Test that Typed Array internal slots are not inherited by TypedArray.prototype.buffer

test/built-ins/TypedArray/prototype/buffer/this-inherits-typedarray.js

@@ -0,0 +1,33 @@
+// Copyright (C) 2020 Google. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-get-%typedarray%.prototype.buffer
+description: >
+  Throws a TypeError exception when `this` does not have a [[TypedArrayName]]
+  internal slot, even if its prototype does
+info: |
+  22.2.3.1 get %TypedArray%.prototype.buffer
+
+  1. Let O be the this value.
+  2. If Type(O) is not Object, throw a TypeError exception.
+  3. If O does not have a [[TypedArrayName]] internal slot, throw a TypeError
+  exception.
+  ...
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+var TypedArrayPrototype = TypedArray.prototype;
+var getter = Object.getOwnPropertyDescriptor(
+  TypedArrayPrototype, "buffer"
+).get;
+
+testWithTypedArrayConstructors(TA => {
+  var typedArray = new TA(5);
+  var o = {};
+  Object.setPrototypeOf(o, typedArray);
+  assert.throws(TypeError, function() {
+    getter.call(o);
+  },
+  "Internal slot should not be inherited");
+});