private void assertHostSpecParentReservation(List<HostSpec> hostSpecs, Optional<TenantName> reservation, ProvisioningTester tester) {
        for (HostSpec hostSpec : hostSpecs) {
            Node node = tester.nodeRepository().nodes().node(hostSpec.hostname()).get();
            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