'An attempt to attach an already attached ``BlockDeviceVolume`` raises
``AlreadyAttachedVolume``.'

def test_attach_attached_volume(self):

    dataset_id = uuid4()
    new_volume = self.api.create_volume(dataset_id=dataset_id, size=self.minimum_allocatable_size)
    attached_volume = self.api.attach_volume(new_volume.blockdevice_id, attach_to=self.this_node)
    self.assertRaises(AlreadyAttachedVolume, self.api.attach_volume, blockdevice_id=attached_volume.blockdevice_id, attach_to=self.this_node)
