### Question:
FaasIidFactory { public static InstanceIdentifier<MappedSubnet> mappedSubnetIid(TenantId gbpTenantId, SubnetId subnetId) { return InstanceIdentifier.builder(MappedTenantsEntities.class) .child(MappedEntity.class, new MappedEntityKey(gbpTenantId)) .child(MappedSubnet.class, new MappedSubnetKey(subnetId)) .build(); }  static InstanceIdentifier<LogicalNetworks> logicalNetworksIid(); static InstanceIdentifier<LogicalNetwork> logicalNetworkIid(EndpointGroupId consumerEpgId,
            TenantId consumerTenantId, ContractId contractId, EndpointGroupId providerEpgId, TenantId providerTenantId); static InstanceIdentifier<MappedTenantsEntities> mappedTenantsEntitiesIid(); static InstanceIdentifier<MappedSubnet> mappedSubnetIid(TenantId gbpTenantId, SubnetId subnetId); static InstanceIdentifier<MappedTenant> mappedTenantIid(TenantId gbpTenantId); static InstanceIdentifier<MappedEntity> mappedEntityIid(TenantId gbpTenantId); static InstanceIdentifier<MappedContract> mappedContractIid(TenantId gbpTenantId, ContractId contractId); static InstanceIdentifier<MappedEndpoint> mappedEndpointIid(TenantId gbpTenantId,
            MappedEndpointKey mappedEndpointKey);  }### Answer:
@Test public void testMappedSubnetIid() { TenantId gbpTenantId = new TenantId("gbpTenantId"); SubnetId subnetId = new SubnetId("subnetId"); assertNotNull(FaasIidFactory.mappedSubnetIid(gbpTenantId, subnetId)); }