1 files changed, 32 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/class/subclass/builtins.js b/js/src/tests/test262/language/statements/class/subclass/builtins.js
new file mode 100644
index 0000000000..dc95f7827a
--- /dev/null
+++ b/js/src/tests/test262/language/statements/class/subclass/builtins.js
@@ -0,0 +1,32 @@
+// Copyright (C) 2014 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+es6id: 14.5
+description: >
+    class sublclassing builtins
+---*/
+class ExtendedUint8Array extends Uint8Array {
+  constructor() {
+    super(10);
+    this[0] = 255;
+    this[1] = 0xFFA;
+  }
+}
+
+var eua = new ExtendedUint8Array();
+assert.sameValue(eua.length, 10, "The value of `eua.length` is `10`");
+assert.sameValue(eua.byteLength, 10, "The value of `eua.byteLength` is `10`");
+assert.sameValue(eua[0], 0xFF, "The value of `eua[0]` is `0xFF`");
+assert.sameValue(eua[1], 0xFA, "The value of `eua[1]` is `0xFA`");
+assert.sameValue(
+  Object.getPrototypeOf(eua),
+  ExtendedUint8Array.prototype,
+  "`Object.getPrototypeOf(eua)` returns `ExtendedUint8Array.prototype`"
+);
+assert.sameValue(
+  Object.prototype.toString.call(eua),
+  "[object Uint8Array]",
+  "`Object.prototype.toString.call(eua)` returns `\"[object Uint8Array]\"`"
+);
+
+reportCompare(0, 0);