1 files changed, 54 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-undefined-target-is-proxy.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Proxy/deleteProperty/trap-is-undefined-target-is-proxy.js
@@ -0,0 +1,54 @@
+// 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 array = [1];
+var arrayTarget = new Proxy(array, {});
+var arrayProxy = new Proxy(arrayTarget, {
+  deleteProperty: undefined,
+});
+
+assert(delete arrayProxy[0]);
+assert(!array.hasOwnProperty("0"));
+
+assert(!Reflect.deleteProperty(arrayProxy, "length"));
+assert.sameValue(array.length, 1);
+
+
+var trapCalls = 0;
+var target = new Proxy({}, {
+  deleteProperty: function(_target, key) {
+    trapCalls++;
+    return key === "foo";
+  },
+});
+
+var proxy = new Proxy(target, {
+  deleteProperty: undefined,
+});
+
+assert(delete proxy.foo);
+assert.sameValue(trapCalls, 1);
+
+assert.throws(TypeError, function() {
+  "use strict";
+  delete proxy.bar;
+});
+assert.sameValue(trapCalls, 2);
+
+reportCompare(0, 0);