From b9330f0c56e6a7994bd421b0b722496b28b7bd89 Mon Sep 17 00:00:00 2001 From: Haibo Huang Date: Tue, 11 Aug 2020 18:27:35 -0700 Subject: Upgrade rust/crates/smallvec to 1.4.2 Test: None Change-Id: I26b4cef675b3dba23235131a9d33d46372c06d9c --- src/tests.rs | 907 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 907 insertions(+) create mode 100644 src/tests.rs (limited to 'src/tests.rs') diff --git a/src/tests.rs b/src/tests.rs new file mode 100644 index 0000000..0452ae8 --- /dev/null +++ b/src/tests.rs @@ -0,0 +1,907 @@ +use crate::{smallvec, SmallVec}; + +use std::iter::FromIterator; + +use alloc::borrow::ToOwned; +use alloc::boxed::Box; +use alloc::rc::Rc; +use alloc::{vec, vec::Vec}; + +#[test] +pub fn test_zero() { + let mut v = SmallVec::<[_; 0]>::new(); + assert!(!v.spilled()); + v.push(0usize); + assert!(v.spilled()); + assert_eq!(&*v, &[0]); +} + +// We heap allocate all these strings so that double frees will show up under valgrind. + +#[test] +pub fn test_inline() { + let mut v = SmallVec::<[_; 16]>::new(); + v.push("hello".to_owned()); + v.push("there".to_owned()); + assert_eq!(&*v, &["hello".to_owned(), "there".to_owned(),][..]); +} + +#[test] +pub fn test_spill() { + let mut v = SmallVec::<[_; 2]>::new(); + v.push("hello".to_owned()); + assert_eq!(v[0], "hello"); + v.push("there".to_owned()); + v.push("burma".to_owned()); + assert_eq!(v[0], "hello"); + v.push("shave".to_owned()); + assert_eq!( + &*v, + &[ + "hello".to_owned(), + "there".to_owned(), + "burma".to_owned(), + "shave".to_owned(), + ][..] + ); +} + +#[test] +pub fn test_double_spill() { + let mut v = SmallVec::<[_; 2]>::new(); + v.push("hello".to_owned()); + v.push("there".to_owned()); + v.push("burma".to_owned()); + v.push("shave".to_owned()); + v.push("hello".to_owned()); + v.push("there".to_owned()); + v.push("burma".to_owned()); + v.push("shave".to_owned()); + assert_eq!( + &*v, + &[ + "hello".to_owned(), + "there".to_owned(), + "burma".to_owned(), + "shave".to_owned(), + "hello".to_owned(), + "there".to_owned(), + "burma".to_owned(), + "shave".to_owned(), + ][..] + ); +} + +/// https://github.com/servo/rust-smallvec/issues/4 +#[test] +fn issue_4() { + SmallVec::<[Box; 2]>::new(); +} + +/// https://github.com/servo/rust-smallvec/issues/5 +#[test] +fn issue_5() { + assert!(Some(SmallVec::<[&u32; 2]>::new()).is_some()); +} + +#[test] +fn test_with_capacity() { + let v: SmallVec<[u8; 3]> = SmallVec::with_capacity(1); + assert!(v.is_empty()); + assert!(!v.spilled()); + assert_eq!(v.capacity(), 3); + + let v: SmallVec<[u8; 3]> = SmallVec::with_capacity(10); + assert!(v.is_empty()); + assert!(v.spilled()); + assert_eq!(v.capacity(), 10); +} + +#[test] +fn drain() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + assert_eq!(v.drain(..).collect::>(), &[3]); + + // spilling the vec + v.push(3); + v.push(4); + v.push(5); + let old_capacity = v.capacity(); + assert_eq!(v.drain(1..).collect::>(), &[4, 5]); + // drain should not change the capacity + assert_eq!(v.capacity(), old_capacity); +} + +#[test] +fn drain_rev() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + assert_eq!