php - Stub for formal parameter passed by reference in PHPSpec/Prophecy -

i have method in php looks this:

<?php class someclass {     public function isentitledtodiscount(guestmodel $who, $onwhat, &$discountamount = null)     {         $discountamount = 10;         return true;     } } 

is there way stub $discountamount in phpspec? let's have class i'm testing, , i've injected $someservice via constructor. in spec use:

<?php $someservice->isentitledtodiscount($guest, $ticket, $discountamount)->willreturn(true); 

which creates stub method return value. how can $discountamount formal parameter?

a method shouldn't modify arguments (shouldn't have side effects). getter-type method. you should rethink design.

your problem related prohpecy, might want read docs: https://github.com/phpspec/prophecy

prophecy (and phpspac) make things hard. in cases means you're trying take wrong turn design.

you try following, don't think you'll reference variable:

$someservice->isentitledtodiscount($guest, $ticket, $discountamount)     ->will(function ($arguments) {         // evil     }); 

recommended read: command query separation.