v8/test/mjsunit/accessors-on-global-object.js

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//
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// Test that installing a getter on the global object instead of a
// normal property works.

x = 0;

function getX() { return x; }

for (var i = 0; i < 10; i++) {
  assertEquals(i < 5 ? 0 : 42, getX());
  if (i == 4) this.__defineGetter__("x", function() { return 42; });
}


// Test that installing a setter on the global object instead of a
// normal property works.

y = 0;
var setter_y;

function setY(value) { y = value; }

for (var i = 0; i < 10; i++) {
  setY(i);
  assertEquals(i < 5 ? i : 2 * i, y);
  if (i == 4) {
    this.__defineSetter__("y", function(value) { setter_y = 2 * value; });
    this.__defineGetter__("y", function() { return setter_y; });
  }
}


// Test that replacing a getter with a normal property works as
// expected.

this.__defineGetter__("z", function() { return 42; });

function getZ() { return z; }

for (var i = 0; i < 10; i++) {
  assertEquals(i < 5 ? 42 : 0, getZ());
  if (i == 4) {
    delete z;
    z = 0;
  }
}