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diff --git a/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined-target-is-proxy.js
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+++ b/js/src/tests/test262/built-ins/Proxy/isExtensible/trap-is-undefined-target-is-proxy.js
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+// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-proxy-object-internal-methods-and-internal-slots-isextensible
+description: >
+ If "isExtensible" trap is null or undefined, [[IsExtensible]] call is
+ properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+ [[IsExtensible]] ( )
+
+ [...]
+ 4. Let target be O.[[ProxyTarget]].
+ 5. Let trap be ? GetMethod(handler, "isExtensible").
+ 6. If trap is undefined, then
+ a. Return ? IsExtensible(target).
+
+ IsExtensible ( O )
+
+ 1. Assert: Type(O) is Object.
+ 2. Return ? O.[[IsExtensible]]().
+
+ [[IsExtensible]] ( )
+
+ [...]
+ 7. Let booleanTrapResult be ! ToBoolean(? Call(trap, handler, « target »)).
+ [...]
+ 10. Return booleanTrapResult.
+features: [Proxy]
+---*/
+
+var array = [];
+var arrayExtensible = true;
+var arrayTarget = new Proxy(array, {
+ isExtensible: function() {
+ return arrayExtensible;
+ },
+});
+
+var arrayProxy = new Proxy(arrayTarget, {
+ isExtensible: undefined,
+});
+
+assert(Object.isExtensible(arrayProxy));
+
+Object.preventExtensions(array);
+arrayExtensible = false;
+
+assert(!Object.isExtensible(arrayProxy));
+
+reportCompare(0, 0);