JSTests/test262/test/language/expressions/super/prop-expr-obj-val.js

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-super-keyword
es6id: 12.3.5
description: Value of reference returned by SuperProperty
info: |
  [...]
  4. If the code matched by the syntactic production that is being evaluated is
     strict mode code, let strict be true, else let strict be false.
  5. Return ? MakeSuperPropertyReference(propertyKey, strict).

  12.3.5.3 Runtime Semantics: MakeSuperPropertyReference

  1. Let env be GetThisEnvironment( ).
  2. If env.HasSuperBinding() is false, throw a ReferenceError exception.
  3. Let actualThis be ? env.GetThisBinding().
  4. Let baseValue be ? env.GetSuperBase().
  5. Let bv be ? RequireObjectCoercible(baseValue).
  6. Return a value of type Reference that is a Super Reference whose base
     value component is bv, whose referenced name component is propertyKey,
     whose thisValue component is actualThis, and whose strict reference flag
     is strict.
---*/

var fromA, fromB;
var A = { fromA: 'a', fromB: 'a' };
var B = { fromB: 'b' };
Object.setPrototypeOf(B, A);

var obj = {
  fromA: 'c',
  fromB: 'c',
  method() {
    fromA = super['fromA'];
    fromB = super['fromB'];
  }
};

Object.setPrototypeOf(obj, B);

obj.method();

assert.sameValue(fromA, 'a');
assert.sameValue(fromB, 'b');