uxn/tests/vm_tests.rs

use uxn::isa::Icode;
use uxn::vm::*;

#[test]
fn test_brk() {
    let mut vm = Uxn::of1(&[Icode::BRK]);
    assert_eq!(vm.step(), Err(UxnError::Break));
}

#[test]
fn test_lit() {
    let mut vm = Uxn::of1(&[Icode::LIT, 0x01, Icode::BRK]);
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));
}

#[test]
fn test_lit2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xFF, 0xAA,
            Icode::BRK,  // BRK
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFAA));
}

#[test]
fn test_litr() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::RETURN, 0xAA,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.rst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_inc() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xFF, 0xAA,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFAA));
}

#[test]
fn test_pop1() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF,
            Icode::LIT, 0xAA,
            Icode::POP,
            Icode::LIT, 0xBB,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFBB));
}

#[test]
fn test_pop2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF,
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::POP | Icode::SHORT,
            Icode::LIT, 0xCC,
            Icode::BRK,
    ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFCC));
}

#[test]
fn test_popk() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF,
            Icode::POP | Icode::KEEP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xFF));
}

#[test]
fn test_nip() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::NIP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xBB));
}

#[test]
fn test_nip2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xAA, 0x00,
            Icode::LIT | Icode::SHORT, 0xBB, 0x00,
            Icode::NIP | Icode::SHORT,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xBB00));
}

#[test]
fn test_nipk() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::NIP | Icode::KEEP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xBB));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xBB));
}

#[test]
fn test_swp() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::SWP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_swp2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xAA, 0x00,
            Icode::LIT | Icode::SHORT, 0xBB, 0x00,
            Icode::SWP | Icode::SHORT,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get2(0), Ok(0xBB00));
    assert_eq!(vm.wst.borrow().get2(2), Ok(0xAA00));
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xAA00));
}

#[test]
fn test_swpk() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::SWP | Icode::KEEP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(3), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_rot() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::LIT, 0xCC,
            Icode::ROT,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xCC));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_rot_cycle() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::LIT, 0xCC,
            Icode::ROT,
            Icode::ROT,
            Icode::ROT,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xCC));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xCC));
}

#[test]
fn test_dup() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::DUP,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xBB));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xBB));
}

#[test]
fn test_ovr() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::OVR,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().get1(1), Ok(0xBB));
    assert_eq!(vm.wst.borrow().get1(2), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_eql_neg() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::EQL,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x00));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x00));
}

#[test]
fn test_eql_pos() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xAA,
            Icode::EQL,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x01));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));
}

#[test]
fn test_neq_neg() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xAA,
            Icode::NEQ,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x00));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x00));
}

#[test]
fn test_neq_pos() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0xBB,
            Icode::NEQ,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x01));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));
}

#[test]
fn test_gth_neg() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x00,
            Icode::LIT, 0x01,
            Icode::GTH,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x00));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x00));
}

#[test]
fn test_gth_pos() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x01,
            Icode::LIT, 0x00,
            Icode::GTH,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x01));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));
}

#[test]
fn test_lth_neg() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x01,
            Icode::LIT, 0x00,
            Icode::LTH,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x00));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x00));
}

#[test]
fn test_lth_pos() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x00,
            Icode::LIT, 0x01,
            Icode::LTH,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x01));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));
}

#[test]
fn test_jmprp() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xAA,
            Icode::LIT, 0x03,
            Icode::JMP,
            Icode::POP,
            Icode::LIT, 0xFF,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_jmpa() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x10, Icode::JMP | Icode::SHORT,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            Icode::LIT, 0xAA,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_jmprn() {
    // Negative relative jup
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x10, Icode::JMP | Icode::SHORT,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            // Negative relative jump target
            Icode::LIT, 0xAA, Icode::BRK, 0x00,

            // Absolute jump target
            Icode::LIT, -7i8 as u8, Icode::JMP,

            // Wrong arm
            Icode::LIT, 0xFF,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_jmpc_true() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x01,
            Icode::LIT, 0x03,
            Icode::JCN,
            // Fall through
            Icode::LIT, 0xFF, Icode::BRK,

            // Target
            Icode::LIT, 0xAA, Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));
}

#[test]
fn test_jmpc_false() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x00,
            Icode::LIT, 0x03,
            Icode::JCN,
            // Fall through
            Icode::LIT, 0xFF, Icode::BRK,

            // Target
            Icode::LIT, 0xAA, Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xFF));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xFF));
}

