src/v8/test/mjsunit/regress/regress-2606.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// Check baseline for __proto__.
var desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertFalse(desc.enumerable);
assertTrue(desc.configurable);
assertEquals("function", typeof desc.get);
assertEquals("function", typeof desc.set);

// Check redefining getter for __proto__.
function replaced_get() {};
Object.defineProperty(Object.prototype, "__proto__", { get:replaced_get });
desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertFalse(desc.enumerable);
assertTrue(desc.configurable);
assertSame(replaced_get, desc.get);

// Check redefining setter for __proto__.
function replaced_set(x) {};
Object.defineProperty(Object.prototype, "__proto__", { set:replaced_set });
desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertFalse(desc.enumerable);
assertTrue(desc.configurable);
assertSame(replaced_set, desc.set);

// Check changing configurability of __proto__.
Object.defineProperty(Object.prototype, "__proto__", { configurable:false });
desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
assertFalse(desc.enumerable);
assertFalse(desc.configurable);
assertSame(replaced_get, desc.get);
assertSame(replaced_set, desc.set);

// Check freezing Object.prototype completely.
Object.freeze(Object.prototype);
assertTrue(Object.isFrozen(Object.prototype));