public function testPrefixed()
 {
     $container = $this->getContainerMock();
     $dataObject = $this->getDataObjectMock('prefix/filename.ext');
     $dataObject->shouldReceive('getContent')->andReturn('file contents');
     $container->shouldReceive('getObject')->andReturn($dataObject);
     $adapter = new Rackspace($container, 'prefix');
     $this->assertInternalType('array', $adapter->read('filename.ext'));
 }