1 files changed, 42 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Proxy/ownKeys/trap-is-undefined-target-is-proxy.js b/js/src/tests/test262/built-ins/Proxy/ownKeys/trap-is-undefined-target-is-proxy.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/Proxy/ownKeys/trap-is-undefined-target-is-proxy.js
@@ -0,0 +1,42 @@
+// 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-ownpropertykeys
+description: >
+  If "ownKeys" trap is null or undefined, [[OwnPropertyKeys]] call is
+  properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
+info: |
+  [[OwnPropertyKeys]] ( )
+
+  [...]
+  4. Let target be O.[[ProxyTarget]].
+  5. Let trap be ? GetMethod(handler, "ownKeys").
+  6. If trap is undefined, then
+    a. Return ? target.[[OwnPropertyKeys]]().
+
+  [[OwnPropertyKeys]] ( )
+
+  [...]
+  7. Let trapResultArray be ? Call(trap, handler, « target »).
+  8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
+  [...]
+  23. Return trapResult.
+includes: [compareArray.js]
+features: [Symbol, Proxy, Reflect]
+---*/
+
+var trapResult = [Symbol(), "length", "foo", "0"];
+var target = new Proxy([], {
+  ownKeys: function(_target) {
+    return trapResult;
+  },
+});
+
+var proxy = new Proxy(target, {
+  ownKeys: undefined,
+});
+
+assert.compareArray(Reflect.ownKeys(proxy), trapResult);
+
+reportCompare(0, 0);