Problem with PHPUnit and Data Providers

Programmer Question

I have the following test case:

include_once('../Logger.php');

class LoggerTest extends PHPUnit_Framework_TestCase {

    static public function providerLogger() {
        return array(
           new Logger
        );
    }

    /**
     * @dataProvider providerLogger
     */
    public function testAddStream($logger) {
        $this->assertTrue(false);
    }

}

When I run it in PHPUnit, I get:

PHPUnit 3.4.14 by Sebastian Bergmann.

F

Time: 0 seconds, Memory: 5.75Mb

There was 1 failure:

1) Warning
The data provider specified for LoggerTest::testAddStream is invalid.
Data set #0 is invalid.


FAILURES!
Tests: 1, Assertions: 0, Failures: 1.

I remember having it working in a similar fashion before, but I could be wrong. What am I missing?

Thanks in advance for your help.

PHPUnit 3.4.14 (taken from PEAR) on PHP 5.3.3

Find the answer here