#[test]
fn test_jsr() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x05, Icode::JSR, 0x00,
            // Fall through
            0x00, 0x00, 0x00, 0x00,
            // Target
            Icode::LIT, 0xAA, Icode::BRK, 0x00,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));

    assert_eq!(vm.rst.borrow().get2(0), Ok(0x0103));
    assert_eq!(vm.rst.borrow().peek2(), Ok(0x0103));
}

#[test]
fn test_jsra() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x08, Icode::JSR | Icode::SHORT,
            // Fall through
            0x00, 0x00, 0x00, 0x00,
            // Target
            Icode::LIT, 0xAA, Icode::BRK, 0x00,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0xAA));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xAA));

    assert_eq!(vm.rst.borrow().get2(0), Ok(0x0104));
    assert_eq!(vm.rst.borrow().peek2(), Ok(0x0104));
}

#[test]
fn test_sth() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x08, Icode::STH,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().get1(0), Ok(0x01));
    assert_eq!(vm.wst.borrow().peek1(), Ok(0x01));

    assert_eq!(vm.rst.borrow().get1(0), Ok(0x08));
    assert_eq!(vm.rst.borrow().peek1(), Ok(0x08));
}

#[test]
fn test_sth2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x08, Icode::STH | Icode::SHORT,
            Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.rst.borrow().get2(0), Ok(0x0108));
    assert_eq!(vm.rst.borrow().peek2(), Ok(0x0108));
}

#[test]
fn test_ldz() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x0b, Icode::LDZ, Icode::BRK,
        ]);
        vm.sta1(0x000b, 0xFF).unwrap();
    }
    // Make sure the write took
    assert_eq!(vm.lda1(0x00b).unwrap(), 0xFF);
    // Run the example
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 1);
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xFF));
}

#[test]
fn test_ldz2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x0b, Icode::LDZ | Icode::SHORT, Icode::BRK,
        ]);
        vm.sta2(0x000b, 0xFFEE).unwrap();
    }
    // Make sure the write took
    assert_eq!(vm.lda1(0x00b).unwrap(), 0xFF);
    // Run the example
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 2);
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFEE));
}

#[test]
fn test_stz() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF, Icode::LIT, 0x0b,
            Icode::STZ, Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda1(0x000b), Ok(0xFF));
}

#[test]
fn test_stz2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF, Icode::LIT, 0x0b,
            Icode::STZ, Icode::BRK,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda1(0x000b), Ok(0xFF));
}

#[test]
fn test_ldr() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x01, Icode::LDR, Icode::BRK,
            0xFF,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 1);
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xFF));
}

#[test]
fn test_ldr2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0x01, Icode::LDR | Icode::SHORT, Icode::BRK,
            0xFF, 0xEE
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 2);
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xFFEE));
}

#[test]
fn test_str() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xEE, Icode::LIT, 0x03,
            Icode::STR, Icode::BRK, 0x00, 0x00,
            0xFF, // Will be overwritten
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda1(0x0108), Ok(0xEE));
}

#[test]
fn test_str2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xEE, 0xDD, Icode::LIT,
            0x02, Icode::STR | Icode::SHORT, Icode::BRK, 0x00,
            0xFF, 0xFF // Will be overwritten
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda2(0x0108), Ok(0xEEDD));
}

#[test]
fn test_lda() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x08, Icode::LDA,
            Icode::BRK, 0x00, 0x00, 0x00,
            0xEE,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 1);
    assert_eq!(vm.wst.borrow().peek1(), Ok(0xEE));
}

#[test]
fn test_lda2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0x01, 0x08, Icode::LDA | Icode::SHORT,
            Icode::BRK, 0x00, 0x00, 0x00,
            0xEE, 0xDD,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 2);
    assert_eq!(vm.wst.borrow().peek2(), Ok(0xEEDD));
}

#[test]
fn test_sta() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT, 0xFF, Icode::NOP, Icode::NOP,
            Icode::LIT | Icode::SHORT, 0x01, 0x0c, Icode::NOP,
            Icode::STA, Icode::BRK, 0x00, 0x00,
            0x00,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda1(0x010c), Ok(0xFF));
}

#[test]
fn test_sta2() {
    nofmt::pls! {
        let mut vm = Uxn::of1(&[
            Icode::LIT | Icode::SHORT, 0xFF, 0xEE, Icode::NOP,
            Icode::LIT | Icode::SHORT, 0x01, 0x0c, Icode::NOP,
            Icode::STA | Icode::SHORT, Icode::BRK, Icode::NOP,
            0x00, 0x00,
        ]);
    }
    assert_eq!(vm.run(64), Err(UxnError::Break));
    assert_eq!(vm.wst.borrow().idx(), 0);
    assert_eq!(vm.lda2(0x010c), Ok(0xFFEE));
}