1 files changed, 26 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Set/prototype/intersection/subclass.js b/js/src/tests/test262/built-ins/Set/prototype/intersection/subclass.js
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index 0000000000..5fae153a2b
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+++ b/js/src/tests/test262/built-ins/Set/prototype/intersection/subclass.js
@@ -0,0 +1,26 @@
+// |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.intersection
+description: Set.prototype.intersection works on subclasses of Set, but returns an instance of Set
+features: [set-methods]
+includes: [compareArray.js]
+---*/
+
+class MySet extends Set {}
+
+const s1 = new MySet([1, 2]);
+const s2 = new Set([2, 3]);
+const expected = [2];
+const combined = s1.intersection(s2);
+
+assert.compareArray([...combined], expected);
+assert.sameValue(combined instanceof Set, true, "The returned object is a Set");
+assert.sameValue(
+  combined instanceof MySet,
+  false,
+  "The returned object is a Set, not a subclass"
+);
+
+reportCompare(0, 0);