code: package zemberek.langid;
  
  import java.io.IOException;
  import org.junit.Assert;
  import org.junit.Test;
  
  public class LanguageIndentifierTest {
  
    @Test
    public void allModelTest() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModels();
      Assert.assertEquals("tr", lid.identify("merhaba dünya ve tüm gezegenler"));
      Assert.assertEquals("en", lid.identify("hello world and all the planets what is this?"));
      Assert.assertEquals("es", lid.identify("Hola mundo y todos los planetas"));
      Assert.assertEquals("fr", lid.identify("Bonjour tout le monde et toutes les planètes"));
      Assert
          .assertEquals("az", lid.identify("Salam dünya və bütün planetlərin bu həqiqətən pis olur"));
    }
  
    @Test
    public void allModelSamplingTest() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModels();
      Assert.assertEquals("tr", lid.identify("merhaba dünya ve tüm gezegenler", 20));
      Assert.assertEquals("en", lid.identify("hello world and all the planets what is this?", 20));
      Assert.assertEquals("es", lid.identify("Hola mundo y todos los planetas", 20));
      Assert.assertEquals("fr", lid.identify("Bonjour tout le monde et toutes les planètes", 20));
      Assert.assertEquals("az",
          lid.identify("Salam dünya və bütün planetlərin bu həqiqətən pis olur", 20));
    }
  
    @Test
    public void allModelFastSamplingTest() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModels();
      Assert.assertEquals("tr", lid.identifyFast("merhaba dünya ve tüm gezegenler", 20));
      Assert
          .assertEquals("en", lid.identifyFast("hello world and all the planets what is this?", 20));
      Assert.assertEquals("es", lid.identifyFast("Hola mundo y todos los planetas", 20));
      Assert.assertEquals("fr", lid.identifyFast("Bonjour tout le monde et toutes les planètes", 20));
      Assert.assertEquals("az",
          lid.identifyFast("Salam dünya və bütün planetlərin bu həqiqətən pis olur", 20));
    }
  
    @Test
    public void modelGroupTest() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModelGroup("tr_group");
      Assert.assertEquals("tr", lid.identify("merhaba dünya ve tüm gezegenler"));
      Assert.assertEquals("unk", lid.identify("Hola mundo y todos los planetas"));
    }
  
    @Test
    public void testContainsLanguage() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModels();
      String tr_es = "merhaba dünya ve tüm gezegenler Hola mundo y todos los planetas";
      Assert.assertTrue(lid.containsLanguage(tr_es, "tr", 20));
      Assert.assertTrue(lid.containsLanguage(tr_es, "es", 20));
  
      Assert.assertFalse(lid.containsLanguage(tr_es, "ar", 20));
  
      String es_en = "Hola mundo y todos los planetas " +
          "The state is that great fiction by which everyone tries to live at the expense of everyone else";
      Assert.assertTrue(lid.containsLanguage(es_en, "es", 20));
      Assert.assertTrue(lid.containsLanguage(es_en, "en", 20));
      Assert.assertFalse(lid.containsLanguage(es_en, "tr", 20));
      Assert.assertFalse(lid.containsLanguage(es_en, "ar", 20));
    }
  
    @Test
    public void getLanguagesTest() throws IOException {
      LanguageIdentifier lid = LanguageIdentifier.fromInternalModelGroup("tr_group");
      Assert.assertTrue(lid.getLanguages().contains("tr"));
      Assert.assertTrue(lid.getLanguages().contains("en"));
      Assert.assertFalse(lid.getLanguages().contains("unk"));
      Assert.assertFalse(lid.getLanguages().contains("ar"));
    }
  }
  