### Question:
Teleporter extends Tileable implements TileableListener { public Teleporter getDestination() { return destination; } Teleporter(Track track); void setDestination(Teleporter destination); Track getTrack(); Teleporter getDestination(); @Override boolean allowsConnection(Direction direction); @Override boolean accepts(Direction direction, Marble marble); @Override void accept(Direction direction, Marble marble); @Override void ballAccepted(Tileable tileable, Direction direction, Marble marble); @Override void ballDisposed(Tileable tileable, Direction direction, Marble marble); @Override void ballReleased(Tileable tileable, Direction direction, Marble marble);  }### Answer:
@Test public void getDestination() { assertThat(teleporter1.getDestination()).isEqualTo(teleporter2); assertThat(teleporter2.getDestination()).isEqualTo(teleporter1); }