(v.drain(..).rev().collect::>(), &[3]); + + // spilling the vec + v.push(3); + v.push(4); + v.push(5); + assert_eq!(v.drain(..).rev().collect::>(), &[5, 4, 3]); +} + +#[test] +fn drain_forget() { + let mut v: SmallVec<[u8; 1]> = smallvec![0, 1, 2, 3, 4, 5, 6, 7]; + std::mem::forget(v.drain(2..5)); + assert_eq!(v.len(), 2); +} + +#[test] +fn into_iter() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + assert_eq!(v.into_iter().collect::>(), &[3]); + + // spilling the vec + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + v.push(4); + v.push(5); + assert_eq!(v.into_iter().collect::>(), &[3, 4, 5]); +} + +#[test] +fn into_iter_rev() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + assert_eq!(v.into_iter().rev().collect::>(), &[3]); + + // spilling the vec + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(3); + v.push(4); + v.push(5); + assert_eq!(v.into_iter().rev().collect::>(), &[5, 4, 3]); +} + +#[test] +fn into_iter_drop() { + use std::cell::Cell; + + struct DropCounter<'a>(&'a Cell); + + impl<'a> Drop for DropCounter<'a> { + fn drop(&mut self) { + self.0.set(self.0.get() + 1); + } + } + + { + let cell = Cell::new(0); + let mut v: SmallVec<[DropCounter<'_>; 2]> = SmallVec::new(); + v.push(DropCounter(&cell)); + v.into_iter(); + assert_eq!(cell.get(), 1); + } + + { + let cell = Cell::new(0); + let mut v: SmallVec<[DropCounter<'_>; 2]> = SmallVec::new(); + v.push(DropCounter(&cell)); + v.push(DropCounter(&cell)); + assert!(v.into_iter().next().is_some()); + assert_eq!(cell.get(), 2); + } + + { + let cell = Cell::new(0); + let mut v: SmallVec<[DropCounter<'_>; 2]> = SmallVec::new(); + v.push(DropCounter(&cell)); + v.push(DropCounter(&cell)); + v.push(DropCounter(&cell)); + assert!(v.into_iter().next().is_some()); + assert_eq!(cell.get(), 3); + } + { + let cell = Cell::new(0); + let mut v: SmallVec<[DropCounter<'_>; 2]> = SmallVec::new(); + v.push(DropCounter(&cell)); + v.push(DropCounter(&cell)); + v.push(DropCounter(&cell)); + { + let mut it = v.into_iter(); + assert!(it.next().is_some()); + assert!(it.next_back().is_some()); + } + assert_eq!(cell.get(), 3); + } +} + +#[test] +fn test_capacity() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.reserve(1); + assert_eq!(v.capacity(), 2); + assert!(!v.spilled()); + + v.reserve_exact(0x100); + assert!(v.capacity() >= 0x100); + + v.push(0); + v.push(1); + v.push(2); + v.push(3); + + v.shrink_to_fit(); + assert!(v.capacity() < 0x100); +} + +#[test] +fn test_truncate() { + let mut v: SmallVec<[Box; 8]> = SmallVec::new(); + + for x in 0..8 { + v.push(Box::new(x)); + } + v.truncate(4); + + assert_eq!(v.len(), 4); + assert!(!v.spilled()); + + assert_eq!(*v.swap_remove(1), 1); + assert_eq!(*v.remove(1), 3); + v.insert(1, Box::new(3)); + + assert_eq!(&v.iter().map(|v| **v).collect::>(), &[0, 3, 2]); +} + +#[test] +fn test_insert_many() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + for x in 0..4 { + v.push(x); + } + assert_eq!(v.len(), 4); + v.insert_many(1, [5, 6].iter().cloned()); + assert_eq!