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|
mod control_flow;
use core::ops::{Bound, Range, RangeFrom, RangeFull, RangeInclusive, RangeTo, RangeToInclusive};
use core::ops::{Deref, DerefMut};
// Test the Range structs and syntax.
#[test]
fn test_range() {
let r = Range { start: 2, end: 10 };
let mut count = 0;
for (i, ri) in r.enumerate() {
assert_eq!(ri, i + 2);
assert!(ri >= 2 && ri < 10);
count += 1;
}
assert_eq!(count, 8);
}
#[test]
fn test_range_from() {
let r = RangeFrom { start: 2 };
let mut count = 0;
for (i, ri) in r.take(10).enumerate() {
assert_eq!(ri, i + 2);
assert!(ri >= 2 && ri < 12);
count += 1;
}
assert_eq!(count, 10);
}
#[test]
fn test_range_to() {
// Not much to test.
let _ = RangeTo { end: 42 };
}
#[test]
fn test_full_range() {
// Not much to test.
let _ = RangeFull;
}
#[test]
fn test_range_inclusive() {
let mut r = RangeInclusive::new(1i8, 2);
assert_eq!(r.next(), Some(1));
assert_eq!(r.next(), Some(2));
assert_eq!(r.next(), None);
r = RangeInclusive::new(127i8, 127);
assert_eq!(r.next(), Some(127));
assert_eq!(r.next(), None);
r = RangeInclusive::new(-128i8, -128);
assert_eq!(r.next_back(), Some(-128));
assert_eq!(r.next_back(), None);
// degenerate
r = RangeInclusive::new(1, -1);
assert_eq!(r.size_hint(), (0, Some(0)));
assert_eq!(r.next(), None);
}
#[test]
fn test_range_to_inclusive() {
// Not much to test.
let _ = RangeToInclusive { end: 42 };
}
#[test]
fn test_range_is_empty() {
assert!(!(0.0..10.0).is_empty());
assert!((-0.0..0.0).is_empty());
assert!((10.0..0.0).is_empty());
assert!(!(f32::NEG_INFINITY..f32::INFINITY).is_empty());
assert!((f32::EPSILON..f32::NAN).is_empty());
assert!((f32::NAN..f32::EPSILON).is_empty());
assert!((f32::NAN..f32::NAN).is_empty());
assert!(!(0.0..=10.0).is_empty());
assert!(!(-0.0..=0.0).is_empty());
assert!((10.0..=0.0).is_empty());
assert!(!(f32::NEG_INFINITY..=f32::INFINITY).is_empty());
assert!((f32::EPSILON..=f32::NAN).is_empty());
assert!((f32::NAN..=f32::EPSILON).is_empty());
assert!((f32::NAN..=f32::NAN).is_empty());
}
#[test]
fn test_bound_cloned_unbounded() {
assert_eq!(Bound::<&u32>::Unbounded.cloned(), Bound::Unbounded);
}
#[test]
fn test_bound_cloned_included() {
assert_eq!(Bound::Included(&3).cloned(), Bound::Included(3));
}
#[test]
fn test_bound_cloned_excluded() {
assert_eq!(Bound::Excluded(&3).cloned(), Bound::Excluded(3));
}
#[test]
#[allow(unused_comparisons)]
#[allow(unused_mut)]
fn test_range_syntax() {
let mut count = 0;
for i in 0_usize..10 {
assert!(i >= 0 && i < 10);
count += i;
}
assert_eq!(count, 45);
let mut count = 0;
let mut range = 0_usize..10;
for i in range {
assert!(i >= 0 && i < 10);
count += i;
}
assert_eq!(count, 45);
let mut count = 0;
let mut rf = 3_usize..;
for i in rf.take(10) {
assert!(i >= 3 && i < 13);
count += i;
}
assert_eq!(count, 75);
let _ = 0_usize..4 + 4 - 3;
fn foo() -> isize {
42
}
let _ = 0..foo();
let _ = { &42..&100 }; // references to literals are OK
let _ = ..42_usize;
// Test we can use two different types with a common supertype.
let x = &42;
{
let y = 42;
let _ = x..&y;
}
}
#[test]
#[allow(dead_code)]
fn test_range_syntax_in_return_statement() {
fn return_range_to() -> RangeTo<i32> {
return ..1;
}
fn return_full_range() -> RangeFull {
return ..;
}
// Not much to test.
}
#[test]
fn range_structural_match() {
// test that all range types can be structurally matched upon
const RANGE: Range<usize> = 0..1000;
match RANGE {
RANGE => {}
_ => unreachable!(),
}
const RANGE_FROM: RangeFrom<usize> = 0..;
match RANGE_FROM {
RANGE_FROM => {}
_ => unreachable!(),
}
const RANGE_FULL: RangeFull = ..;
match RANGE_FULL {
RANGE_FULL => {}
}
const RANGE_INCLUSIVE: RangeInclusive<usize> = 0..=999;
match RANGE_INCLUSIVE {
RANGE_INCLUSIVE => {}
_ => unreachable!(),
}
const RANGE_TO: RangeTo<usize> = ..1000;
match RANGE_TO {
RANGE_TO => {}
_ => unreachable!(),
}
const RANGE_TO_INCLUSIVE: RangeToInclusive<usize> = ..=999;
match RANGE_TO_INCLUSIVE {
RANGE_TO_INCLUSIVE => {}
_ => unreachable!(),
}
}
// Test Deref implementations
#[test]
fn deref_mut_on_ref() {
// Test that `&mut T` implements `DerefMut<T>`
fn inc<T: Deref<Target = isize> + DerefMut>(mut t: T) {
*t += 1;
}
let mut x: isize = 5;
inc(&mut x);
assert_eq!(x, 6);
}
#[test]
fn deref_on_ref() {
// Test that `&T` and `&mut T` implement `Deref<T>`
fn deref<U: Copy, T: Deref<Target = U>>(t: T) -> U {
*t
}
let x: isize = 3;
let y = deref(&x);
assert_eq!(y, 3);
let mut x: isize = 4;
let y = deref(&mut x);
assert_eq!(y, 4);
}
#[test]
#[allow(unreachable_code)]
fn test_not_never() {
if !return () {}
}
|
