var list = document.querySelector('#test-list');
var arr = [],  len=list.children.length;
for(var i = 0; i<len; i++) {
  arr.push(list.children[i].childNodes[0].nodeValue);
}
arr.sort();
for(var i = 0; i<len; i++) {
  list.children[i].innerText = arr[i];
}