375 lines
8.6 KiB
Rust
375 lines
8.6 KiB
Rust
use core::clone::Clone;
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use core::mem;
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use core::ops::DerefMut;
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use core::option::*;
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#[test]
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fn test_get_ptr() {
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unsafe {
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let x: Box<_> = box 0;
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let addr_x: *const isize = mem::transmute(&*x);
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let opt = Some(x);
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let y = opt.unwrap();
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let addr_y: *const isize = mem::transmute(&*y);
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assert_eq!(addr_x, addr_y);
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}
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}
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#[test]
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fn test_get_str() {
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let x = "test".to_string();
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let addr_x = x.as_ptr();
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let opt = Some(x);
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let y = opt.unwrap();
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let addr_y = y.as_ptr();
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assert_eq!(addr_x, addr_y);
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}
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#[test]
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fn test_get_resource() {
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use core::cell::RefCell;
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use std::rc::Rc;
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struct R {
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i: Rc<RefCell<isize>>,
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}
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impl Drop for R {
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fn drop(&mut self) {
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let ii = &*self.i;
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let i = *ii.borrow();
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*ii.borrow_mut() = i + 1;
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}
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}
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fn r(i: Rc<RefCell<isize>>) -> R {
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R { i }
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}
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let i = Rc::new(RefCell::new(0));
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{
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let x = r(i.clone());
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let opt = Some(x);
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let _y = opt.unwrap();
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}
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assert_eq!(*i.borrow(), 1);
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}
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#[test]
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fn test_option_dance() {
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let x = Some(());
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let mut y = Some(5);
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let mut y2 = 0;
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for _x in x {
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y2 = y.take().unwrap();
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}
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assert_eq!(y2, 5);
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assert!(y.is_none());
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}
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#[test]
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#[should_panic]
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fn test_option_too_much_dance() {
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struct A;
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let mut y = Some(A);
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let _y2 = y.take().unwrap();
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let _y3 = y.take().unwrap();
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}
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#[test]
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fn test_and() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.and(Some(2)), Some(2));
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assert_eq!(x.and(None::<isize>), None);
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let x: Option<isize> = None;
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assert_eq!(x.and(Some(2)), None);
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assert_eq!(x.and(None::<isize>), None);
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}
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#[test]
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fn test_and_then() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.and_then(|x| Some(x + 1)), Some(2));
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assert_eq!(x.and_then(|_| None::<isize>), None);
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let x: Option<isize> = None;
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assert_eq!(x.and_then(|x| Some(x + 1)), None);
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assert_eq!(x.and_then(|_| None::<isize>), None);
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}
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#[test]
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fn test_or() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.or(Some(2)), Some(1));
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assert_eq!(x.or(None), Some(1));
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let x: Option<isize> = None;
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assert_eq!(x.or(Some(2)), Some(2));
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assert_eq!(x.or(None), None);
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}
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#[test]
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fn test_or_else() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.or_else(|| Some(2)), Some(1));
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assert_eq!(x.or_else(|| None), Some(1));
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let x: Option<isize> = None;
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assert_eq!(x.or_else(|| Some(2)), Some(2));
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assert_eq!(x.or_else(|| None), None);
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}
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#[test]
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fn test_unwrap() {
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assert_eq!(Some(1).unwrap(), 1);
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let s = Some("hello".to_string()).unwrap();
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assert_eq!(s, "hello");
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}
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#[test]
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#[should_panic]
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fn test_unwrap_panic1() {
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let x: Option<isize> = None;
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x.unwrap();
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}
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#[test]
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#[should_panic]
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fn test_unwrap_panic2() {
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let x: Option<String> = None;
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x.unwrap();
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}
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#[test]
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fn test_unwrap_or() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.unwrap_or(2), 1);
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let x: Option<isize> = None;
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assert_eq!(x.unwrap_or(2), 2);
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}
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#[test]
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fn test_unwrap_or_else() {
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let x: Option<isize> = Some(1);
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assert_eq!(x.unwrap_or_else(|| 2), 1);
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let x: Option<isize> = None;
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assert_eq!(x.unwrap_or_else(|| 2), 2);
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}
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#[test]
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fn test_iter() {
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let val = 5;
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let x = Some(val);
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let mut it = x.iter();
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assert_eq!(it.size_hint(), (1, Some(1)));
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assert_eq!(it.next(), Some(&val));
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assert_eq!(it.size_hint(), (0, Some(0)));
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assert!(it.next().is_none());
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let mut it = (&x).into_iter();
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assert_eq!(it.next(), Some(&val));
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}
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#[test]
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fn test_mut_iter() {
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let mut val = 5;
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let new_val = 11;
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let mut x = Some(val);
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{
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let mut it = x.iter_mut();
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assert_eq!(it.size_hint(), (1, Some(1)));
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match it.next() {
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Some(interior) => {
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assert_eq!(*interior, val);
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*interior = new_val;
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}
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None => assert!(false),
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}
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assert_eq!(it.size_hint(), (0, Some(0)));
