1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Object/getOwnPropertySymbols/proxy-invariant-duplicate-string-entry.js b/js/src/tests/test262/built-ins/Object/getOwnPropertySymbols/proxy-invariant-duplicate-string-entry.js
new file mode 100644
index 0000000000..7ce3773702
--- /dev/null
+++ b/js/src/tests/test262/built-ins/Object/getOwnPropertySymbols/proxy-invariant-duplicate-string-entry.js
@@ -0,0 +1,37 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-object.getownpropertysymbols
+description: >
+  Proxy [[OwnPropertyKeys]] trap does not skip string keys when validating invariant:
+  * The returned List contains no duplicate entries.
+info: |
+  Object.getOwnPropertySymbols ( O )
+
+  1. Return ? GetOwnPropertyKeys(O, Symbol).
+
+  GetOwnPropertyKeys ( O, type )
+
+  ...
+  2. Let keys be ? obj.[[OwnPropertyKeys]]().
+
+  [[OwnPropertyKeys]] ( )
+
+  ...
+  8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
+  9. If trapResult contains any duplicate entries, throw a TypeError exception.
+features: [Proxy]
+---*/
+
+var proxy = new Proxy({}, {
+  ownKeys: function() {
+    return ['a', 'a'];
+  },
+});
+
+assert.throws(TypeError, function() {
+  Object.getOwnPropertySymbols(proxy);
+});
+
+reportCompare(0, 0);