@Test  // NEG OP
public void testNEG_3() {

    VM vm = new VM();
    program =  new Program(Hex.decode("61000009"), invoke);
    String expected = "0000000000000000000000000000000000000000000000000000000000000000";
    vm.step(program);
    vm.step(program);
    assertEquals(expected, Hex.toHexString(program.stack.peek().getData()).toUpperCase());
}