#[path = "../../../os-turkfs-allocation/src/lib.rs"]
mod allocation;

const RESERVED: u64 = 0x1f;

#[test]
fn os_turkfs_allocation_extent_growth_positive() {
    let all = (1u64 << 32) - 1;
    let mut bitmap = allocation::Bitmap::validate(32, RESERVED,
        all & !(1u64 << 20) & !(1u64 << 30)).unwrap();
    let mut file = allocation::ExtentFile::one_block(10, &bitmap).unwrap();
    let first = file.blocks()[0];
    assert_eq!(file.count(), 1);
    assert_eq!(bitmap.counts().free, 2);
    assert_eq!(file.grow_to_three(&mut bitmap), Ok(()));
    assert_eq!(file.count(), 3);
    assert_eq!(file.blocks(), [first, 20, 30]);
    assert_eq!(bitmap.counts().free, 0);
    assert_eq!(bitmap.counts().reserved + bitmap.counts().user, 32);
}

#[test]
fn os_turkfs_allocation_extent_growth_negative() {
    let all = (1u64 << 32) - 1;
    let mut bitmap = allocation::Bitmap::validate(32, RESERVED,
        all & !(1u64 << 20)).unwrap();
    let mut file = allocation::ExtentFile::one_block(10, &bitmap).unwrap();
    let file_before = file;
    let bitmap_before = bitmap;
    assert_eq!(file.grow_to_three(&mut bitmap),
        Err(allocation::Error::NoSpace));
    assert_eq!(file, file_before);
    assert_eq!(bitmap, bitmap_before);
    assert_eq!(allocation::ExtentFile::one_block(2, &bitmap),
        Err(allocation::Error::UnownedFirstBlock));
    assert_eq!(allocation::ExtentFile::one_block(32, &bitmap),
        Err(allocation::Error::OutOfBounds));
}