( + &v.iter().map(|v| *v).collect::>(), + &[0, 5, 6, 1, 2, 3] + ); +} + +struct MockHintIter { + x: T, + hint: usize, +} +impl Iterator for MockHintIter { + type Item = T::Item; + fn next(&mut self) -> Option { + self.x.next() + } + fn size_hint(&self) -> (usize, Option) { + (self.hint, None) + } +} + +#[test] +fn test_insert_many_short_hint() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + for x in 0..4 { + v.push(x); + } + assert_eq!(v.len(), 4); + v.insert_many( + 1, + MockHintIter { + x: [5, 6].iter().cloned(), + hint: 5, + }, + ); + assert_eq!( + &v.iter().map(|v| *v).collect::>(), + &[0, 5, 6, 1, 2, 3] + ); +} + +#[test] +fn test_insert_many_long_hint() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + for x in 0..4 { + v.push(x); + } + assert_eq!(v.len(), 4); + v.insert_many( + 1, + MockHintIter { + x: [5, 6].iter().cloned(), + hint: 1, + }, + ); + assert_eq!( + &v.iter().map(|v| *v).collect::>(), + &[0, 5, 6, 1, 2, 3] + ); +} + +// https://github.com/servo/rust-smallvec/issues/96 +mod insert_many_panic { + use crate::{smallvec, SmallVec}; + use alloc::boxed::Box; + + struct PanicOnDoubleDrop { + dropped: Box, + } + + impl PanicOnDoubleDrop { + fn new() -> Self { + Self { + dropped: Box::new(false), + } + } + } + + impl Drop for PanicOnDoubleDrop { + fn drop(&mut self) { + assert!(!*self.dropped, "already dropped"); + *self.dropped = true; + } + } + + /// Claims to yield `hint` items, but actually yields `count`, then panics. + struct BadIter { + hint: usize, + count: usize, + } + + impl Iterator for BadIter { + type Item = PanicOnDoubleDrop; + fn size_hint(&self) -> (usize, Option) { + (self.hint, None) + } + fn next(&mut self) -> Option { + if self.count == 0 { + panic!() + } + self.count -= 1; + Some(PanicOnDoubleDrop::new()) + } + } + + #[test] + fn panic_early_at_start() { + let mut vec: SmallVec<[PanicOnDoubleDrop; 0]> = + smallvec![PanicOnDoubleDrop::new(), PanicOnDoubleDrop::new(),]; + let result = ::std::panic::catch_unwind(move || { + vec.insert_many(0, BadIter { hint: 1, count: 0 }); + }); + assert!(result.is_err()); + } + + #[test] + fn panic_early_in_middle() { + let mut vec: SmallVec<[PanicOnDoubleDrop; 0]> = + smallvec![PanicOnDoubleDrop::new(), PanicOnDoubleDrop::new(),]; + let result = ::std::panic::catch_unwind(move || { + vec.insert_many(1, BadIter { hint: 4, count: 2 }); + }); + assert!(result.is_err()); + } + + #[test] + fn panic_early_at_end() { + let mut vec: SmallVec<[PanicOnDoubleDrop; 0]> = + smallvec![PanicOnDoubleDrop::new(), PanicOnDoubleDrop::new(),]; + let result = ::std::panic::catch_unwind(move || { + vec.insert_many(2, BadIter { hint: 3, count: 1 }); + }); + assert!(result.is_err()); + } + + #[test] + fn panic_late_at_start() { + let mut vec: SmallVec<[PanicOnDoubleDrop; 0]> = + smallvec![PanicOnDoubleDrop::new(), PanicOnDoubleDrop::new(),]; + let result = ::std::panic::catch_unwind(move || { + vec.insert_many(0, BadIter { hint: 3, count: 5 }); + }); + assert!