futures: Add a test for creating multiple futures from the same promise

alexcrichton · Feb 4, 2019 · e20c406 · e20c406
1 parent bf8a380
commit e20c406
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/crates/futures/tests/tests.rs b/crates/futures/tests/tests.rs
@@ -108,3 +108,10 @@ fn spawn_local_err_no_exception() -> impl Future<Item = (), Error = JsValue> {
     })
 }
 
+#[wasm_bindgen_test(async)]
+fn can_create_multiple_futures_from_same_promise() -> impl Future<Item = (), Error = JsValue> {
+    let promise = js_sys::Promise::resolve(&JsValue::null());
+    let a = JsFuture::from(promise.clone());
+    let b = JsFuture::from(promise);
+    futures::future::join_all(vec![a, b]).map(|_| ())
+}