code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2015 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.languagemodel;
  
  import org.junit.Test;
  import org.languagetool.rules.ngrams.Probability;
  
  import java.util.Arrays;
  import java.util.List;
  
  import static org.junit.Assert.*;
  
  @SuppressWarnings("MagicNumber")
  public class MultiLanguageModelTest {
    
    @Test
    public void test() {
      try (
        LanguageModel lm1 = new FakeLanguageModel(0.5f);
        LanguageModel lm2 = new FakeLanguageModel(0.2f);
        MultiLanguageModel lm = new MultiLanguageModel(Arrays.asList(lm1, lm2))) {
        List<String> ngram = Arrays.asList("foo", "bar", "blah");
        assertEquals(0.7f, lm.getPseudoProbability(ngram).getProb(), 0.01f);
        assertEquals(0.5f, lm.getPseudoProbability(ngram).getCoverage(), 0.01f);
      }
    }
  
    private static class FakeLanguageModel implements LanguageModel {
      private final float fakeValue;
      FakeLanguageModel(float fakeValue) {
        this.fakeValue = fakeValue;
      }
      @Override
      public Probability getPseudoProbability(List<String> context) {
        return new Probability(fakeValue, 0.5f);
      }
      @Override public void close() {}
    }
  }
  