How to mock a void static method to throw exception with Powermock?

Question

I am trying to use Powermock and Mockito to mock a void static method to throw exception as below. But I met a problem. Unless I make the two invocations of Adder.add() with

Answer 1

Or

PowerMockito.mockStatic(Adder.class);
PowerMockito.doThrow(new IOException()).when(Adder.class, "add", Mathers.eq(12));