test/mjsunit/regress/regress-1240.js

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// This regression tests that we are not allowed to overwrite an existing
// non-configurable getter with a new getter. In addition, we should not
// be able to change the configurable flag from false to true.

var a = {};
Object.defineProperty(a, 'b',
                      { get: function () { return 42; }, configurable: false });
// Do not allow us to redefine b on a.
a.__defineGetter__('b', function _b(){ return 'foo'; });
assertEquals(42, a.b);
var desc = Object.getOwnPropertyDescriptor(a, 'b');
assertFalse(desc.configurable);