1 files changed, 53 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor.js b/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor.js
new file mode 100644
index 0000000000..e8c2c1948f
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Array/fromAsync/this-constructor.js
@@ -0,0 +1,53 @@
+// |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: >
+  Constructs the this-value once if asyncItems is iterable, twice if not, and
+  length and element properties are set correctly on the result
+info: |
+  3.e. If IsConstructor(_C_) is *true*, then
+    i. Let _A_ be ? Construct(_C_).
+  ...
+  j. If _iteratorRecord_ is not *undefined*, then
+    ...
+  k. Else,
+    ...
+    iv. If IsConstructor(_C_) is *true*, then
+      1. Let _A_ be ? Construct(_C_, « 𝔽(_len_) »).
+includes: [compareArray.js, asyncHelpers.js]
+flags: [async]
+features: [Array.fromAsync]
+---*/
+
+asyncTest(async function () {
+  const constructorCalls = [];
+
+  function MyArray(...args) {
+    constructorCalls.push(args);
+  }
+
+  let result = await Array.fromAsync.call(MyArray, [1, 2]);
+  assert(result instanceof MyArray, "result is an instance of the constructor this-value");
+  assert.sameValue(result.length, 2, "length is set on result");
+  assert.sameValue(result[0], 1, "element 0 is set on result");
+  assert.sameValue(result[1], 2, "element 1 is set on result");
+  assert.sameValue(constructorCalls.length, 1, "constructor is called once");
+  assert.compareArray(constructorCalls[0], [], "constructor is called with no arguments");
+
+  constructorCalls.splice(0);  // reset
+
+  result = await Array.fromAsync.call(MyArray, {
+    length: 2,
+    0: 1,
+    1: 2
+  });
+  assert(result instanceof MyArray, "result is an instance of the constructor this-value");
+  assert.sameValue(result.length, 2, "length is set on result");
+  assert.sameValue(result[0], 1, "element 0 is set on result");
+  assert.sameValue(result[1], 2, "element 1 is set on result");
+  assert.sameValue(constructorCalls.length, 1, "constructor is called once");
+  assert.compareArray(constructorCalls[0], [2], "constructor is called with a length argument");
+});