1 files changed, 33 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/asyncitems-asynciterator-exists.js b/js/src/tests/test262/built-ins/Array/fromAsync/asyncitems-asynciterator-exists.js
new file mode 100644
index 0000000000..7f4511990d
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/fromAsync/asyncitems-asynciterator-exists.js
@@ -0,0 +1,33 @@
+// |reftest| async
+// Copyright (C) 2022 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-array.fromasync
+description: >
+  Array.fromAsync tries the various properties in order
+includes: [asyncHelpers.js, compareArray.js, temporalHelpers.js]
+flags: [async]
+features: [Array.fromAsync]
+---*/
+
+asyncTest(async function () {
+  async function * asyncGen() {
+    for (let i = 0; i < 4; i++) {
+      yield Promise.resolve(i * 2);
+    }
+  }
+
+  const actual = [];
+  const items = {};
+  TemporalHelpers.observeProperty(actual, items, Symbol.asyncIterator, asyncGen, "items");
+  TemporalHelpers.observeProperty(actual, items, Symbol.iterator, undefined, "items");
+  TemporalHelpers.observeProperty(actual, items, "length", 2, "items");
+  TemporalHelpers.observeProperty(actual, items, 0, 2, "items");
+  TemporalHelpers.observeProperty(actual, items, 1, 1, "items");
+  const result = await Array.fromAsync(items);
+  assert.compareArray(result, [0, 2, 4, 6]);
+  assert.compareArray(actual, [
+    "get items[Symbol.asyncIterator]",
+  ]);
+});