(result.is_err()); + } + + #[test] + fn panic_late_at_end() { + let mut vec: SmallVec<[PanicOnDoubleDrop; 0]> = + smallvec![PanicOnDoubleDrop::new(), PanicOnDoubleDrop::new(),]; + let result = ::std::panic::catch_unwind(move || { + vec.insert_many(2, BadIter { hint: 3, count: 5 }); + }); + assert!(result.is_err()); + } +} + +#[test] +#[should_panic] +fn test_invalid_grow() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + v.extend(0..8); + v.grow(5); +} + +#[test] +fn test_insert_from_slice() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + for x in 0..4 { + v.push(x); + } + assert_eq!(v.len(), 4); + v.insert_from_slice(1, &[5, 6]); + assert_eq!( + &v.iter().map(|v| *v).collect::>(), + &[0, 5, 6, 1, 2, 3] + ); +} + +#[test] +fn test_extend_from_slice() { + let mut v: SmallVec<[u8; 8]> = SmallVec::new(); + for x in 0..4 { + v.push(x); + } + assert_eq!(v.len(), 4); + v.extend_from_slice(&[5, 6]); + assert_eq!( + &v.iter().map(|v| *v).collect::>(), + &[0, 1, 2, 3, 5, 6] + ); +} + +#[test] +#[should_panic] +fn test_drop_panic_smallvec() { + // This test should only panic once, and not double panic, + // which would mean a double drop + struct DropPanic; + + impl Drop for DropPanic { + fn drop(&mut self) { + panic!("drop"); + } + } + + let mut v = SmallVec::<[_; 1]>::new(); + v.push(DropPanic); +} + +#[test] +fn test_eq() { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + let mut b: SmallVec<[u32; 2]> = SmallVec::new(); + let mut c: SmallVec<[u32; 2]> = SmallVec::new(); + // a = [1, 2] + a.push(1); + a.push(2); + // b = [1, 2] + b.push(1); + b.push(2); + // c = [3, 4] + c.push(3); + c.push(4); + + assert!(a == b); + assert!(a != c); +} + +#[test] +fn test_ord() { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + let mut b: SmallVec<[u32; 2]> = SmallVec::new(); + let mut c: SmallVec<[u32; 2]> = SmallVec::new(); + // a = [1] + a.push(1); + // b = [1, 1] + b.push(1); + b.push(1); + // c = [1, 2] + c.push(1); + c.push(2); + + assert!(a < b); + assert!(b > a); + assert!(b < c); + assert!(c > b); +} + +#[test] +fn test_hash() { + use std::collections::hash_map::DefaultHasher; + use std::hash::Hash; + + { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + let b = [1, 2]; + a.extend(b.iter().cloned()); + let mut hasher = DefaultHasher::new(); + assert_eq!(a.hash(&mut hasher), b.hash(&mut hasher)); + } + { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + let b = [1, 2, 11, 12]; + a.extend(b.iter().cloned()); + let mut hasher = DefaultHasher::new(); + assert_eq!(a.hash(&mut hasher), b.hash(&mut hasher)); + } +} + +#[test] +fn test_as_ref() { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + a.push(1); + assert_eq!(a.as_ref(), [1]); + a.push(2); + assert_eq!(a.as_ref(), [1, 2]); + a.push(3); + assert_eq!(a.as_ref(), [1, 2, 3]); +} + +#[test] +fn test_as_mut() { + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + a.push(1); + assert_eq!(a.as_mut(), [1]); + a.push(2); + assert_eq!(a.as_mut(), [1, 2]); + a.push(3); + assert_eq!(a.as_mut(), [1, 2, 3]); + a.as_mut()[1] = 4; + assert_eq!(a.as_mut(), [1, 4, 3]); +} + +#[test] +fn test_borrow() { + use std::borrow::Borrow; + + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + a.push(1); + assert_eq!