code: /* LanguageTool, a natural language style checker 
   * Copyright (C) 2014 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.rules.ngrams;
  
  import org.junit.Test;
  import org.languagetool.FakeLanguage;
  import org.languagetool.JLanguageTool;
  import org.languagetool.Language;
  import org.languagetool.languagemodel.LanguageModel;
  import org.languagetool.rules.Rule;
  import org.languagetool.rules.RuleMatch;
  
  import java.io.IOException;
  import java.util.Arrays;
  import java.util.List;
  
  import static org.hamcrest.core.Is.is;
  import static org.junit.Assert.assertThat;
  
  public class ConfusionProbabilityRuleTest {
  
    private final ConfusionProbabilityRule rule = new FakeRule(new FakeLanguageModel(), new FakeLanguage());
    private final JLanguageTool lt = new JLanguageTool(new FakeLanguage());
  
    @Test
    public void testRule() throws IOException {
      assertGood("Their");
      assertGood("There");
      assertMatch("Their are new ideas to explore.");
      assertGood("There are new ideas to explore.");
      assertMatch("Why is there car broken again?");
      assertGood("Why is their car broken again?");
      assertGood("Is this their useful test?");
      assertGood("Is this there useful test?");  // error not found b/c no data
      ConfusionProbabilityRule ruleWithException = new FakeRule(new FakeLanguageModel(), new FakeLanguage()) {
        @Override
        protected boolean isException(String sentenceText, int startPos, int endPos) {
          return sentenceText.contains("Their are");
        }
      };
      assertGood("Their are new ideas to explore.", ruleWithException);
      assertGood("\"Their are new ideas to explore.\"", ruleWithException);
      assertGood("But İm dabei gut auszusehen.");
    }
  
    @Test
    public void testLocalException() throws IOException {
      ConfusionProbabilityRule rule1 = new FakeRule(new FakeLanguageModel(), new FakeLanguage()) {};
      assertMatch("Their are new ideas to explore.", rule1);
      ConfusionProbabilityRule rule2 = new FakeRule(new FakeLanguageModel(), new FakeLanguage(), Arrays.asList("their are")) {};
      assertGood("Their are new ideas to explore.", rule2);
      assertGood("And their are new ideas to explore.", rule2);
      assertGood("Their are new ideas to explore and their are new plans.", rule2);
    }
  
    private void assertMatch(String input, Rule rule) throws IOException {
      RuleMatch[] matches = rule.match(lt.getAnalyzedSentence(input));
      assertThat("Did not find match in: " + input, matches.length, is(1));
    }
  
    private void assertMatch(String input) throws IOException {
      assertMatch(input, rule);
    }
  
    private void assertGood(String input, Rule rule) throws IOException {
      RuleMatch[] matches = rule.match(lt.getAnalyzedSentence(input));
      assertThat("Got unexpected match in: " + input, matches.length, is(0));
    }
  
    private void assertGood(String input) throws IOException {
      assertGood(input, rule);
    }
  
    private static class FakeRule extends ConfusionProbabilityRule {
      private FakeRule(LanguageModel languageModel, Language language) {
        super(JLanguageTool.getMessageBundle(), languageModel, language);
      }
      private FakeRule(LanguageModel languageModel, Language language, List<String> exceptions) {
        super(JLanguageTool.getMessageBundle(), languageModel, language, 3, exceptions);
      }
      @Override
      public String getDescription() {
        return null;
      }
    }
  
  }
  