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assert!(it.next().is_none());
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}
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assert_eq!(x, Some(new_val));
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let mut y = Some(val);
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let mut it = (&mut y).into_iter();
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assert_eq!(it.next(), Some(&mut val));
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}
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#[test]
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fn test_ord() {
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let small = Some(1.0f64);
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let big = Some(5.0f64);
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let nan = Some(0.0f64 / 0.0);
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assert!(!(nan < big));
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assert!(!(nan > big));
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assert!(small < big);
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assert!(None < big);
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assert!(big > None);
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}
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#[test]
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fn test_collect() {
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let v: Option<Vec<isize>> = (0..0).map(|_| Some(0)).collect();
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assert!(v == Some(vec![]));
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let v: Option<Vec<isize>> = (0..3).map(|x| Some(x)).collect();
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assert!(v == Some(vec![0, 1, 2]));
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let v: Option<Vec<isize>> = (0..3).map(|x| if x > 1 { None } else { Some(x) }).collect();
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assert!(v == None);
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// test that it does not take more elements than it needs
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let mut functions: [Box<dyn Fn() -> Option<()>>; 3] =
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[box || Some(()), box || None, box || panic!()];
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let v: Option<Vec<()>> = functions.iter_mut().map(|f| (*f)()).collect();
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assert!(v == None);
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}
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#[test]
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fn test_copied() {
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let val = 1;
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let val_ref = &val;
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let opt_none: Option<&'static u32> = None;
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let opt_ref = Some(&val);
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let opt_ref_ref = Some(&val_ref);
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// None works
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assert_eq!(opt_none.clone(), None);
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assert_eq!(opt_none.copied(), None);
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// Immutable ref works
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assert_eq!(opt_ref.clone(), Some(&val));
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assert_eq!(opt_ref.copied(), Some(1));
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// Double Immutable ref works
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assert_eq!(opt_ref_ref.clone(), Some(&val_ref));
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assert_eq!(opt_ref_ref.clone().copied(), Some(&val));
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assert_eq!(opt_ref_ref.copied().copied(), Some(1));
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}
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#[test]
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fn test_cloned() {
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let val = 1;
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let val_ref = &val;
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let opt_none: Option<&'static u32> = None;
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let opt_ref = Some(&val);
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let opt_ref_ref = Some(&val_ref);
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// None works
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assert_eq!(opt_none.clone(), None);
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assert_eq!(opt_none.cloned(), None);
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// Immutable ref works
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assert_eq!(opt_ref.clone(), Some(&val));
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assert_eq!(opt_ref.cloned(), Some(1));
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// Double Immutable ref works
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assert_eq!(opt_ref_ref.clone(), Some(&val_ref));
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assert_eq!(opt_ref_ref.clone().cloned(), Some(&val));
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assert_eq!(opt_ref_ref.cloned().cloned(), Some(1));
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}
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#[test]
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fn test_try() {
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fn try_option_some() -> Option<u8> {
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let val = Some(1)?;
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Some(val)
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}
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assert_eq!(try_option_some(), Some(1));
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fn try_option_none() -> Option<u8> {
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let val = None?;
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Some(val)
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}
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assert_eq!(try_option_none(), None);
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fn try_option_ok() -> Result<u8, NoneError> {
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let val = Some(1)?;
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Ok(val)
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}
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assert_eq!(try_option_ok(), Ok(1));
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fn try_option_err() -> Result<u8, NoneError> {
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let val = None?;
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Ok(val)
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}
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assert_eq!(try_option_err(), Err(NoneError));
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}
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#[test]
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fn test_option_as_deref() {
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// Some: &Option<T: Deref>::Some(T) -> Option<&T::Deref::Target>::Some(&*T)
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let ref_option = &Some(&42);
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assert_eq!(ref_option.as_deref(), Some(&42));
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let ref_option = &Some(String::from("a result"));
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assert_eq!(ref_option.as_deref(), Some("a result"));
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let ref_option = &Some(vec![1, 2, 3, 4, 5]);
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assert_eq!(ref_option.as_deref(), Some([1, 2, 3, 4, 5].as_slice()));
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// None: &Option<T: Deref>>::None -> None
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let ref_option: &Option<&i32> = &None;
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assert_eq!(ref_option.as_deref(), None);
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}
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#[test]
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fn test_option_as_deref_mut() {
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// Some: &mut Option<T: Deref>::Some(T) -> Option<&mut T::Deref::Target>::Some(&mut *T)
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let mut val = 42;
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let ref_option = &mut Some(&mut val);
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assert_eq!(ref_option.as_deref_mut(), Some(&mut 42));
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let ref_option = &mut Some(String::from("a result"));
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assert_eq!(ref_option.as_deref_mut(), Some(String::from("a result").deref_mut()));
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let ref_option = &mut Some(vec![1, 2, 3, 4, 5]);
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assert_eq!(ref_option.as_deref_mut(), Some([1, 2, 3, 4, 5].as_mut_slice()));
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// None: &mut Option<T: Deref>>::None -> None
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let ref_option: &mut Option<&mut i32> = &mut None;
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assert_eq!(ref_option.as_deref_mut(), None);
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}
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#[test]
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fn test_replace() {
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let mut x = Some(2);
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let old = x.replace(5);
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assert_eq!(x, Some(5));
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assert_eq!(old, Some(2));
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let mut x = None;
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let old = x.replace(3);
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assert_eq!(x, Some(3));
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assert_eq!(old, None);
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}
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#[test]
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fn option_const() {
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// test that the methods of `Option` are usable in a const context
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const OPTION: Option<usize> = Some(32);
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const REF: Option<&usize> = OPTION.as_ref();
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assert_eq!(REF, Some(&32));
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const IS_SOME: bool = OPTION.is_some();
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assert!(IS_SOME);
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const IS_NONE: bool = OPTION.is_none();
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assert!(!IS_NONE);
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}
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