TypedArray and ArrayBuffer support for @@species

test/mjsunit/es6/legacy-subclassing.js

Index: test/mjsunit/es6/legacy-subclassing.js
diff --git a/test/mjsunit/es6/legacy-subclassing.js b/test/mjsunit/es6/legacy-subclassing.js
new file mode 100644
index 0000000000000000000000000000000000000000..73b684f99461237f55446e4340a61063effd6b71
--- /dev/null
+++ b/test/mjsunit/es6/legacy-subclassing.js
@@ -0,0 +1,35 @@
+// Copyright 2015 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --noharmony-species
+
+// Before Symbol.species was added, ArrayBuffer subclasses constructed
+// ArrayBuffers, and Array subclasses constructed Arrays, but TypedArray and
+// Promise subclasses constructed an instance of the subclass.
+
+'use strict';
+
+assertEquals(undefined, Symbol.species);
+
+class MyArray extends Array { }
+let myArray = new MyArray();
+assertEquals(MyArray, myArray.constructor);
+assertEquals(Array, myArray.map(x => x + 1).constructor);
+assertEquals(Array, myArray.concat().constructor);
+
+class MyUint8Array extends Uint8Array { }
+Object.defineProperty(MyUint8Array.prototype, "BYTES_PER_ELEMENT", {value: 1});
+let myTypedArray = new MyUint8Array(3);
+assertEquals(MyUint8Array, myTypedArray.constructor);
+assertEquals(MyUint8Array, myTypedArray.map(x => x + 1).constructor);
+
+class MyArrayBuffer extends ArrayBuffer { }
+let myBuffer = new MyArrayBuffer(0);
+assertEquals(MyArrayBuffer, myBuffer.constructor);
+assertEquals(ArrayBuffer, myBuffer.slice().constructor);
+
+class MyPromise extends Promise { }
+let myPromise = new MyPromise(() => {});
+assertEquals(MyPromise, myPromise.constructor);
+assertEquals(MyPromise, myPromise.then().constructor);