dyn_vec 0.1.0

A Vec<T: ?Sized>
Documentation 
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//! Always use `cargo miri test --all-features`, and never just `cargo test`.

#[cfg(all(miri, not(feature = "unstable")))]
#[test]
#[allow(warnings)]
fn aaaaaaaaaa_first_alphabetical() {
    let you_should_specify_dash_dash_all_features = std::ptr::null::<()>();
    unsafe {
        *you_should_specify_dash_dash_all_features;
    }
}

use rand::{thread_rng, Rng};

use super::{dyn_vec, DynVec};
use std::{
    any::Any,
    fmt::Debug,
    sync::atomic::{AtomicBool, Ordering},
};

trait DebugExt: Debug {
    fn debug(&self) -> String {
        format!("{self:?}")
    }
}

impl<T: Debug + ?Sized> DebugExt for T {}

#[test]
fn basic_push() {
    let mut vec: DynVec<i32> = DynVec::new();
    vec.push(3);
    vec.push(5);
    vec.push(7);
    assert_eq!(vec, [3, 5, 7]);
}

#[test]
fn box_push() {
    let mut vec: DynVec<dyn Debug> = DynVec::new();
    vec.push_box(Box::new(1) as _); // makes r-a happy, idk
    vec.push_box(Box::new(String::from("foo")));
    vec.push_box(Box::new(true));
    assert_eq!(vec.debug(), "[1, \"foo\", true]");
}

#[test]
fn unsize_push() {
    let mut vec: DynVec<dyn Debug> = DynVec::new();
    vec.push_unsize_stable(1, |v| v as _);
    vec.push_unsize_stable(String::from("foo"), |v| v as _);
    vec.push_unsize_stable(true, |v| v as _);
    assert_eq!(vec.debug(), "[1, \"foo\", true]");
}

#[test]
fn all_macro() {
    let vec: DynVec<i32> = dyn_vec![3, 5, 7];
    assert_eq!(vec, [3, 5, 7]);

    let vec2: DynVec<dyn Debug> = dyn_vec![box:
        Box::new(1) as _,
        Box::new(String::from("foo")) as _,
        Box::new(true) as _,
    ];
    let vec3: DynVec<dyn Debug> = dyn_vec![unsized: 1, String::from("foo"), true];
    assert_eq!(vec2.debug(), vec3.debug());

    let vec4: DynVec<i32> = dyn_vec![3; 5];
    assert_eq!(vec4, [3; 5]);
}

#[test]
fn dropped() {
    static DROPPED: AtomicBool = AtomicBool::new(false);

    #[derive(Debug)] // for dyn Debug
    struct FunkyDrop;
    impl Drop for FunkyDrop {
        fn drop(&mut self) {
            DROPPED.store(true, Ordering::SeqCst);
        }
    }

    let vec: DynVec<dyn Debug> = dyn_vec![unsized: 1, FunkyDrop, true];

    assert!(!DROPPED.load(Ordering::SeqCst));

    drop(vec);

    assert!(DROPPED.load(Ordering::SeqCst));
}

#[test]
fn get() {
    let vec: DynVec<i32> = dyn_vec![3, 5, 7];
    assert_eq!(vec.get(0).copied(), Some(3));
    assert_eq!(vec.get(1).copied(), Some(5));
    assert_eq!(vec.get(2).copied(), Some(7));
    assert_eq!(vec.get(3).copied(), None);
}

#[test]
#[should_panic = "index out of bounds: the len is 3 but the index is 3"]
fn index() {
    let vec: DynVec<i32> = dyn_vec![3, 5, 7];
    assert_eq!(vec[0], 3);
    assert_eq!(vec[1], 5);
    assert_eq!(vec[2], 7);
    let _ = vec[3];
}

#[test]
fn slice_flatten() {
    let mut vec: DynVec<[i32]> = dyn_vec![unsized: [1, 2, 3], [4, 5], [6, 7, 8, 9]];
    assert_eq!(vec.as_slice_flatten(), [1, 2, 3, 4, 5, 6, 7, 8, 9]);
    vec.as_mut_slice_flatten()[4] = 10;
    assert_eq!(vec[1], [4, 10]);
}

