private  SaleCtr saleCtr;
    @org.junit.Before
    public void setUp() throws Exception {
        SaleCtr saleCtr = new SaleCtr();
        ProductContainer productContainer = ProductContainer.getInstance();
        productContainer.addProduct(new Product(3, "some string", 15, 30));
    }

    @org.junit.After
    public void tearDown() throws Exception {

    }

    @org.junit.Test
    public void addProduct() throws Exception {
        assertEquals(true, saleCtr.addProduct(3,5));
    }