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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
pub fn op1() -> Result<isize, &'static str> { Ok(666) }
pub fn op2() -> Result<isize, &'static str> { Err("sadface") }
#[test]
pub fn test_and() {
assert_eq!(op1().and(Ok(667)).unwrap(), 667);
assert_eq!(op1().and(Err::<i32, &'static str>("bad")).unwrap_err(),
"bad");
assert_eq!(op2().and(Ok(667)).unwrap_err(), "sadface");
assert_eq!(op2().and(Err::<i32,&'static str>("bad")).unwrap_err(),
"sadface");
}
#[test]
pub fn test_and_then() {
assert_eq!(op1().and_then(|i| Ok::<isize, &'static str>(i + 1)).unwrap(), 667);
assert_eq!(op1().and_then(|_| Err::<isize, &'static str>("bad")).unwrap_err(),
"bad");
assert_eq!(op2().and_then(|i| Ok::<isize, &'static str>(i + 1)).unwrap_err(),
"sadface");
assert_eq!(op2().and_then(|_| Err::<isize, &'static str>("bad")).unwrap_err(),
"sadface");
}
#[test]
pub fn test_or() {
assert_eq!(op1().or(Ok::<_, &'static str>(667)).unwrap(), 666);
assert_eq!(op1().or(Err("bad")).unwrap(), 666);
assert_eq!(op2().or(Ok::<_, &'static str>(667)).unwrap(), 667);
assert_eq!(op2().or(Err("bad")).unwrap_err(), "bad");
}
#[test]
pub fn test_or_else() {
assert_eq!(op1().or_else(|_| Ok::<isize, &'static str>(667)).unwrap(), 666);
assert_eq!(op1().or_else(|e| Err::<isize, &'static str>(e)).unwrap(), 666);
assert_eq!(op2().or_else(|_| Ok::<isize, &'static str>(667)).unwrap(), 667);
assert_eq!(op2().or_else(|e| Err::<isize, &'static str>(e)).unwrap_err(),
"sadface");
}
#[test]
pub fn test_impl_map() {
assert!(Ok::<isize, isize>(1).map(|x| x + 1) == Ok(2));
assert!(Err::<isize, isize>(1).map(|x| x + 1) == Err(1));
}
#[test]
pub fn test_impl_map_err() {
assert!(Ok::<isize, isize>(1).map_err(|x| x + 1) == Ok(1));
assert!(Err::<isize, isize>(1).map_err(|x| x + 1) == Err(2));
}
/* FIXME(#20575)
#[test]
fn test_collect() {
let v: Result<Vec<isize>, ()> = (0..0).map(|_| Ok::<isize, ()>(0)).collect();
assert!(v == Ok(vec![]));
let v: Result<Vec<isize>, ()> = (0..3).map(|x| Ok::<isize, ()>(x)).collect();
assert!(v == Ok(vec![0, 1, 2]));
let v: Result<Vec<isize>, isize> = (0..3).map(|x| {
if x > 1 { Err(x) } else { Ok(x) }
}).collect();
assert!(v == Err(2));
// test that it does not take more elements than it needs
let mut functions: [Box<Fn() -> Result<(), isize>>; 3] =
[box || Ok(()), box || Err(1), box || panic!()];
let v: Result<Vec<()>, isize> = functions.iter_mut().map(|f| (*f)()).collect();
assert!(v == Err(1));
}
*/
#[test]
pub fn test_fmt_default() {
let ok: Result<isize, &'static str> = Ok(100);
let err: Result<isize, &'static str> = Err("Err");
let s = format!("{:?}", ok);
assert_eq!(s, "Ok(100)");
let s = format!("{:?}", err);
assert_eq!(s, "Err(\"Err\")");
}
#[test]
pub fn test_unwrap_or() {
let ok: Result<isize, &'static str> = Ok(100);
let ok_err: Result<isize, &'static str> = Err("Err");
assert_eq!(ok.unwrap_or(50), 100);
assert_eq!(ok_err.unwrap_or(50), 50);
}
#[test]
pub fn test_unwrap_or_else() {
fn handler(msg: &'static str) -> isize {
if msg == "I got this." {
50
} else {
panic!("BadBad")
}
}
let ok: Result<isize, &'static str> = Ok(100);
let ok_err: Result<isize, &'static str> = Err("I got this.");
assert_eq!(ok.unwrap_or_else(handler), 100);
assert_eq!(ok_err.unwrap_or_else(handler), 50);
}
#[test]
#[should_panic]
pub fn test_unwrap_or_else_panic() {
fn handler(msg: &'static str) -> isize {
if msg == "I got this." {
50
} else {
panic!("BadBad")
}
}
let bad_err: Result<isize, &'static str> = Err("Unrecoverable mess.");
let _ : isize = bad_err.unwrap_or_else(handler);
}
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