/**
  * Test method for {@link
  * org.jvoicexml.xml.LanguageIdentifierConverter#toLocale(java.lang.String)}.
  */
 @Test
 public void testToLocale() {
   final Locale locale1 = LanguageIdentifierConverter.toLocale("de");
   Assert.assertEquals(Locale.GERMAN, locale1);
   final Locale locale2 = LanguageIdentifierConverter.toLocale("en-US");
   Assert.assertEquals(Locale.US, locale2);
   final Locale locale3 = LanguageIdentifierConverter.toLocale(null);
   Assert.assertNull(locale3);
 }
 /**
  * Test method for {@link
  * org.jvoicexml.xml.LanguageIdentifierConverter#toLanguageIdentifier(java.util.Locale)}.
  */
 @Test
 public void testToLanguageIdentifier() {
   final String id1 = LanguageIdentifierConverter.toLanguageIdentifier(Locale.GERMAN);
   Assert.assertEquals("de", id1);
   final String id2 = LanguageIdentifierConverter.toLanguageIdentifier(Locale.US);
   Assert.assertEquals("en-US", id2);
   final String id3 = LanguageIdentifierConverter.toLanguageIdentifier(null);
   Assert.assertNull(id3);
 }