public void GetCustomPropertyFromDocumentReturnNullIfItDoesNotExists()
 {
     using (var docxDocument = new DocxDocument(Resources.DocumentWithoutAttributes))
     {
         Assert.Null(docxDocument.GetCustomProperty("customAttributes"));
     }
 }
 public void GetCustomPropertyFromDocument()
 {
     using (var docxDocument = new DocxDocument(Resources.DocumentWithAttribute))
     {
         Assert.Equal("Working", docxDocument.GetCustomProperty("customAttributes"));
     }
 }