node/deps/v8/test/mjsunit/debug-liveedit-check-stack.js

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// Flags: --expose-debug-as debug
// Get the Debug object exposed from the debug context global object.

Debug = debug.Debug

eval(
    "function ChooseAnimal(callback) {\n " +
    "  callback();\n" +
    "  return 'Cat';\n" +
    "}\n"
);

function Noop() {}
var res = ChooseAnimal(Noop);

assertEquals("Cat", res);

var script = Debug.findScript(ChooseAnimal);

var orig_animal = "'Cat'";
var patch_pos = script.source.indexOf(orig_animal);
var new_animal_patch = "'Capybara'";

var got_exception = false;
var successfully_changed = false;

function Changer() {
  // Never try the same patch again.
  assertEquals(false, successfully_changed);
  var change_log = new Array();
  try {
    Debug.LiveEditChangeScript(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
    successfully_changed = true;
  } catch (e) {
    if (e instanceof Debug.LiveEditChangeScript.Failure) {
      got_exception = true;
      print(e);
    } else {
      throw e;
    }
  }
  print("Change log: " + JSON.stringify(change_log) + "\n");
}

var new_res = ChooseAnimal(Changer);
// Function must be not pached.
assertEquals("Cat", new_res);

assertEquals(true, got_exception);

// This time it should succeed.
Changer();

new_res = ChooseAnimal(Noop);
// Function must be not pached.
assertEquals("Capybara", new_res);