diff --git a/test/built-ins/Array/prototype/keys/iteration-mutable.js b/test/built-ins/Array/prototype/keys/iteration-mutable.js
index 4f77993b6a5a82c9cf87ef6d40ddff331ffc0652..6b20255cb9cd3cae279b25e45fc8b6ec6a9f211d 100644
--- a/test/built-ins/Array/prototype/keys/iteration-mutable.js
+++ b/test/built-ins/Array/prototype/keys/iteration-mutable.js
@@ -1,15 +1,16 @@
-// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
-
 /*---
-  description: >
-      When an item is added to the array after the iterator is created but
-      before the iterator is "done" (as defined by 22.1.5.2.1), the new item's
-      key should be accessible via iteration. When an item is added to the
-      array after the iterator is "done", the new item's key should not be
-      accessible via iteration.
-  es6id: 22.1.3.13
- ---*/
+es6id: 22.1.3.13
+description: >
+  New items in the array are accessible via iteration until iterator is "done".
+info: >
+  When an item is added to the array after the iterator is created but
+  before the iterator is "done" (as defined by 22.1.5.2.1), the new item's
+  key should be accessible via iteration. When an item is added to the
+  array after the iterator is "done", the new item's key should not be
+  accessible via iteration.
+---*/
 
 var array = [];
 var iterator = array.keys();
@@ -28,5 +29,11 @@ assert.sameValue(result.value, undefined, 'Exhausted result `value`');
 array.push('b');
 
 result = iterator.next();
-assert.sameValue(result.done, true, 'Exhausted result `done` flag (after push)');
-assert.sameValue(result.value, undefined, 'Exhausted result `value` (after push)');
+assert.sameValue(
+  result.done, true,
+  'Exhausted result `done` flag (after push)'
+);
+assert.sameValue(
+  result.value, undefined,
+  'Exhausted result `value` (after push)'
+);
diff --git a/test/built-ins/Array/prototype/keys/iteration.js b/test/built-ins/Array/prototype/keys/iteration.js
index 7e964bbe553e1b8ce4f25b632720f8d876d7a065..e9a71fb57a17b2b2f88ad4345ccb01c301aacc4e 100644
--- a/test/built-ins/Array/prototype/keys/iteration.js
+++ b/test/built-ins/Array/prototype/keys/iteration.js
@@ -1,12 +1,16 @@
-// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
-
 /*---
-  description: >
-      The method should return a valid iterator with the array's numeric
-      properties as the IteratedObject.
-  es6id: 22.1.3.13
- ---*/
+es6id: 22.1.3.13
+description: >
+  The return is a valid iterator with the array's numeric properties.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  1. Let O be ToObject(this value).
+  2. ReturnIfAbrupt(O).
+  3. Return CreateArrayIterator(O, "key").
+---*/
 
