Bug 48770 was opened due to conflicting expectations about the behavior of:
call_user_func_array(array($this, 'parent::methodName'), array($arg1,$arg2))
The one reporting the 'bug' seemed to think that since the method name was prefixed with
`parent::`, it should call the method in the superclass of the *class where this code appears*.
However, `$this` might be an instance of a subclass. If so, then it is quite reasonable that
`call_user_func_array` will call the method as defined in the superclass of *the receiver*.
So the 'bug' is not really a bug. Therefore, there is no need for an XFAIL in the tests. They
should just pass.
Amend tests to reflect the actual expected behavior of `call_user_func_array`, not what the
person who reported bug 48770 thought it should be.
Closes GH-5386.