Can I use @depends to depend on a test using an @dataProvider?

I have a testclass in which one test runs multiple times via a @dataProvider and another test that @depends on the first method. However, when I called var_dump on what should be passed to the second test, it gives me a solid NULL, which I didn't expect.

In other words: what should this do:

<?php 
class DevicesTest extends PHPUnit_Framework_TestCase
{
    /**
     * @dataProvider registerDataProvider
     */
    public function testRegister($device, $supposedResult)
    {
        //do a bunch of tests
        return array($device, $supposedResult);
    }

    public function registerDataProvider()
    {
        return array(array("foo", "foo"));
    }

    /**
     * @depends testRegister
     */
    public function testSaveDevicePreferences($deviceArr)
    {
        $this->assertNotEmpty($deviceArr);
    }
}
?>