'``/VolumeDriver.Get`` returns the mount path of the given volume if
it is currently known, including for a dataset that was created
not by the plugin.'

def test_get_existing(self):

    name = u'myvol'
    d = self.flocker_client.create_dataset(self.NODE_A, int(DEFAULT_SIZE.to_Byte()), metadata={NAME_FIELD: name})
    def created(dataset):
        self.flocker_client.synchronize_state()
        return self.assertResult('POST', '/VolumeDriver.Get', {u'Name': name}, OK, {u'Err': u'', u'Volume': {u'Name': name, u'Mountpoint': u'/flocker/{}'.format(dataset.dataset_id)}})
    d.addCallback(created)
    return d
