message: remove arrow function from test
diff: @@ -44,7 +44,7 @@ describe("window.onunhandledrejection", function() {
  window.dispatchEvent(
  new CustomEvent("unhandledrejection", {
  detail: {
  - promise: new Promise(() => {}),
  + promise: new Promise(function() {}),
  // we're testing with an error here but it could be anything - really
  // all we're testing is that it gets dug out correctly
  reason: new Error("test2"),
  