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https://github.com/rust-lang/rust.git
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359 lines
8.9 KiB
Rust
359 lines
8.9 KiB
Rust
use core::array::{self, IntoIter};
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use core::convert::TryFrom;
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#[test]
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fn array_from_ref() {
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let value: String = "Hello World!".into();
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let arr: &[String; 1] = array::from_ref(&value);
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assert_eq!(&[value.clone()], arr);
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}
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#[test]
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fn array_from_mut() {
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let mut value: String = "Hello World".into();
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let arr: &mut [String; 1] = array::from_mut(&mut value);
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arr[0].push_str("!");
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assert_eq!(&value, "Hello World!");
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}
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#[test]
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fn array_try_from() {
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macro_rules! test {
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($($N:expr)+) => {
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$({
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type Array = [u8; $N];
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let array: Array = [0; $N];
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let slice: &[u8] = &array[..];
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let result = <&Array>::try_from(slice);
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assert_eq!(&array, result.unwrap());
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})+
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}
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}
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test! {
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0 1 2 3 4 5 6 7 8 9
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10 11 12 13 14 15 16 17 18 19
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20 21 22 23 24 25 26 27 28 29
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30 31 32
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}
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}
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#[test]
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fn iterator_collect() {
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let arr = [0, 1, 2, 5, 9];
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let v: Vec<_> = IntoIter::new(arr.clone()).collect();
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assert_eq!(&arr[..], &v[..]);
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}
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#[test]
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fn iterator_rev_collect() {
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let arr = [0, 1, 2, 5, 9];
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let v: Vec<_> = IntoIter::new(arr.clone()).rev().collect();
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assert_eq!(&v[..], &[9, 5, 2, 1, 0]);
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}
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#[test]
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fn iterator_nth() {
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let v = [0, 1, 2, 3, 4];
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for i in 0..v.len() {
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assert_eq!(IntoIter::new(v.clone()).nth(i).unwrap(), v[i]);
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}
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assert_eq!(IntoIter::new(v.clone()).nth(v.len()), None);
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let mut iter = IntoIter::new(v);
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assert_eq!(iter.nth(2).unwrap(), v[2]);
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assert_eq!(iter.nth(1).unwrap(), v[4]);
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}
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#[test]
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fn iterator_last() {
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let v = [0, 1, 2, 3, 4];
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assert_eq!(IntoIter::new(v).last().unwrap(), 4);
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assert_eq!(IntoIter::new([0]).last().unwrap(), 0);
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let mut it = IntoIter::new([0, 9, 2, 4]);
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assert_eq!(it.next_back(), Some(4));
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assert_eq!(it.last(), Some(2));
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}
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#[test]
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fn iterator_clone() {
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let mut it = IntoIter::new([0, 2, 4, 6, 8]);
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assert_eq!(it.next(), Some(0));
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assert_eq!(it.next_back(), Some(8));
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let mut clone = it.clone();
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assert_eq!(it.next_back(), Some(6));
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assert_eq!(clone.next_back(), Some(6));
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assert_eq!(it.next_back(), Some(4));
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assert_eq!(clone.next_back(), Some(4));
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assert_eq!(it.next(), Some(2));
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assert_eq!(clone.next(), Some(2));
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}
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#[test]
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fn iterator_fused() {
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let mut it = IntoIter::new([0, 9, 2]);
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assert_eq!(it.next(), Some(0));
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assert_eq!(it.next(), Some(9));
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assert_eq!(it.next(), Some(2));
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assert_eq!(it.next(), None);
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assert_eq!(it.next(), None);
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assert_eq!(it.next(), None);
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assert_eq!(it.next(), None);
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assert_eq!(it.next(), None);
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}
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#[test]
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fn iterator_len() {
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let mut it = IntoIter::new([0, 1, 2, 5, 9]);
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assert_eq!(it.size_hint(), (5, Some(5)));
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assert_eq!(it.len(), 5);
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assert_eq!(it.is_empty(), false);
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assert_eq!(it.next(), Some(0));
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assert_eq!(it.size_hint(), (4, Some(4)));
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assert_eq!(it.len(), 4);
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assert_eq!(it.is_empty(), false);
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assert_eq!(it.next_back(), Some(9));
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assert_eq!(it.size_hint(), (3, Some(3)));
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assert_eq!(it.len(), 3);
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assert_eq!(it.is_empty(), false);
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// Empty
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let it = IntoIter::new([] as [String; 0]);
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assert_eq!(it.size_hint(), (0, Some(0)));
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assert_eq!(it.len(), 0);
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assert_eq!(it.is_empty(), true);
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}
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#[test]
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fn iterator_count() {
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let v = [0, 1, 2, 3, 4];
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assert_eq!(IntoIter::new(v.clone()).count(), 5);
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let mut iter2 = IntoIter::new(v);
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iter2.next();
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iter2.next();
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assert_eq!(iter2.count(), 3);
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}
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#[test]
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fn iterator_flat_map() {
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assert!((0..5).flat_map(|i| IntoIter::new([2 * i, 2 * i + 1])).eq(0..10));
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}
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#[test]
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fn iterator_debug() {
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let arr = [0, 1, 2, 5, 9];
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assert_eq!(format!("{:?}", IntoIter::new(arr)), "IntoIter([0, 1, 2, 5, 9])",);
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}
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#[test]
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fn iterator_drops() {
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use core::cell::Cell;
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// This test makes sure the correct number of elements are dropped. The `R`
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// type is just a reference to a `Cell` that is incremented when an `R` is
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// dropped.
