1 files changed, 51 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/set/trap-is-null-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/set/trap-is-null-target-is-proxy.js
new file mode 100644
index 0000000000..4687576ddd
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/set/trap-is-null-target-is-proxy.js
@@ -0,0 +1,51 @@
+// 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-set-p-v-receiver
+description: >
+  If "set" trap is null or undefined, [[Set]] call is properly
+  forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[Set]] ( P, V, Receiver )
+
+  [...]
+  5. Let target be O.[[ProxyTarget]].
+  6. Let trap be ? GetMethod(handler, "set").
+  7. If trap is undefined, then
+    a. Return ? target.[[Set]](P, V, Receiver).
+features: [Proxy, Reflect]
+includes: [compareArray.js]
+---*/
+
+var array = [1, 2, 3];
+var arrayTarget = new Proxy(array, {});
+var arrayProxy = new Proxy(arrayTarget, {
+  set: null,
+});
+
+arrayProxy.length = 0;
+assert.compareArray(array, []);
+
+Object.preventExtensions(array);
+
+assert(!Reflect.set(arrayProxy, "foo", 2));
+assert.throws(TypeError, function() {
+  "use strict";
+  arrayProxy[0] = 3;
+});
+
+
+var string = new String("str");
+var stringTarget = new Proxy(string, {});
+var stringProxy = new Proxy(stringTarget, {
+  set: null,
+});
+
+stringProxy[4] = 1;
+assert.sameValue(string[4], 1);
+
+assert(!Reflect.set(stringProxy, "0", "s"));
+assert(!Reflect.set(stringProxy, "length", 3));
+
+reportCompare(0, 0);