gistfile1.js

receiveMessage: function(aMessage) {
  let msg = aMessage.json;

  switch (aMessage.name) {
  case "Contact:Changed":
    // Fire oncontactchange event
    if (DEBUG) debug("Contacts:ContactChanged: " + msg.contactID + ", " + msg.reason);
    let event = new this._window.MozContactChangeEvent("contactchange", {
      contactID: msg.contactID,
      reason: msg.reason
    });
    this.__DOM_IMPL__.dispatchEvent(event);
    break;
  }
}

test.js

function () {
    ok(true, "Adding a new contact1");
    createResult1 = new mozContact();
    createResult1.initialize(properties1);

    mozContacts.addEventListener("contactchange", function(event) {
      is(event.contactID, createResult1.id, "Same contactID");
      is(event.reason, "create", "Same reason");
      next();
    });

    req = navigator.mozContacts.save(createResult1);
    req.onsuccess = function () {
      ok(createResult1.id, "The contact now has an ID.");
      sample_id1 = createResult1.id;
      checkContacts(properties1, createResult1);
      // next();
    };
    req.onerror = onFailure;
  },