Calculator { public double add(double a, double b){ return a+b; }  double add(double a, double b); double sub(double a, double b); double mul(double a, double b); double div(double a, double b); double mod(double a, double b);  }
@Test public void testAddition() { Assert.assertEquals(25.0, aCalculator.add(10.0, 15.0), 0.01); try { Thread.sleep(300*i); } catch (InterruptedException e) { e.printStackTrace(); } i++; }