use futures::future::{self, FutureExt, TryFutureExt};
use futures_test::future::FutureTestExt;
use std::sync::mpsc;
#[test]
fn basic_future_combinators() {
let (tx1, rx) = mpsc::channel();
let tx2 = tx1.clone();
let tx3 = tx1.clone();
let fut = future::ready(1)
.then(move |x| {
tx1.send(x).unwrap(); tx1.send(2).unwrap(); future::ready(3)
}).map(move |x| {
tx2.send(x).unwrap(); tx2.send(4).unwrap(); 5
}).map(move |x| {
tx3.send(x).unwrap(); });
assert!(rx.try_recv().is_err()); fut.run_in_background(); for i in 1..=5 { assert_eq!(rx.recv(), Ok(i)); } assert!(rx.recv().is_err()); }
#[test]
fn basic_try_future_combinators() {
let (tx1, rx) = mpsc::channel();
let tx2 = tx1.clone();
let tx3 = tx1.clone();
let tx4 = tx1.clone();
let tx5 = tx1.clone();
let tx6 = tx1.clone();
let tx7 = tx1.clone();
let tx8 = tx1.clone();
let tx9 = tx1.clone();
let tx10 = tx1.clone();
let fut = future::ready(Ok(1))
.and_then(move |x: i32| {
tx1.send(x).unwrap(); tx1.send(2).unwrap(); future::ready(Ok(3))
})
.or_else(move |x: i32| {
tx2.send(x).unwrap(); tx2.send(-1).unwrap();
future::ready(Ok(-1))
})
.map_ok(move |x: i32| {
tx3.send(x).unwrap(); tx3.send(4).unwrap(); 5
})
.map_err(move |x: i32| {
tx4.send(x).unwrap(); tx4.send(-1).unwrap();
-1
})
.map(move |x: Result<i32, i32>| {
tx5.send(x.unwrap()).unwrap(); tx5.send(6).unwrap(); Err(7) })
.and_then(move |x: i32| {
tx6.send(x).unwrap(); tx6.send(-1).unwrap();
future::ready(Err(-1))
})
.or_else(move |x: i32| {
tx7.send(x).unwrap(); tx7.send(8).unwrap(); future::ready(Err(9))
})
.map_ok(move |x: i32| {
tx8.send(x).unwrap(); tx8.send(-1).unwrap();
-1
})
.map_err(move |x: i32| {
tx9.send(x).unwrap(); tx9.send(10).unwrap(); 11
})
.map(move |x: Result<i32, i32>| {
tx10.send(x.err().unwrap()).unwrap(); tx10.send(12).unwrap(); });
assert!(rx.try_recv().is_err()); fut.run_in_background(); for i in 1..=12 { assert_eq!(rx.recv(), Ok(i)); } assert!(rx.recv().is_err()); }