nut 0.1.4

Bolt DB Port in Rust
Documentation 
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use super::FreeList;
use crate::consts::{Flags, PGID};
use crate::page::{OwnedPage, PageData};

#[test]
fn free() {
    let mut f = FreeList::default();
    let page = {
        let mut page = OwnedPage::new(1024);
        page.id = 12;
        page.overflow = 0;
        page.flags = Flags::FREELIST;
        page
    };
    f.free(100, &page).unwrap();
    assert_eq!(&vec![12], f.pending.get(&100).unwrap());
}

#[test]
fn free_overflow() {
    let mut f = FreeList::default();
    let page = {
        let mut page = OwnedPage::new(1024);
        page.id = 12;
        page.overflow = 3;
        page.flags = Flags::FREELIST;
        page
    };
    f.free(100, &page).unwrap();
    assert_eq!(&vec![12, 13, 14, 15], f.pending.get(&100).unwrap());
}

#[test]
fn release() {
    let mut f = FreeList::default();
    let page = {
        let mut page = OwnedPage::new(1024);
        page.id = 12;
        page.overflow = 1;
        page.flags = Flags::FREELIST;
        page
    };
    f.free(100, &page).unwrap();
    let page = {
        let mut page = OwnedPage::new(1024);
        page.id = 9;
        page.overflow = 0;
        page.flags = Flags::FREELIST;
        page
    };
    f.free(100, &page).unwrap();
    let page = {
        let mut page = OwnedPage::new(1024);
        page.id = 39;
        page.overflow = 0;
        page.flags = Flags::FREELIST;
        page
    };
    f.free(102, &page).unwrap();
    f.release(100);
    f.release(101);

    assert_eq!(vec![9, 12, 13], f.ids);

    f.release(102);
    assert_eq!(vec![9, 12, 13, 39], f.ids);
}

#[test]
fn allocate() {
    let mut f = FreeList {
        ids: vec![3, 4, 5, 6, 7, 9, 12, 13, 18],
        ..Default::default()
    };

    assert_eq!(3, f.allocate(3));
    assert_eq!(vec![6, 7, 9, 12, 13, 18], f.ids);
    assert_eq!(6, f.allocate(1));
    assert_eq!(vec![7, 9, 12, 13, 18], f.ids);
    assert_eq!(0, f.allocate(3));
    assert_eq!(vec![7, 9, 12, 13, 18], f.ids);
    assert_eq!(12, f.allocate(2));
    assert_eq!(vec![7, 9, 18], f.ids);
    assert_eq!(7, f.allocate(1));
    assert_eq!(vec![9, 18], f.ids);
    assert_eq!(0, f.allocate(0));
    assert_eq!(vec![9, 18], f.ids);
    assert_eq!(0, f.allocate(0));
    assert_eq!(vec![9, 18], f.ids);
    assert_eq!(9, f.allocate(1));
    assert_eq!(vec![18], f.ids);
    assert_eq!(18, f.allocate(1));
    assert_eq!(Vec::<PGID>::new(), f.ids);
    assert_eq!(0, f.allocate(1));
    assert_eq!(Vec::<PGID>::new(), f.ids);
}

#[test]
fn read() {
    let mut page = {
        let mut page = OwnedPage::new(1024);
        page.id = 1;
        page.overflow = 0;
        page.flags = Flags::FREELIST;
        page
    };
    let ids: &[PGID] = &[23, 50];
    page.copy_data_from(PageData::Freelist(ids));

    // Deserialize page into a freelist.
    let mut f = FreeList::default();
    f.read(&page);

    assert_eq!(&[23 as PGID, 50], f.ids.as_slice());
}

#[test]
fn write() {
    let mut fl = FreeList {
        ids: vec![12, 39],
        ..Default::default()
    };
    fl.pending.insert(100, vec![28, 11]);
    fl.pending.insert(101, vec![3]);

    let mut page = {
        let mut page = OwnedPage::new(1024);
        page.id = 1;
        page.overflow = 0;
        page.flags = Flags::FREELIST;
        page
    };

    fl.write(&mut page);

    let mut fl2 = FreeList::default();
    fl2.read(&page);

    assert_eq!(vec![3, 11, 12, 28, 39], fl2.ids);
}