I need to be able to set a `$_SERVER[]` variable in my unit test to several different values. I have seen [this answer](https://stackoverflow.com/q/6934951/1743903), but that only allows me to have 1 value, and I need to test multiple values.

I get the sense from the CakePHP documentation that it has something to do with `$this->configRequest()`, but that's just a hunch at this point.