private void assertNodeParentReservation(List<Node> nodes, Optional<TenantName> reservation, ProvisioningTester tester) {
        for (Node node : nodes)
            assertEquals(reservation, tester.nodeRepository().nodes().node(node.parentHostname().get()).get().reservedTo());
    }
Non-exclusive app first, then an exclusive: Should give the same result as above
node-repository/src/test/java/com/yahoo/vespa/hosted/provision/provisioning/VirtualNodeProvisioningTest.java