code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2016 Daniel Naber (http://www.danielnaber.de)
   * 
   * 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.dev.bigdata;
  
  import org.junit.Test;
  import org.languagetool.AnalyzedSentence;
  import org.languagetool.JLanguageTool;
  import org.languagetool.language.English;
  
  import java.io.IOException;
  import java.util.List;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.junit.Assert.*;
  
  public class ContextBuilderTest {
  
    private final ContextBuilder cb = new ContextBuilder();
    private final JLanguageTool lt = new JLanguageTool(new English());
  
    @Test
    public void testGetContext() throws IOException {
      check("And this is a test.",  3/*'is'*/, 1, "[this, is, a]");
      check("And this is a test.",  3/*'is'*/, 2, "[And, this, is, a, test]");
      check("And this is a test.",  3/*'is'*/, 3, "[_START_, And, this, is, a, test, .]");
      check("And this is a test.",  3/*'is'*/, 4, "[_START_, And, this, is, a, test, ., _END_]");
  
      check("This",  1, 0, "[This]");
      check("This",  1, 1, "[_START_, This, _END_]");
      check("This",  1, 2, "[_START_, This, _END_]");
    }
  
    private void check(String input, int pos, int contextSize, String expected) throws IOException {
      AnalyzedSentence sentence = lt.getAnalyzedSentence(input);
      List<String> context = cb.getContext(sentence.getTokensWithoutWhitespace(), pos, contextSize);
      assertThat(context.toString(), is(expected));
    }
  
  }