### Question:
FilterTrack extends Track implements TileableListener { public Track getTrack() { return track; } FilterTrack(Track track, MarbleType marbleType); Track getTrack(); MarbleType getMarbleType(); @Override boolean isConnected(); @Override boolean allowsConnection(Direction direction); @Override boolean accepts(Direction direction, Marble marble); @Override boolean passesMidpoint(Direction direction, Marble marble); @Override void accept(Direction direction, Marble marble); @Override void setTile(Tile tile); @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 getTrack() { assertThat(track.getTrack()).isEqualTo(inner); }