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-rw-r--r--js/src/tests/test262/built-ins/Array/fromAsync/mapfn-result-awaited-once-per-iteration.js48
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diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-result-awaited-once-per-iteration.js b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-result-awaited-once-per-iteration.js
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+++ b/js/src/tests/test262/built-ins/Array/fromAsync/mapfn-result-awaited-once-per-iteration.js
@@ -0,0 +1,48 @@
+// |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 returned value from each invocation of the asynchronous mapping function
+ is awaited exactly once.
+info: |
+ 3.j.ii.6. If _mapping_ is *true*, then
+ a. Let _mappedValue_ be Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
+ ...
+ c. Set _mappedValue_ to Await(_mappedValue_).
+flags: [async]
+includes: [asyncHelpers.js, compareArray.js, temporalHelpers.js]
+features: [Array.fromAsync]
+---*/
+
+const calls = [];
+const expected = [
+ "call mapping",
+ "get thenable_0.then",
+ "call thenable_0.then",
+ "call mapping",
+ "get thenable_1.then",
+ "call thenable_1.then",
+ "call mapping",
+ "get thenable_2.then",
+ "call thenable_2.then",
+];
+
+function mapping(val, ix) {
+ calls.push("call mapping");
+ const thenableName = `thenable_${ix}`;
+ return TemporalHelpers.propertyBagObserver(calls, {
+ then(resolve, reject) {
+ calls.push(`call ${thenableName}.then`);
+ resolve(val * 2);
+ }
+ }, thenableName)
+}
+
+asyncTest(async () => {
+ const result = await Array.fromAsync([1, 2, 3], mapping);
+ assert.compareArray(result, [2, 4, 6], "mapping function applied");
+ assert.compareArray(calls, expected, "observable operations");
+});