diff options
Diffstat (limited to 'tokio/tests/stream_chain.rs')
-rw-r--r-- | tokio/tests/stream_chain.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tokio/tests/stream_chain.rs b/tokio/tests/stream_chain.rs index 0e14618b..98461a8c 100644 --- a/tokio/tests/stream_chain.rs +++ b/tokio/tests/stream_chain.rs @@ -69,3 +69,27 @@ async fn pending_first() { assert_eq!(stream.size_hint(), (0, None)); assert_eq!(None, assert_ready!(stream.poll_next())); } + +#[test] +fn size_overflow() { + struct Monster; + + impl tokio::stream::Stream for Monster { + type Item = (); + fn poll_next( + self: std::pin::Pin<&mut Self>, + _cx: &mut std::task::Context<'_>, + ) -> std::task::Poll<Option<()>> { + panic!() + } + + fn size_hint(&self) -> (usize, Option<usize>) { + (usize::max_value(), Some(usize::max_value())) + } + } + + let m1 = Monster; + let m2 = Monster; + let m = m1.chain(m2); + assert_eq!(m.size_hint(), (usize::max_value(), None)); +} |