Makes sure prototype.constructor is writable

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS document.body.constructor is HTMLBodyElement.prototype.constructor
PASS document.body.__proto__.constructor is HTMLBodyElement.prototype.constructor
PASS document.body.__proto__.constructor = "testPrototype" did not throw exception.
PASS document.body.__proto__.constructor is "testPrototype"
PASS document.body.constructor is "testPrototype"
PASS document.body.constructor = "testInstance" did not throw exception.
PASS document.body.constructor is "testInstance"
PASS document.body.__proto__.constructor is "testPrototype"
PASS successfullyParsed is true

TEST COMPLETE