 var array = ['a', 'b', 'c'];
 var iterator = array.keys();
diff --git a/test/built-ins/Array/prototype/keys/keys.js b/test/built-ins/Array/prototype/keys/keys.js
new file mode 100644
index 0000000000000000000000000000000000000000..502e66f6362a67e8c6c5910fe74078aa19824b76
--- /dev/null
+++ b/test/built-ins/Array/prototype/keys/keys.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.13
+description: >
+  Property type and descriptor.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  17 ECMAScript Standard Built-in Objects
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  typeof Array.prototype.keys,
+  'function',
+  '`typeof Array.prototype.keys` is `function`'
+);
+
+verifyNotEnumerable(Array.prototype, 'keys');
+verifyWritable(Array.prototype, 'keys');
+verifyConfigurable(Array.prototype, 'keys');
diff --git a/test/built-ins/Array/prototype/keys/length.js b/test/built-ins/Array/prototype/keys/length.js
new file mode 100644
index 0000000000000000000000000000000000000000..0ebabd6fb9a8c7ed8500c6b3b7bd275d9c50b78c
--- /dev/null
+++ b/test/built-ins/Array/prototype/keys/length.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.13
+description: >
+  Array.prototype.keys.length value and descriptor.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  Array.prototype.keys.length, 0,
+  'The value of `Array.prototype.keys.length` is `0`'
+);
+
+verifyNotEnumerable(Array.prototype.keys, 'length');
+verifyNotWritable(Array.prototype.keys, 'length');
+verifyConfigurable(Array.prototype.keys, 'length');
diff --git a/test/built-ins/Array/prototype/keys/name.js b/test/built-ins/Array/prototype/keys/name.js
new file mode 100644
index 0000000000000000000000000000000000000000..2d036f7f7a7c318fec77c150b127a8fb4f203e4b
--- /dev/null
+++ b/test/built-ins/Array/prototype/keys/name.js
@@ -0,0 +1,22 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.13
+description: >
+  Array.prototype.keys.name value and descriptor.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  17 ECMAScript Standard Built-in Objects
+
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(
+  Array.prototype.keys.name, 'keys',
+  'The value of `Array.prototype.keys.name` is `"keys"`'
+);
+
+verifyNotEnumerable(Array.prototype.keys, 'name');
+verifyNotWritable(Array.prototype.keys, 'name');
+verifyConfigurable(Array.prototype.keys, 'name');
diff --git a/test/built-ins/Array/prototype/keys/property-descriptor.js b/test/built-ins/Array/prototype/keys/property-descriptor.js
deleted file mode 100644
index b9d5af2b8205400e6529350b2902700ebd9e1c77..0000000000000000000000000000000000000000
--- a/test/built-ins/Array/prototype/keys/property-descriptor.js
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (C) 2013 the V8 project authors. All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-  description: >
-      The method should exist on the Array prototype, and it should be writable
-      and configurable, but not enumerable.
-  includes: [propertyHelper.js]
-  es6id: 22.1.3.13
- ---*/
-
-verifyNotEnumerable(Array.prototype, 'keys');
-verifyWritable(Array.prototype, 'keys');
-verifyConfigurable(Array.prototype, 'keys');
diff --git a/test/built-ins/Array/prototype/keys/return-abrupt-from-this.js b/test/built-ins/Array/prototype/keys/return-abrupt-from-this.js
new file mode 100644
index 0000000000000000000000000000000000000000..9905e8e4acce92ffe6f60ba14e2823fa228c1c96
--- /dev/null
+++ b/test/built-ins/Array/prototype/keys/return-abrupt-from-this.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.13
+description: >
+  Return abrupt from ToObject(this value).
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  1. Let O be ToObject(this value).
+  2. ReturnIfAbrupt(O).
+---*/
+
+assert.throws(TypeError, function() {
+  Array.prototype.keys.call(undefined);
+});
+
+assert.throws(TypeError, function() {
+  Array.prototype.keys.call(null);
+});
diff --git a/test/built-ins/Array/prototype/keys/returns-iterator-from-object.js b/test/built-ins/Array/prototype/keys/returns-iterator-from-object.js
new file mode 100644
index 0000000000000000000000000000000000000000..d28554bdf9732a36125f76e2df1a09899abf2fed
--- /dev/null
+++ b/test/built-ins/Array/prototype/keys/returns-iterator-from-object.js
@@ -0,0 +1,25 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 22.1.3.13
+description: >
+  Creates an iterator from a custom object.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  1. Let O be ToObject(this value).
+  2. ReturnIfAbrupt(O).
+  3. Return CreateArrayIterator(O, "key").
+features: [Symbol.iterator]
+---*/
+
+var obj = {
+  length: 2
+};
+var iter = Array.prototype.keys.call(obj);
+var ArrayIteratorProto = Object.getPrototypeOf([][Symbol.iterator]());
+
+assert.sameValue(
+  Object.getPrototypeOf(iter), ArrayIteratorProto,
+  'The prototype of [].keys() is %ArrayIteratorPrototype%'
+);
diff --git a/test/built-ins/Array/prototype/keys/returns-iterator.js b/test/built-ins/Array/prototype/keys/returns-iterator.js
index b5a8adee780ee3d0dfd6a0f09e2211bc2b9c53d7..10ce2a580b84fb2f51dea1265eab05fc0171910d 100644
--- a/test/built-ins/Array/prototype/keys/returns-iterator.js
+++ b/test/built-ins/Array/prototype/keys/returns-iterator.js
@@ -1,13 +1,30 @@
-// Copyright (C) 2013 the V8 project authors. All rights reserved.
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.
-
 /*---
-  description: >
-      The method should return an Iterator instance.
-  es6id: 22.1.3.13
- ---*/
+es6id: 22.1.3.13
+description: >
+  The method should return an Iterator instance.
+info: >
+  22.1.3.13 Array.prototype.keys ( )
+
+  1. Let O be ToObject(this value).
+  2. ReturnIfAbrupt(O).
+  3. Return CreateArrayIterator(O, "key").
+
+  22.1.5.1 CreateArrayIterator Abstract Operation
+
+  ...
+  2. Let iterator be ObjectCreate(%ArrayIteratorPrototype%, «‍[[IteratedObject]],
+  [[ArrayIteratorNextIndex]], [[ArrayIterationKind]]»).
+  ...
+  6. Return iterator.
+features: [Symbol.iterator]
+---*/
 
 var ArrayIteratorProto = Object.getPrototypeOf([][Symbol.iterator]());
 var iter = [].keys();
 
-assert.sameValue(Object.getPrototypeOf(iter), ArrayIteratorProto);
+assert.sameValue(
+  Object.getPrototypeOf(iter), ArrayIteratorProto,
+  'The prototype of [].keys() is %ArrayIteratorPrototype%'
+);