNull(trie, "trie");
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        Objects.requireNonNull(fileName, "fileName");
409 1 1. saveBinary : removed call to org/egothor/stemmer/StemmerPatchTrieBinaryIO::write → NO_COVERAGE
 
        StemmerPatchTrieBinaryIO.write(trie, fileName);
410 
    }
411
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    /**
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     * Opens a bundled resource from the classpath.
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     *
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     * @param resourcePath classpath resource path
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     * @return opened input stream
417 
     * @throws IOException if the resource cannot be found
418 
     */
419 
    private static InputStream openBundledResource(final String resourcePath) throws IOException {
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        final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
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        final InputStream inputStream = classLoader.getResourceAsStream(resourcePath);
422 1 1. openBundledResource : negated conditional → KILLED
 
        if (inputStream == null) {
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            throw new IOException("Stemmer resource not found: " + resourcePath);
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        }
425 1 1. openBundledResource : replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::openBundledResource → KILLED
 
        return inputStream;
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    }
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}

Mutations

169

1.1
Location : resourcePath
Killed by : none replaced return value with "" for org/egothor/stemmer/StemmerPatchTrieLoader$Language::resourcePath → SURVIVED Covering tests

178

1.1
Location : resourceDirectory
Killed by : none replaced return value with "" for org/egothor/stemmer/StemmerPatchTrieLoader$Language::resourceDirectory → NO_COVERAGE

203

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:BundledDictionaryTests]/[test-template:shouldPreserveAllStemCandidatesForBundledDictionaries(java.lang.String, org.egothor.stemmer.StemmerPatchTrieLoader$Language, org.egothor.stemmer.ReductionMode)]/[test-template-invocation:#16] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

222

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:BundledDictionaryTests]/[test-template:shouldPreserveAllStemCandidatesForBundledDictionaries(java.lang.String, org.egothor.stemmer.StemmerPatchTrieLoader$Language, org.egothor.stemmer.ReductionMode)]/[test-template-invocation:#16] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

242

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldStoreOriginalStemWhenRequested()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

261

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldStoreOriginalStemWhenRequested()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

279

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldLoadEquivalentTrieFromPathAndStringOverloads()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

297

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldLoadEquivalentTrieFromPathAndStringOverloads()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

313

1.1
Location : lambda$load$0
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldStoreOriginalStemWhenRequested()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::lambda$load$0 → KILLED

319

1.1
Location : lambda$load$1
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldStoreOriginalStemWhenRequested()] negated conditional → KILLED

321

1.1
Location : lambda$load$1
Killed by : none Replaced integer addition with subtraction → SURVIVED Covering tests

325

1.1
Location : lambda$load$1
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldNotStoreOriginalStemWhenDisabled()] negated conditional → KILLED

327

1.1
Location : lambda$load$1
Killed by : none Replaced integer addition with subtraction → SURVIVED Covering tests

339

1.1
Location : load
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldStoreOriginalStemWhenRequested()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::load → KILLED

353

1.1
Location : loadBinary
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldRoundTripBinaryTrieAcrossAllBinaryOverloads()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED

368

1.1
Location : loadBinary
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldRoundTripBinaryTrieAcrossAllBinaryOverloads()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED

381

1.1
Location : loadBinary
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldRoundTripBinaryTrieAcrossAllBinaryOverloads()] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::loadBinary → KILLED

395

1.1
Location : saveBinary
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:FilesystemAndParserTests]/[method:shouldRoundTripBinaryTrieAcrossAllBinaryOverloads()] removed call to org/egothor/stemmer/StemmerPatchTrieBinaryIO::write → KILLED

409

1.1
Location : saveBinary
Killed by : none removed call to org/egothor/stemmer/StemmerPatchTrieBinaryIO::write → NO_COVERAGE

422

1.1
Location : openBundledResource
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:BundledDictionaryTests]/[test-template:shouldPreserveAllStemCandidatesForBundledDictionaries(java.lang.String, org.egothor.stemmer.StemmerPatchTrieLoader$Language, org.egothor.stemmer.ReductionMode)]/[test-template-invocation:#16] negated conditional → KILLED

425

1.1
Location : openBundledResource
Killed by : org.egothor.stemmer.StemmerPatchTrieLoaderTest.[engine:junit-jupiter]/[class:org.egothor.stemmer.StemmerPatchTrieLoaderTest]/[nested-class:BundledDictionaryTests]/[test-template:shouldPreserveAllStemCandidatesForBundledDictionaries(java.lang.String, org.egothor.stemmer.StemmerPatchTrieLoader$Language, org.egothor.stemmer.ReductionMode)]/[test-template-invocation:#16] replaced return value with null for org/egothor/stemmer/StemmerPatchTrieLoader::openBundledResource → KILLED

Active mutators

Tests examined


Report generated by PIT 1.22.1