public function testGetProfile()
{
    $g = $this->_getMockedGravatar('{"test":"example"}');
    $this->assertEquals(
        array('test' => 'example'),
        $g->getProfile('test@example.org')
    );
}

private function _getMockedGravatar($response_string)
{
    $response = $this->getMock('Horde_Http_Response', array('getBody'));
    $response->expects($this->once())
        ->method('getBody')
        ->will($this->returnValue($response_string));

    $mock = $this->getMock('Horde_Http_Client', array('get'));
    $mock->expects($this->once())
        ->method('get')
        ->will($this->returnValue($response));

    return new Horde_Service_Gravatar(
        Horde_Service_Gravatar::STANDARD,
        $mock
    );
}