1 files changed, 40 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-throws-close-async-iterator.js b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-throws-close-async-iterator.js
new file mode 100644
index 0000000000..a351445f1d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-sync-throws-close-async-iterator.js
@@ -0,0 +1,40 @@
+// |reftest| async
+// Copyright (C) 2023 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.fromasync
+description: >
+  The iterator of an asynchronous iterable is closed when the synchronous
+  mapping function throws.
+info: |
+  3.j.ii.6. If _mapping_ is *true*, then
+    a. Let _mappedValue_ be Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
+    b. IfAbruptCloseAsyncIterator(_mappedValue_, _iteratorRecord_).
+    ...
+flags: [async]
+includes: [asyncHelpers.js]
+features: [Array.fromAsync]
+---*/
+
+let closed = false;
+const iterator = {
+  next() {
+    return Promise.resolve({ value: 1, done: false });
+  },
+  return() {
+    closed = true;
+    return Promise.resolve({ done: true });
+  },
+  [Symbol.asyncIterator]() {
+    return this;
+  }
+}
+
+asyncTest(async () => {
+  await assert.throwsAsync(Error, () => Array.fromAsync(iterator, (val) => {
+    assert.sameValue(val, 1, "mapfn receives value from iterator");
+    throw new Error("mapfn throws");
+  }), "sync mapfn throwing should cause fromAsync to reject");
+  assert(closed, "sync mapfn throwing should close iterator")
+});