1 files changed, 50 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/defineProperty/trap-is-missing-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/defineProperty/trap-is-missing-target-is-proxy.js
new file mode 100644
index 0000000000..0731dd58bb
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/defineProperty/trap-is-missing-target-is-proxy.js
@@ -0,0 +1,50 @@
+// 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-defineownproperty-p-desc
+description: >
+  If "defineProperty" trap is null or undefined, [[DefineOwnProperty]] call
+  is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[DefineOwnProperty]] (P, Desc)
+
+  [...]
+  5. Let target be O.[[ProxyTarget]].
+  6. Let trap be ? GetMethod(handler, "defineProperty").
+  7. If trap is undefined, then
+    a. Return ? target.[[DefineOwnProperty]](P, Desc).
+features: [Proxy, Reflect]
+---*/
+
+var string = new String("str");
+var stringTarget = new Proxy(string, {});
+var stringProxy = new Proxy(stringTarget, {});
+
+assert(Reflect.defineProperty(stringProxy, "4", {value: 4}));
+assert.sameValue(string[4], 4);
+
+assert.throws(TypeError, function() {
+  Object.defineProperty(stringProxy, "0", {
+    value: "x",
+  });
+});
+
+Object.preventExtensions(string);
+assert(!Reflect.defineProperty(stringProxy, "foo", {value: 5}));
+
+
+var func = function() {};
+var funcTarget = new Proxy(func, {});
+var funcProxy = new Proxy(funcTarget, {});
+
+Object.defineProperty(funcProxy, "name", {value: "foo"});
+assert.sameValue(func.name, "foo");
+
+assert.throws(TypeError, function() {
+  Object.defineProperty(funcProxy, "prototype", {
+    set: function(_value) {},
+  });
+});
+
+reportCompare(0, 0);