From 9e88bb9a45ee8fc5e75f097f5c39857da27d023a Mon Sep 17 00:00:00 2001
From: Rick Waldron <waldron.rick@gmail.com>
Date: Fri, 4 Aug 2017 11:59:05 -0400
Subject: [PATCH] Proxy, [[OwnPropertyKeys]]: If trapResult contains any
 duplicate entries, throw a TypeError

Ref: https://github.com/tc39/ecma262/pull/833
---
 .../return-duplicate-entries-throws.js        | 22 ++++++++++++++++++
 .../return-duplicate-symbol-entries-throws.js | 23 +++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 test/built-ins/Proxy/ownKeys/return-duplicate-entries-throws.js
 create mode 100644 test/built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws.js

diff --git a/test/built-ins/Proxy/ownKeys/return-duplicate-entries-throws.js b/test/built-ins/Proxy/ownKeys/return-duplicate-entries-throws.js
new file mode 100644
index 0000000000..8bd1512d03
--- /dev/null
+++ b/test/built-ins/Proxy/ownKeys/return-duplicate-entries-throws.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2017 the V8 project authors. 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: >
+    The returned list must not contain any duplicate entries.
+info: >
+    [[OwnPropertyKeys]] ( )
+
+    ...
+    9. If trapResult contains any duplicate entries, throw a TypeError exception.
+---*/
+
+var p = new Proxy({}, {
+  ownKeys() {
+    return ["a", "a"];
+  }
+});
+
+assert.throws(TypeError, function() {
+  Object.keys(p);
+});
diff --git a/test/built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws.js b/test/built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws.js
new file mode 100644
index 0000000000..dfe27205c0
--- /dev/null
+++ b/test/built-ins/Proxy/ownKeys/return-duplicate-symbol-entries-throws.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2017 the V8 project authors. 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: >
+    The returned list must not contain any duplicate entries.
+info: >
+    [[OwnPropertyKeys]] ( )
+
+    ...
+    9. If trapResult contains any duplicate entries, throw a TypeError exception.
+---*/
+
+var s = Symbol();
+var p = new Proxy({}, {
+  ownKeys() {
+    return [s, s];
+  }
+});
+
+assert.throws(TypeError, function() {
+  Object.keys(p);
+});