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#[derive(Clone)]
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struct Foo<'a>(&'a Cell<usize>);
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impl Drop for Foo<'_> {
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fn drop(&mut self) {
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self.0.set(self.0.get() + 1);
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}
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}
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fn five(i: &Cell<usize>) -> [Foo<'_>; 5] {
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// This is somewhat verbose because `Foo` does not implement `Copy`
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// since it implements `Drop`. Consequently, we cannot write
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// `[Foo(i); 5]`.
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[Foo(i), Foo(i), Foo(i), Foo(i), Foo(i)]
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}
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// Simple: drop new iterator.
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let i = Cell::new(0);
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{
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IntoIter::new(five(&i));
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}
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assert_eq!(i.get(), 5);
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// Call `next()` once.
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let i = Cell::new(0);
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{
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let mut iter = IntoIter::new(five(&i));
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let _x = iter.next();
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assert_eq!(i.get(), 0);
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assert_eq!(iter.count(), 4);
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assert_eq!(i.get(), 4);
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}
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assert_eq!(i.get(), 5);
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// Check `clone` and calling `next`/`next_back`.
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let i = Cell::new(0);
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{
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let mut iter = IntoIter::new(five(&i));
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iter.next();
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assert_eq!(i.get(), 1);
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iter.next_back();
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assert_eq!(i.get(), 2);
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let mut clone = iter.clone();
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assert_eq!(i.get(), 2);
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iter.next();
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assert_eq!(i.get(), 3);
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clone.next();
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assert_eq!(i.get(), 4);
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assert_eq!(clone.count(), 2);
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assert_eq!(i.get(), 6);
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}
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assert_eq!(i.get(), 8);
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// Check via `nth`.
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let i = Cell::new(0);
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{
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let mut iter = IntoIter::new(five(&i));
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let _x = iter.nth(2);
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assert_eq!(i.get(), 2);
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let _y = iter.last();
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assert_eq!(i.get(), 3);
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}
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assert_eq!(i.get(), 5);
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// Check every element.
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let i = Cell::new(0);
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for (index, _x) in IntoIter::new(five(&i)).enumerate() {
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assert_eq!(i.get(), index);
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}
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assert_eq!(i.get(), 5);
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let i = Cell::new(0);
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for (index, _x) in IntoIter::new(five(&i)).rev().enumerate() {
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assert_eq!(i.get(), index);
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}
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assert_eq!(i.get(), 5);
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}
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// This test does not work on targets without panic=unwind support.
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// To work around this problem, test is marked is should_panic, so it will
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// be automagically skipped on unsuitable targets, such as
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// wasm32-unknown-unkown.
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//
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// It means that we use panic for indicating success.
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#[test]
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#[should_panic(expected = "test succeeded")]
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fn array_default_impl_avoids_leaks_on_panic() {
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use core::sync::atomic::{AtomicUsize, Ordering::Relaxed};
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static COUNTER: AtomicUsize = AtomicUsize::new(0);
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#[derive(Debug)]
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struct Bomb(usize);
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impl Default for Bomb {
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fn default() -> Bomb {
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if COUNTER.load(Relaxed) == 3 {
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panic!("bomb limit exceeded");
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}
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COUNTER.fetch_add(1, Relaxed);
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Bomb(COUNTER.load(Relaxed))
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}
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}
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impl Drop for Bomb {
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fn drop(&mut self) {
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COUNTER.fetch_sub(1, Relaxed);
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}
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}
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let res = std::panic::catch_unwind(|| <[Bomb; 5]>::default());
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let panic_msg = match res {
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Ok(_) => unreachable!(),
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Err(p) => p.downcast::<&'static str>().unwrap(),
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};
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assert_eq!(*panic_msg, "bomb limit exceeded");
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// check that all bombs are successfully dropped
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assert_eq!(COUNTER.load(Relaxed), 0);
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panic!("test succeeded")
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}
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#[test]
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fn empty_array_is_always_default() {
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struct DoesNotImplDefault;
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let _arr = <[DoesNotImplDefault; 0]>::default();
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}
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#[test]
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fn array_map() {
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let a = [1, 2, 3];
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let b = a.map(|v| v + 1);
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assert_eq!(b, [2, 3, 4]);
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let a = [1u8, 2, 3];
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let b = a.map(|v| v as u64);
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assert_eq!(b, [1, 2, 3]);
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}
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// See note on above test for why `should_panic` is used.
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#[test]
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#[should_panic(expected = "test succeeded")]
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fn array_map_drop_safety() {
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use core::sync::atomic::AtomicUsize;
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use core::sync::atomic::Ordering;
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static DROPPED: AtomicUsize = AtomicUsize::new(0);
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struct DropCounter;
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impl Drop for DropCounter {
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fn drop(&mut self) {
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DROPPED.fetch_add(1, Ordering::SeqCst);
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}
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}
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let num_to_create = 5;
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let success = std::panic::catch_unwind(|| {
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let items = [0; 10];
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let mut nth = 0;
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items.map(|_| {
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assert!(nth < num_to_create);
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nth += 1;
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DropCounter
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});
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});
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assert!(success.is_err());
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assert_eq!(DROPPED.load(Ordering::SeqCst), num_to_create);
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panic!("test succeeded")
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}
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#[test]
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fn cell_allows_array_cycle() {
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use core::cell::Cell;
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#[derive(Debug)]
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struct B<'a> {
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a: [Cell<Option<&'a B<'a>>>; 2],
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}
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impl<'a> B<'a> {
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fn new() -> B<'a> {
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B { a: [Cell::new(None), Cell::new(None)] }
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}
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}
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let b1 = B::new();
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let b2 = B::new();
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let b3 = B::new();
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b1.a[0].set(Some(&b2));
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b1.a[1].set(Some(&b3));
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b2.a[0].set(Some(&b2));
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b2.a[1].set(Some(&b3));
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b3.a[0].set(Some(&b1));
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b3.a[1].set(Some(&b2));
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}
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