@Test
  public void testToString() {

    Ticket t1 = new WalkupTicket(222);
    String output = t1.toString();
    assertTrue(t1.toString().equals("Number: 222, Price: 50.0"));
  }
  @Test
  public void testGetPrice() {

    Ticket t1 = new WalkupTicket(111);
    Assert.assertEquals(50.0, t1.getPrice(), 0);
  }