(a.borrow(), [1]); + a.push(2); + assert_eq!(a.borrow(), [1, 2]); + a.push(3); + assert_eq!(a.borrow(), [1, 2, 3]); +} + +#[test] +fn test_borrow_mut() { + use std::borrow::BorrowMut; + + let mut a: SmallVec<[u32; 2]> = SmallVec::new(); + a.push(1); + assert_eq!(a.borrow_mut(), [1]); + a.push(2); + assert_eq!(a.borrow_mut(), [1, 2]); + a.push(3); + assert_eq!(a.borrow_mut(), [1, 2, 3]); + BorrowMut::<[u32]>::borrow_mut(&mut a)[1] = 4; + assert_eq!(a.borrow_mut(), [1, 4, 3]); +} + +#[test] +fn test_from() { + assert_eq!(&SmallVec::<[u32; 2]>::from(&[1][..])[..], [1]); + assert_eq!(&SmallVec::<[u32; 2]>::from(&[1, 2, 3][..])[..], [1, 2, 3]); + + let vec = vec![]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from(vec); + assert_eq!(&*small_vec, &[]); + drop(small_vec); + + let vec = vec![1, 2, 3, 4, 5]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from(vec); + assert_eq!(&*small_vec, &[1, 2, 3, 4, 5]); + drop(small_vec); + + let vec = vec![1, 2, 3, 4, 5]; + let small_vec: SmallVec<[u8; 1]> = SmallVec::from(vec); + assert_eq!(&*small_vec, &[1, 2, 3, 4, 5]); + drop(small_vec); + + let array = [1]; + let small_vec: SmallVec<[u8; 1]> = SmallVec::from(array); + assert_eq!(&*small_vec, &[1]); + drop(small_vec); + + let array = [99; 128]; + let small_vec: SmallVec<[u8; 128]> = SmallVec::from(array); + assert_eq!(&*small_vec, vec![99u8; 128].as_slice()); + drop(small_vec); +} + +#[test] +fn test_from_slice() { + assert_eq!(&SmallVec::<[u32; 2]>::from_slice(&[1][..])[..], [1]); + assert_eq!( + &SmallVec::<[u32; 2]>::from_slice(&[1, 2, 3][..])[..], + [1, 2, 3] + ); +} + +#[test] +fn test_exact_size_iterator() { + let mut vec = SmallVec::<[u32; 2]>::from(&[1, 2, 3][..]); + assert_eq!(vec.clone().into_iter().len(), 3); + assert_eq!(vec.drain(..2).len(), 2); + assert_eq!(vec.into_iter().len(), 1); +} + +#[test] +fn test_into_iter_as_slice() { + let vec = SmallVec::<[u32; 2]>::from(&[1, 2, 3][..]); + let mut iter = vec.clone().into_iter(); + assert_eq!(iter.as_slice(), &[1, 2, 3]); + assert_eq!(iter.as_mut_slice(), &[1, 2, 3]); + iter.next(); + assert_eq!(iter.as_slice(), &[2, 3]); + assert_eq!(iter.as_mut_slice(), &[2, 3]); + iter.next_back(); + assert_eq!(iter.as_slice(), &[2]); + assert_eq!(iter.as_mut_slice(), &[2]); +} + +#[test] +fn test_into_iter_clone() { + // Test that the cloned iterator yields identical elements and that it owns its own copy + // (i.e. no use after move errors). + let mut iter = SmallVec::<[u8; 2]>::from_iter(0..3).into_iter(); + let mut clone_iter = iter.clone(); + while let Some(x) = iter.next() { + assert_eq!(x, clone_iter.next().unwrap()); + } + assert_eq!(clone_iter.next(), None); +} + +#[test] +fn test_into_iter_clone_partially_consumed_iterator() { + // Test that the cloned iterator only contains the remaining elements of the original iterator. + let mut iter = SmallVec::<[u8; 2]>::from_iter(0..3).into_iter().skip(1); + let mut clone_iter = iter.clone(); + while let Some(x) = iter.next() { + assert_eq!(x, clone_iter.next().unwrap()); + } + assert_eq!