@Before
  public void init() {
    PiechartObserver pieObserver = new PiechartObserver();
    TableObserver tableObserver = new TableObserver();
    ThreeDObserver threeDObserver = new ThreeDObserver();
    stock = new StockQuoteObservable();

    stock.addObserver(pieObserver);
    stock.addObserver(tableObserver);
    stock.addObserver(threeDObserver);
    quote = 21.6f;
  }
 @Test
 public void testChangeQuoteStockEvent() throws InterruptedException {
   stock.changeQuote(new StockEvent(quote, "Microsoft Stock"));
 }
 @Test
 public void testChangeQuoteFloatString() throws InterruptedException {
   stock.changeQuote(quote, "Microsoft Stock");
 }