• Expected initialization: foo{}bar.
• Press some keys - nothing should be added to editor's contents.
• When press some key - event keydown should be logged. When the key is released - event keyup should be logged.
• You can hold the key in order to check whether keydown event is fired multiple times. After releasing the key, keyup event should be fired once.
• Check whether key events are logged to the console with proper data:
  • keyCode,
  • altKey,
  • ctrlKey (covers Ctrl and Cmd),
  • shitKey,
  • domTarget and target.