test(function () {
var webpage = require('webpage');
var page = webpage.create();
// Hijack JSON.parse to something completely useless.
page.content = '<html><script>JSON.parse = function() {}</script></html>';
var result = page.evaluate(function(obj) {
return obj.value * obj.value;
}, { value: 4 });
assert_equals(result, 16);
}, "page script should not interfere with page.evaluate");