### Question:
VerticalTrack extends Track { @Override public boolean passesMidpoint(Direction direction, Marble marble) { return true; }  boolean isConnected(); @Override boolean passesMidpoint(Direction direction, Marble marble); @Override boolean allowsConnection(Direction direction); @Override boolean accepts(Direction direction, Marble marble); @Override void accept(Direction direction, Marble marble);  }### Answer:
@Test public void passesMidpointLeft() { assertThat(track.passesMidpoint(Direction.LEFT, marble)).isTrue(); }
@Test public void passesMidpointRight() { assertThat(track.passesMidpoint(Direction.RIGHT, marble)).isTrue(); }
@Test public void passesMidpointTop() { assertThat(track.passesMidpoint(Direction.TOP, marble)).isTrue(); }
@Test public void passesMidpointBottom() { assertThat(track.passesMidpoint(Direction.BOTTOM, marble)).isTrue(); }