public void TestIsValidLanguage()
 {
     string[] validLanguages = { "en", "es" };
     Assert.True(RDFExtensions.IsValidLanguage("en", validLanguages));
     Assert.True(RDFExtensions.IsValidLanguage("es", validLanguages));
     Assert.False(RDFExtensions.IsValidLanguage("de", validLanguages));
 }
 public void TestIsValidLanguageDefault()
 {
     Assert.True(RDFExtensions.IsValidLanguage("en"));
     Assert.False(RDFExtensions.IsValidLanguage("de"));
 }