HTTP headers options for unit tests?

I have a common controller where I like to keep logic and render it in
different ways depending on how its called.
For instance assume you have a controller called Foo with an action
called bar that returns true in JSON or XML or renders a view
depending on how it was requested.

class FooController extends AppController {

function bar() {
$this->data = true;
if ( $this->isAPICall() ) {
$this->renderAPI();
} else {
$this->render();
}
}

class AppController extends Controller {

public function isAPICall() {
if ( $this->RequestHandler->accepts('html') ) {
return false;
}
if ( $this->RequestHandler->accepts('xml') || $this->RequestHandler-
>accepts('json') ) {
return true;
}
return false;
}

public function renderAPI() {
// Turn off debugging so the render time does not get included in
the output
Configure::write('debug', 0);
if ( $this->RequestHandler->accepts('xml') ) {
$this->renderXML();
}
elseif ( $this->RequestHandler->accepts('json') ) {
$this->renderJSON();
}
}
}

This works great and allows me to re-use tons of logic. The problem is
how to test it using the Cake 1.3 test cases. If there where some way
to modify request headers before the action is called it would be a
easy as cake :)

Anybody think this is possible if CakeTestCase was modified?

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