(clone_iter.next(), None); +} + +#[test] +fn test_into_iter_clone_empty_smallvec() { + let mut iter = SmallVec::<[u8; 2]>::new().into_iter(); + let mut clone_iter = iter.clone(); + assert_eq!(iter.next(), None); + assert_eq!(clone_iter.next(), None); +} + +#[test] +fn shrink_to_fit_unspill() { + let mut vec = SmallVec::<[u8; 2]>::from_iter(0..3); + vec.pop(); + assert!(vec.spilled()); + vec.shrink_to_fit(); + assert!(!vec.spilled(), "shrink_to_fit will un-spill if possible"); +} + +#[test] +fn test_into_vec() { + let vec = SmallVec::<[u8; 2]>::from_iter(0..2); + assert_eq!(vec.into_vec(), vec![0, 1]); + + let vec = SmallVec::<[u8; 2]>::from_iter(0..3); + assert_eq!(vec.into_vec(), vec![0, 1, 2]); +} + +#[test] +fn test_into_inner() { + let vec = SmallVec::<[u8; 2]>::from_iter(0..2); + assert_eq!(vec.into_inner(), Ok([0, 1])); + + let vec = SmallVec::<[u8; 2]>::from_iter(0..1); + assert_eq!(vec.clone().into_inner(), Err(vec)); + + let vec = SmallVec::<[u8; 2]>::from_iter(0..3); + assert_eq!(vec.clone().into_inner(), Err(vec)); +} + +#[test] +fn test_from_vec() { + let vec = vec![]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[]); + drop(small_vec); + + let vec = vec![]; + let small_vec: SmallVec<[u8; 1]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[]); + drop(small_vec); + + let vec = vec![1]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[1]); + drop(small_vec); + + let vec = vec![1, 2, 3]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[1, 2, 3]); + drop(small_vec); + + let vec = vec![1, 2, 3, 4, 5]; + let small_vec: SmallVec<[u8; 3]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[1, 2, 3, 4, 5]); + drop(small_vec); + + let vec = vec![1, 2, 3, 4, 5]; + let small_vec: SmallVec<[u8; 1]> = SmallVec::from_vec(vec); + assert_eq!(&*small_vec, &[1, 2, 3, 4, 5]); + drop(small_vec); +} + +#[test] +fn test_retain() { + // Test inline data storate + let mut sv: SmallVec<[i32; 5]> = SmallVec::from_slice(&[1, 2, 3, 3, 4]); + sv.retain(|&mut i| i != 3); + assert_eq!(sv.pop(), Some(4)); + assert_eq!(sv.pop(), Some(2)); + assert_eq!(sv.pop(), Some(1)); + assert_eq!(sv.pop(), None); + + // Test spilled data storage + let mut sv: SmallVec<[i32; 3]> = SmallVec::from_slice(&[1, 2, 3, 3, 4]); + sv.retain(|&mut i| i != 3); + assert_eq!(sv.pop(), Some(4)); + assert_eq!(sv.pop(), Some(2)); + assert_eq!(sv.pop(), Some(1)); + assert_eq!(sv.pop(), None); + + // Test that drop implementations are called for inline. + let one = Rc::new(1); + let mut sv: SmallVec<[Rc; 3]> = SmallVec::new(); + sv.push(Rc::clone(&one)); + assert_eq!(Rc::strong_count(&one), 2); + sv.retain(|_| false); + assert_eq!(Rc::strong_count(&one), 1); + + // Test that drop implementations are called for spilled data. + let mut sv: SmallVec<[Rc; 1]> = SmallVec::new(); + sv.push(Rc::clone(&one)); + sv.push(Rc::new(2)); + assert_eq!(Rc::strong_count(&one), 2); + sv.retain(|_| false); + assert_eq!(Rc::strong_count(&one), 1); +} + +#[test] +fn test_dedup() { + let mut dupes: SmallVec<[i32; 5]> = SmallVec::from_slice(&[1, 1, 2, 3, 3]); + dupes.dedup(); + assert_eq!