'Error on manage with bad reference.
This test case attempts to manage an existing volume but passes in
a bad reference that the Storwize driver doesn\'t understand.  We
expect an exception to be raised.'

def test_manage_existing_get_size_bad_ref(self):

    volume = self._generate_vol_info()
    ref = {}
    self.assertRaises(exception.ManageExistingInvalidReference, self.driver.manage_existing_get_size, volume, ref)
