1 files changed, 24 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Set/prototype/isSubsetOf/set-like-array.js b/js/src/tests/test262/built-ins/Set/prototype/isSubsetOf/set-like-array.js
new file mode 100644
index 0000000000..caad7df291
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Set/prototype/isSubsetOf/set-like-array.js
@@ -0,0 +1,24 @@
+// |reftest| skip -- set-methods is not supported
+// Copyright (C) 2023 Anthony Frehner and Kevin Gibbons. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-set.prototype.issubsetof
+description: Set.prototype.isSubsetOf consumes a set-like array as a set-like, not an array
+features: [set-methods]
+---*/
+
+const s1 = new Set([1, 2]);
+const s2 = [5, 6];
+s2.size = 3;
+s2.has = function (v) {
+  if (v === 1) return true;
+  if (v === 2) return true;
+  throw new Test262Error("Set.prototype.isSubsetOf should only call its argument's has method with contents of this");
+};
+s2.keys = function () {
+  throw new Test262Error("Set.prototype.isSubsetOf should not call its argument's keys iterator when this.size ≤ arg.size");
+};
+
+assert.sameValue(s1.isSubsetOf(s2), true);
+
+reportCompare(0, 0);