gba_test 0.5.0

Testing framework for the Game Boy Advance.
Documentation 
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pub(crate) mod bios;

#[derive(Debug)]
#[repr(transparent)]
pub(crate) struct Interrupt(u16);

impl Interrupt {
    pub(crate) const NONE: Self = Self(0);
    pub(crate) const VBLANK: Self = Self(0b0000_0000_0000_0001);
}

#[derive(Debug)]
#[repr(transparent)]
pub(crate) struct DisplayStatus(u16);

impl DisplayStatus {
    pub(crate) const NONE: Self = Self(0);
    pub(crate) const ENABLE_VBLANK_INTERRUPTS: Self = Self(0b0000_0000_0000_1000);
}

#[derive(Clone, Copy, Debug)]
#[repr(transparent)]
pub(crate) struct DmaControl(u16);

impl DmaControl {
    pub(crate) const fn new() -> Self {
        Self(0)
    }

    pub(crate) const fn with_transfer_32bit(self) -> Self {
        Self(self.0 | 0b0000_0100_0000_0000)
    }

    pub(crate) const fn with_enabled(self) -> Self {
        Self(self.0 | 0b1000_0000_0000_0000)
    }

    pub(crate) const fn to_u16(self) -> u16 {
        self.0
    }
}

#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[repr(transparent)]
pub(crate) struct KeyInput(u16);

impl KeyInput {
    pub(crate) const NONE: Self = Self(0b0000_0011_1111_1111);
    pub(crate) const A: Self = Self(0b0000_0011_1111_1110);
    pub(crate) const B: Self = Self(0b0000_0011_1111_1101);
    pub(crate) const START: Self = Self(0b000_0011_1111_0111);
    pub(crate) const RIGHT: Self = Self(0b0000_0011_1110_1111);
    pub(crate) const LEFT: Self = Self(0b0000_0011_1101_1111);
    pub(crate) const UP: Self = Self(0b0000_0011_1011_1111);
    pub(crate) const DOWN: Self = Self(0b0000_0011_0111_1111);
    pub(crate) const R: Self = Self(0b0000_0010_1111_1111);
    pub(crate) const L: Self = Self(0b0000_0001_1111_1111);

    pub(crate) const fn contains(self, other: Self) -> bool {
        (Self::NONE.0 ^ self.0) & (Self::NONE.0 ^ other.0) == (Self::NONE.0 ^ other.0)
    }
}

#[cfg(test)]
mod tests {
    use super::{DmaControl, KeyInput};
    use gba_test::test;

    #[test]
    fn dma_control_empty() {
        assert_eq!(DmaControl::new().to_u16(), 0);
    }

    #[test]
    fn dma_control_with_transfer_32bit() {
        assert_eq!(DmaControl::new().with_transfer_32bit().to_u16(), 1024);
    }

    #[test]
    fn dma_control_with_enabled() {
        assert_eq!(DmaControl::new().with_enabled().to_u16(), 32768);
    }

    #[test]
    fn dma_control_with_all() {
        assert_eq!(
            DmaControl::new()
                .with_transfer_32bit()
                .with_enabled()
                .to_u16(),
            33792
        );
    }

    #[test]
    fn key_input_none_contains_none() {
        assert!(KeyInput::NONE.contains(KeyInput::NONE))
    }

    #[test]
    fn key_input_none_contains_a() {
        assert!(!KeyInput::NONE.contains(KeyInput::A))
    }

    #[test]
    fn key_input_a_contains_none() {
        assert!(KeyInput::A.contains(KeyInput::NONE))
    }

    #[test]
    fn key_input_a_b_contains_b() {
        assert!(KeyInput(0b0000_0011_1111_1100).contains(KeyInput::B))
    }

    #[test]
    fn key_input_all_contains_all() {
        assert!(KeyInput(0).contains(KeyInput(0)))
    }

    #[test]
    fn key_input_all_contains_none() {
        assert!(KeyInput(0).contains(KeyInput::NONE))
    }
}