@Test  // XOR OP
public void testXOR_2() {

    VM vm = new VM();
    program =  new Program(Hex.decode("600F60F012"), invoke);
    String expected = "00000000000000000000000000000000000000000000000000000000000000FF";
    vm.step(program);
    vm.step(program);
    vm.step(program);
    assertEquals(expected, Hex.toHexString(program.stack.peek().getData()).toUpperCase()  );
}