From 6e08f579a665d7d73750e3dafb0d2d2a94bb3b2a Mon Sep 17 00:00:00 2001
From: lcnr/Bastian Kauschke <bastian_kauschke@hotmail.de>
Date: Mon, 14 Jan 2019 21:04:29 +0100
Subject: [PATCH] add temporary test

---
 crates/futures/tests/tests.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/crates/futures/tests/tests.rs b/crates/futures/tests/tests.rs
index 7b76dfe5..e8e6bbf4 100644
--- a/crates/futures/tests/tests.rs
+++ b/crates/futures/tests/tests.rs
@@ -86,3 +86,25 @@ fn spawn_local_runs() -> impl Future<Item = (), Error = JsValue> {
         }
     })
 }
+
+/// check that `spawn_local` does not forward the `future::err` as an unchecked rejection
+#[wasm_bindgen_test(async)]
+fn spawn_local_err_no_exception() -> impl Future<Item = (), Error = JsValue> {
+    let (tx, rx) = oneshot::channel::<u32>();
+    let fn_box = Box::new(move || {
+        tx.send(42).unwrap();
+    });
+    // Promises should run in a deterministic order, so the `err` should be handled during the execution of this test.
+    spawn_local(futures::future::err::<(), ()>(()));
+    spawn_local(futures::future::ok::<(), ()>(()).map(|_| {
+        fn_box();
+    }));
+    rx.then(|val| {
+        if val == Ok(42) {
+            Ok(())
+        } else {
+            Err(JsValue::undefined())
+        }
+    })
+}
+