#[test]
fn iteration() {
    let mut vec: DynVec<dyn Debug> = dyn_vec![unsized: 1, String::from("foo"), true];

    let mut iter = vec.iter();
    assert_eq!(iter.next().unwrap().debug(), "1");
    assert_eq!(iter.next().unwrap().debug(), "\"foo\"");
    assert_eq!(iter.next().unwrap().debug(), "true");
    assert_eq!(iter.next().map(|_| ()), None);

    let mut iter = vec.iter_mut(); // TODO: create a trait to properly test this
    assert_eq!(iter.next().unwrap().debug(), "1");
    assert_eq!(iter.next().unwrap().debug(), "\"foo\"");
    assert_eq!(iter.next().unwrap().debug(), "true");
    assert_eq!(iter.next().map(|_| ()), None);

    let mut debugs = DynVec::new(); // using custom vec instead of std vec >:)
    for item in vec {
        debugs.push(item.debug());
    }
    assert_eq!(debugs, ["1", "\"foo\"", "true"]);
}

#[test]
fn zst() {
    #[derive(Debug, PartialEq, Eq)]
    struct Zst;

    let vec: DynVec<Zst> = dyn_vec![Zst, Zst, Zst];

    assert_eq!(vec[1], Zst);
    for el in vec.iter() {
        let _ = el;
    }
    assert_eq!(vec.debug(), "[Zst, Zst, Zst]");

    let vec: DynVec<dyn Debug> = dyn_vec![unsized: Zst, (), Zst];

    assert_eq!(vec[1].debug(), "()");
    for el in vec.iter() {
        let _ = el;
    }
    assert_eq!(vec.debug(), "[Zst, (), Zst]");
}

#[test]
fn downcast() {
    let mut vec: DynVec<dyn Any> = dyn_vec![unsized: 1, String::from("foo"), true];

    assert_eq!(vec.downcast_get::<f32>(0), None);
    assert_eq!(vec.downcast_get::<i32>(0), Some(&1));
    assert_eq!(vec.downcast_get_mut::<f32>(1), None);
    assert_eq!(
        vec.downcast_get_mut::<String>(1),
        Some(&mut String::from("foo"))
    );
    assert_eq!(vec.downcast_pop::<f32>(), None);
    assert_eq!(vec.downcast_pop::<bool>(), Some(true));
}

#[test]
fn pop() {
    let mut vec: DynVec<dyn Debug> = dyn_vec![unsized: 1, String::from("foo"), true];

    assert_eq!(vec.pop().debug(), "Some(true)");
    assert_eq!(vec.pop().debug(), "Some(\"foo\")");
    assert_eq!(vec.pop().debug(), "Some(1)");
    assert_eq!(vec.pop().debug(), "None");
}

#[test]
fn with_capacity() {
    // 4 and not 3 cause of `Layout::pad_to_align`
    let mut vec = DynVec::with_capacity(4);

    let prev_ptr = vec.as_ptr();

    vec.push(1);
    vec.push(2);
    vec.push(3);
    vec.push(4);

    assert_eq!(prev_ptr, vec.as_ptr());

    vec.push(5);
    // should have realloc'ed by now

    assert_ne!(prev_ptr, vec.as_ptr());
}

#[test]
fn unsize() {
    let vec = dyn_vec![1, 2, 3];
    let mut vec: DynVec<dyn Debug> = vec.unsize_stable(|v| v as _);
    vec.push_unsize_stable(String::from("foo"), |v| v as _);
    assert_eq!(vec.debug(), "[1, 2, 3, \"foo\"]");
}

#[test]
fn remove() {
    let mut vec: DynVec<dyn Debug> = dyn_vec![unsized: 1, String::from("foo"), true];
    assert_eq!(vec.remove(1).unwrap().debug(), "\"foo\"");
    assert_eq!(vec.debug(), "[1, true]");
}

#[test]
fn stress_test() {
    let mut vec: DynVec<dyn Debug> = DynVec::new();

    let mut rng = thread_rng();

    let mut len = 0;

    let iterations = if cfg!(miri) { 100 } else { 1_000_000 };

    for _ in 0..iterations {
        if len == 0 || rng.gen_bool(0.7) {
            len += 1;

            match rng.gen_range(1..=3) {
                1 => vec.push_unsize_stable("a string", |v| v as _),
                2 => vec.push_unsize_stable(1, |v| v as _),
                3 => vec.push_unsize_stable(true, |v| v as _),
                _ => unreachable!(),
            }
        } else {
            len -= 1;

            vec.pop();
        }

        assert_eq!(len, vec.len());
    }
}