text: require('../../init.js');
  
  let root = new ProcessTree(null, ProcessTreeOperator.SEQUENCE, null);
  let child1 = new ProcessTree(root, ProcessTreeOperator.EXCLUSIVE, null);
  let child2 = new ProcessTree(root, null, 'label of the visibile leaf');
  let child3 = new ProcessTree(root, null, null);
  root.children.push(child1);
  root.children.push(child2);
  root.children.push(child3);
  let gv = ProcessTreeVanillaVisualizer.apply(root);
  console.log(gv);
  