(&*dupes, &[1, 2, 3]); + + let mut empty: SmallVec<[i32; 5]> = SmallVec::new(); + empty.dedup(); + assert!(empty.is_empty()); + + let mut all_ones: SmallVec<[i32; 5]> = SmallVec::from_slice(&[1, 1, 1, 1, 1]); + all_ones.dedup(); + assert_eq!(all_ones.len(), 1); + + let mut no_dupes: SmallVec<[i32; 5]> = SmallVec::from_slice(&[1, 2, 3, 4, 5]); + no_dupes.dedup(); + assert_eq!(no_dupes.len(), 5); +} + +#[test] +fn test_resize() { + let mut v: SmallVec<[i32; 8]> = SmallVec::new(); + v.push(1); + v.resize(5, 0); + assert_eq!(v[..], [1, 0, 0, 0, 0][..]); + + v.resize(2, -1); + assert_eq!(v[..], [1, 0][..]); +} + +#[cfg(feature = "write")] +#[test] +fn test_write() { + use std::io::Write; + + let data = [1, 2, 3, 4, 5]; + + let mut small_vec: SmallVec<[u8; 2]> = SmallVec::new(); + let len = small_vec.write(&data[..]).unwrap(); + assert_eq!(len, 5); + assert_eq!(small_vec.as_ref(), data.as_ref()); + + let mut small_vec: SmallVec<[u8; 2]> = SmallVec::new(); + small_vec.write_all(&data[..]).unwrap(); + assert_eq!(small_vec.as_ref(), data.as_ref()); +} + +#[cfg(feature = "serde")] +extern crate bincode; + +#[cfg(feature = "serde")] +#[test] +fn test_serde() { + use self::bincode::{config, deserialize}; + let mut small_vec: SmallVec<[i32; 2]> = SmallVec::new(); + small_vec.push(1); + let encoded = config().limit(100).serialize(&small_vec).unwrap(); + let decoded: SmallVec<[i32; 2]> = deserialize(&encoded).unwrap(); + assert_eq!(small_vec, decoded); + small_vec.push(2); + // Spill the vec + small_vec.push(3); + small_vec.push(4); + // Check again after spilling. + let encoded = config().limit(100).serialize(&small_vec).unwrap(); + let decoded: SmallVec<[i32; 2]> = deserialize(&encoded).unwrap(); + assert_eq!(small_vec, decoded); +} + +#[test] +fn grow_to_shrink() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(1); + v.push(2); + v.push(3); + assert!(v.spilled()); + v.clear(); + // Shrink to inline. + v.grow(2); + assert!(!v.spilled()); + assert_eq!(v.capacity(), 2); + assert_eq!(v.len(), 0); + v.push(4); + assert_eq!(v[..], [4]); +} + +#[test] +fn resumable_extend() { + let s = "a b c"; + // This iterator yields: (Some('a'), None, Some('b'), None, Some('c')), None + let it = s + .chars() + .scan(0, |_, ch| if ch.is_whitespace() { None } else { Some(ch) }); + let mut v: SmallVec<[char; 4]> = SmallVec::new(); + v.extend(it); + assert_eq!(v[..], ['a']); +} + +// #139 +#[test] +fn uninhabited() { + enum Void {} + let _sv = SmallVec::<[Void; 8]>::new(); +} + +#[test] +fn grow_spilled_same_size() { + let mut v: SmallVec<[u8; 2]> = SmallVec::new(); + v.push(0); + v.push(1); + v.push(2); + assert!(v.spilled()); + assert_eq!(v.capacity(), 4); + // grow with the same capacity + v.grow(4); + assert_eq!(v.capacity(), 4); + assert_eq!(v[..], [0, 1, 2]); +} + +#[cfg(feature = "const_generics")] +#[test] +fn const_generics() { + let _v = SmallVec::<[i32; 987]>::default(); +} + +#[test] +fn empty_macro() { + let _v: SmallVec<[u8; 1]> = smallvec![]; +} + +#[test] +fn zero_size_items() { + SmallVec::<[(); 0]>::new().push(()); +} -- cgit v1.2.3