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LanguageTool is an Open Source proofreading software for English, French, German, Polish, Romanian, and more than 20 other languages. It finds many errors that a simple spell checker cannot detect like mixing up there/their and it detects some grammar problems.

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/* LanguageTool, a natural language style checker
 * Copyright (C) 2018 Fabian Richter
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
 * USA
 */
package org.languagetool.rules;

import java.util.Arrays;
import java.util.List;

final class TestHackHelper {

  private TestHackHelper() {
  }

  static boolean isJUnitTest() {
    StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
    List list = Arrays.asList(stackTrace);
    for (StackTraceElement element : list) {
      if (element.getClassName().startsWith("org.junit.") ||
              element.getClassName().equals("org.languagetool.rules.patterns.PatternRuleTest")) {
        return true;
      }
    }
    return false;
  }
}