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

window.addEventListener("message", onMessageReceived);

function onMessageReceived(event) {
  if (event.data == "step") {
    var performed = false;
    try {
      performed = doStep();
    } catch (ex) {
      postMsg("FAILURE: exception threw at " + location + ":\n" + ex);
      finishTest();
    }

    if (performed) {
      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 todo(a, b, message) {
  postMsg("TODO: " + message + ", expected " + b + " got " + a);
}

function finishTest() {
  try {
    localStorage.clear();
  } catch (e) {}
  postMsg("done");
  return false;
}