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-rw-r--r--js/src/tests/test262/built-ins/Proxy/preventExtensions/trap-is-missing-target-is-proxy.js32
1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/preventExtensions/trap-is-missing-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/preventExtensions/trap-is-missing-target-is-proxy.js
new file mode 100644
index 0000000000..908029e0a4
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+++ b/js/src/tests/test262/built-ins/Proxy/preventExtensions/trap-is-missing-target-is-proxy.js
@@ -0,0 +1,32 @@
+// 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-preventextensions
+description: >
+ If "preventExtensions" trap is null or undefined, [[PreventExtensions]] call
+ is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+ [[PreventExtensions]] ( )
+
+ [...]
+ 4. Let target be O.[[ProxyTarget]].
+ 5. Let trap be ? GetMethod(handler, "preventExtensions").
+ 6. If trap is undefined, then
+ a. Return ? target.[[PreventExtensions]]().
+features: [Proxy]
+---*/
+
+var target = new Proxy({}, {
+ preventExtensions: function(_target) {
+ return false;
+ },
+});
+
+var proxy = new Proxy(target, {});
+
+assert.throws(TypeError, function() {
+ Object.preventExtensions(proxy);
+});
+
+reportCompare(0, 0);