diff options
Diffstat (limited to 'tests/mpsc.rs')
-rw-r--r-- | tests/mpsc.rs | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tests/mpsc.rs b/tests/mpsc.rs index 444c8e1..f5d7198 100644 --- a/tests/mpsc.rs +++ b/tests/mpsc.rs @@ -632,3 +632,26 @@ fn send_backpressure_multi_senders() { let item = block_on(rx.next()).unwrap(); assert_eq!(item, 2); } + +/// Test that empty channel has zero length and that non-empty channel has length equal to number +/// of enqueued items +#[test] +fn unbounded_len() { + let (tx, mut rx) = mpsc::unbounded(); + assert_eq!(tx.len(), 0); + assert!(tx.is_empty()); + tx.unbounded_send(1).unwrap(); + assert_eq!(tx.len(), 1); + assert!(!tx.is_empty()); + tx.unbounded_send(2).unwrap(); + assert_eq!(tx.len(), 2); + assert!(!tx.is_empty()); + let item = block_on(rx.next()).unwrap(); + assert_eq!(item, 1); + assert_eq!(tx.len(), 1); + assert!(!tx.is_empty()); + let item = block_on(rx.next()).unwrap(); + assert_eq!(item, 2); + assert_eq!(tx.len(), 0); + assert!(tx.is_empty()); +} |