Add tests for computed __proto__ property keys (#916)

Fixes #904

1 files changed, 54 insertions, 0 deletions

diff --git a/test/annexB/language/expressions/object/__proto__-duplicate-computed.js b/test/annexB/language/expressions/object/__proto__-duplicate-computed.js
new file mode 100644
index 000000000..838511019
--- /dev/null
+++ b/test/annexB/language/expressions/object/__proto__-duplicate-computed.js
@@ -0,0 +1,54 @@
+// 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-__proto__-property-names-in-object-initializers
+es6id: B.3.1
+description: >
+    The syntax error for duplicate `__proto__` property is not valid if the duplicate is a
+    ComputedPropertyName
+info: |
+    B.3.1__proto__ Property Names in Object Initializers
+
+    It is a Syntax Error if PropertyNameList of PropertyDefinitionList contains any duplicate
+    entries for  "__proto__" and at least two of those entries were obtained from productions of
+    the form
+    PropertyDefinition : PropertyName : AssignmentExpression .
+
+    12.2.6.6 Static Semantics: PropertyNameList
+
+    ...
+    3. Append PropName of PropertyDefinition to the end of list.
+    ...
+
+    12.2.6.5 Static Semantics: PropName
+
+    ComputedPropertyName : [ AssignmentExpression ]
+        1. Return empty.
+---*/
+
+var obj;
+var proto = {};
+var ownProp = {};
+
+obj = {
+    __proto__: proto,
+    ['__proto__']: {},
+    ['__proto__']: ownProp
+};
+
+assert.sameValue(
+    Object.getPrototypeOf(obj),
+    proto,
+    'prototype is defined'
+);
+
+assert(
+    Object.hasOwnProperty.call(obj, '__proto__'),
+    'has own property __proto__'
+);
+
+assert.sameValue(
+    obj.__proto__,
+    ownProp,
+    'own property value'
+);