public void GetIdElement_StringNull()
        {
            XmlDecryption ex = new XmlDecryption();

            Assert.Throws <ArgumentNullException>(() => ex.GetIdElement(new XmlDocument(), null));
        }
        public void GetIdElement_XmlDocumentNull()
        {
            XmlDecryption ex = new XmlDecryption();

            Assert.Null(ex.GetIdElement(null, "value"));
        }