1 files changed, 58 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-missing-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-missing-target-is-proxy.js
new file mode 100644
index 0000000000..3c440dfd72
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-missing-target-is-proxy.js
@@ -0,0 +1,58 @@
+// 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-delete-p
+description: >
+  If "deleteProperty" trap is null or undefined, [[Delete]] call is
+  properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[Delete]] ( P )
+
+  [...]
+  5. Let target be O.[[ProxyTarget]].
+  6. Let trap be ? GetMethod(handler, "deleteProperty").
+  7. If trap is undefined, then
+    a. Return ? target.[[Delete]](P).
+features: [Proxy, Reflect]
+---*/
+
+var plainObject = {
+  get foo() {},
+};
+
+Object.defineProperty(plainObject, "bar", {
+  configurable: false,
+});
+
+var plainObjectTarget = new Proxy(plainObject, {});
+var plainObjectProxy = new Proxy(plainObjectTarget, {});
+
+assert(delete plainObjectProxy.foo);
+assert(
+  !Object.prototype.hasOwnProperty.call(plainObject, "foo"),
+  "'foo' property was deleted from original object"
+);
+
+assert(!Reflect.deleteProperty(plainObjectProxy, "bar"));
+assert(
+  Object.prototype.hasOwnProperty.call(plainObject, "bar"),
+  "'bar' property was not deleted from original object"
+);
+
+var func = function() {};
+var funcTarget = new Proxy(func, {});
+var funcProxy = new Proxy(funcTarget, {});
+
+assert(delete funcProxy.length);
+assert(
+  !Object.prototype.hasOwnProperty.call(func, "length"),
+  "'length' property was deleted from original object"
+);
+
+assert.throws(TypeError, function() {
+  "use strict";
+  delete funcProxy.prototype;
+});
+
+reportCompare(0, 0);