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52 lines
1.5 KiB
52 lines
1.5 KiB
mod util {
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use std::future::Future;
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use std::fmt::Debug;
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pub fn assert_done<T, F>(actual_fut: F, expected: T)
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where
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T: PartialEq + Debug,
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F: FnOnce() -> Box<dyn Future<Output = T> + Unpin>,
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{
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use futures::executor::block_on;
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let output = block_on(actual_fut());
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assert_eq!(output, expected);
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}
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}
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#[test]
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fn collect_collects() {
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use futures_util::future::{join_all,ready};
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util::assert_done(|| Box::new(join_all(vec![ready(1), ready(2)])), vec![1, 2]);
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util::assert_done(|| Box::new(join_all(vec![ready(1)])), vec![1]);
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// REVIEW: should this be implemented?
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// assert_done(|| Box::new(join_all(Vec::<i32>::new())), vec![]);
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// TODO: needs more tests
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}
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#[test]
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fn join_all_iter_lifetime() {
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use futures_util::future::{join_all,ready};
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use std::future::Future;
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// In futures-rs version 0.1, this function would fail to typecheck due to an overly
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// conservative type parameterization of `JoinAll`.
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fn sizes(bufs: Vec<&[u8]>) -> Box<dyn Future<Output = Vec<usize>> + Unpin> {
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let iter = bufs.into_iter().map(|b| ready::<usize>(b.len()));
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Box::new(join_all(iter))
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}
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util::assert_done(|| sizes(vec![&[1,2,3], &[], &[0]]), vec![3_usize, 0, 1]);
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}
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#[test]
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fn join_all_from_iter() {
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use futures_util::future::{JoinAll,ready};
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util::assert_done(
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|| Box::new(vec![ready(1), ready(2)].into_iter().collect::<JoinAll<_>>()),
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vec![1, 2],
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)
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}
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