message: Fix tests on Node 8.7
diff: @@ -162,7 +162,7 @@ const cleanupStackTrace = (output: string) => {
  .replace(/\n.*at.*assert\.js.*$/gm, '')
  .replace(/\n.*at.*node\.js.*$/gm, '')
  .replace(/\n.*at.*next_tick\.js.*$/gm, '')
  - .replace(/\n.*at Promise \(<anonymous>\).*$/gm, '')
  + .replace(/\n.*at (new)? Promise \(<anonymous>\).*$/gm, '')
  .replace(/\n.*at <anonymous>.*$/gm, '')
  .replace(/\n.*at Generator.next \(<anonymous>\).*$/gm, '')
  .replace(/^.*at.*[\s][\(]?(\S*\:\d*\:\d*).*$/gm, ' at $1');
  