ferris-boi/tests/cpu/testutil.rs

use ferris_boi::{cpu::Processor, register};

macro_rules! assert_flags_eq {
    ($processor: expr, $(($flag: path, $value: expr)),+ $(,)?) => {
        $(
            assert_eq!(
                $value,
                $processor.registers.get_flag_bit($flag),
                "{:?} flag had unexpected value",
                $flag
            );
        )+
    };
}

pub(crate) use assert_flags_eq;

pub fn set_opposite_of_expected_flags(
    processor: &mut Processor,
    (zero_flag, sub_flag, half_carry_flag, carry_flag): (u8, u8, u8, u8),
) {
    let invert_flag = |value| {
        if value == 0 {
            1
        } else if value == 1 {
            0
        } else {
            panic!("invalid flag value of {value} ")
        }
    };

    processor
        .registers
        .set_flag_bit(register::Flag::Zero, invert_flag(zero_flag));

    processor
        .registers
        .set_flag_bit(register::Flag::HalfCarry, invert_flag(half_carry_flag));

    processor
        .registers
        .set_flag_bit(register::Flag::Carry, invert_flag(carry_flag));

    processor
        .registers
        .set_flag_bit(register::Flag::Subtract, invert_flag(sub_flag));
}