wrapped_slab 0.4.0

WrappedSlab: Auto-generate newtype idiom based on a Slab
Documentation 
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use wrapped_slab::WrappedSlab;

#[derive(WrappedSlab, PartialEq)]
struct TestUnitStruct(String);

#[test]
fn test_unit_struct() {
    let mut slab = TestUnitStructSlab::with_capacity(32);
    slab.reserve(64);
    assert_eq!(slab.capacity(), 64);

    let key: TestUnitStructKey = slab.insert(TestUnitStruct("testing".into()));

    let val: Option<&TestUnitStruct> = slab.get(key);
    assert_eq!(val.unwrap().0, "testing");

    let val = slab.remove(key);
    assert_eq!(val.0, "testing");

    assert_eq!(slab.len(), 0);
}

#[derive(WrappedSlab, PartialEq, Debug)]
struct TestStruct {
    field1: String,
}

#[test]
fn test_struct() {
    let mut slab = TestStructSlab::with_capacity(32);
    slab.reserve(64);
    assert_eq!(slab.capacity(), 64);

    let key: TestStructKey = slab.insert(TestStruct {
        field1: "testing".into(),
    });

    let val: Option<&TestStruct> = slab.get(key);
    assert_eq!(val.unwrap().field1, "testing");

    let val = slab.remove(key);
    assert_eq!(val.field1, "testing");

    assert_eq!(slab.len(), 0);
}

#[derive(WrappedSlab, PartialEq, Debug)]
enum TestEnum {
    VariantOne(String),
    VariantTwo,
}

#[test]
fn test_enum() {
    let mut slab = TestEnumSlab::with_capacity(32);
    slab.reserve(64);
    assert_eq!(slab.capacity(), 64);

    let key: TestEnumKey = slab.insert(TestEnum::VariantOne("testing".into()));

    let val: Option<&TestEnum> = slab.get(key);
    assert_eq!(val, Some(&TestEnum::VariantOne("testing".into())));

    let val = slab.remove(key);
    assert_eq!(val, TestEnum::VariantOne("testing".into()));

    assert_eq!(slab.len(), 0);
}

#[test]
fn test_vacant_entry() {
    let mut slab = TestEnumSlab::default();
    slab.insert(TestEnum::VariantOne("testing".into()));

    let next_entry: TestEnumVacantEntry = slab.vacant_entry();
    let next_key: TestEnumKey = next_entry.key();
    let next_entry_ref: &mut TestEnum =
        next_entry.insert(TestEnum::VariantOne(format!("{next_key}")));
    assert_eq!(
        next_entry_ref,
        &mut TestEnum::VariantOne(format!("{next_key}"))
    );
}

#[test]
fn test_iter() {
    let mut slab = TestEnumSlab::default();
    slab.insert(TestEnum::VariantOne("testing".into()));

    let mut iter = slab.iter_mut();
    let (idx, s) = iter.next().unwrap();
    assert_eq!(idx, TestEnumKey(0));
    assert_eq!(s, &mut TestEnum::VariantOne("testing".to_string()));
    *s = TestEnum::VariantTwo;
    assert_eq!(iter.next(), None);

    let mut iter = slab.iter();
    let (idx, s) = iter.next().unwrap();
    assert_eq!(idx, TestEnumKey(0));
    assert_eq!(s, &TestEnum::VariantTwo);
    assert_eq!(iter.next(), None);

    let mut iter = slab.into_iter();
    let (idx, s) = iter.next().unwrap();
    assert_eq!(idx, TestEnumKey(0));
    assert_eq!(s, TestEnum::VariantTwo);
    assert_eq!(iter.next(), None);
}

#[test]
fn test_drain() {
    let mut slab = TestEnumSlab::with_capacity(32);
    slab.reserve(64);
    assert_eq!(slab.capacity(), 64);

    slab.insert(TestEnum::VariantTwo);

    let mut drain = slab.drain();
    assert_eq!(drain.len(), 1);
    let s = drain.next().unwrap();
    assert_eq!(s, TestEnum::VariantTwo);
    assert_eq!(drain.len(), 0);
    drop(drain);

    assert_eq!(slab.len(), 0);
}

#[test]
fn test_index() {
    let mut slab = TestEnumSlab::with_capacity(32);
    slab.reserve(64);
    assert_eq!(slab.capacity(), 64);

    slab.insert(TestEnum::VariantTwo);

    let s = &slab[TestEnumKey(0)];
    assert_eq!(s, &TestEnum::VariantTwo);

    let s = &mut slab[TestEnumKey(0)];
    assert_eq!(s, &mut TestEnum::VariantTwo);
}