This dont work...How can I set a value to a node something like <TESTING-ONE>some value</TESTING-ONE>

var testVal = "some value"
    var XML = document.createElement("div");
                                var Node = document.createElement("ROOT NODE");
                                var node1 = document.createElement("TESTING-ONE");
                                    node1.appendChild( testVal );
                                    Node.appendChild(node1);
                                    XML.appendChild(Node);

                                    alert(XML.innerHTML);

How can I set a value to a node

var testVal = "some value"
var XML = document.createElement("div");
var Node = document.createElement("ROOT NODE");
var node1 = document.createElement("TESTING-ONE");
 
node1.appendChild( testVal );                                    
Node.appendChild(node1);
XML.appendChild(Node);

alert(XML.innerHTML);