function postMsg(message) {
  opener.postMessage(message, "http://mochi.test:8888");
}

window.addEventListener("message", onMessageReceived);

function onMessageReceived(event) {
  //alert("slave got event: "+event.data);
  if (event.data == "step") {
    if (doStep()) {
      postMsg("perf");
    }

    return;
  }

  postMsg("Invalid message");
}

function ok(a, message) {
  if (!a) {
    postMsg("FAILURE: " + message);
  } else {
    postMsg(message);
  }
}

function is(a, b, message) {
  if (a != b) {
    postMsg("FAILURE: " + message + ", expected " + b + " got " + a);
  } else {
    postMsg(message + ", expected " + b + " got " + a);
  }
}

function finishTest() {
  sessionStorage.clear();
  postMsg("done");
  return false;
}