1 files changed, 43 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-null-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-null-target-is-proxy.js
new file mode 100644
index 0000000000..3ba8d7b741
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-null-target-is-proxy.js
@@ -0,0 +1,43 @@
+// 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 stringTarget = new Proxy(new String("str"), {});
+var stringProxy = new Proxy(stringTarget, {
+  deleteProperty: null,
+});
+
+assert(!Reflect.deleteProperty(stringProxy, "length"));
+assert.throws(TypeError, function() {
+  "use strict";
+  delete stringProxy[0];
+});
+
+
+var regExpTarget = new Proxy(/(?:)/g, {});
+var regExpProxy = new Proxy(regExpTarget, {
+  deleteProperty: null,
+});
+
+assert(delete regExpProxy.foo);
+assert.throws(TypeError, function() {
+  "use strict";
+  delete regExpProxy.lastIndex;
+});
+
+reportCompare(0, 0);