'If an ``X-If-Configuration-Matches`` header is sent with a matching
tag, the operation succeeds.'

def test_if_matches_success(self):

    expected_manifestation = _manifestation()
    current_primary_node = Node(uuid=self.NODE_A_UUID, applications={}, manifestations={expected_manifestation.dataset_id: expected_manifestation})
    deployment = Deployment(nodes=frozenset([current_primary_node]))
    return self._test_change_primary(expected_manifestation.dataset, deployment, self.NODE_A_UUID, self.NODE_B_UUID, if_matches=True)
