@Test
public void mergeDiscountTest() {

    double control = 50;
    final double a_price = 50;
    double p_discount = 0.2;
    double t_discount = 0.1;
    double control_discount = 0.28;
    double discount =  CalculPrice.mergeDiscount(p_discount, t_discount);
    assertEquals(control_discount, discount);
}