### Question:
AAIVnfResources { public boolean checkInMaintFlag(String vnfId) { org.onap.aai.domain.yang.GenericVnf vnf = injectionHelper.getAaiClient() .get(org.onap.aai.domain.yang.GenericVnf.class, AAIUriFactory.createResourceUri(AAIFluentTypeBuilder.network().genericVnf(vnfId))) .orElse(new org.onap.aai.domain.yang.GenericVnf()); return vnf.isInMaint(); }  void createVnfandConnectServiceInstance(GenericVnf vnf, ServiceInstance serviceInstance); void createPlatformandConnectVnf(Platform platform, GenericVnf vnf); void createLineOfBusinessandConnectVnf(LineOfBusiness lineOfBusiness, GenericVnf vnf); void deleteVnf(GenericVnf vnf); void updateOrchestrationStatusVnf(GenericVnf vnf, OrchestrationStatus orchestrationStatus); void updateObjectVnf(GenericVnf vnf); Optional<org.onap.aai.domain.yang.GenericVnf> getGenericVnf(String vnfId); boolean checkInMaintFlag(String vnfId); void connectVnfToCloudRegion(GenericVnf vnf, CloudRegion cloudRegion); void connectVnfToTenant(GenericVnf vnf, CloudRegion cloudRegion); boolean checkVnfClosedLoopDisabledFlag(String vnfId); boolean checkVnfPserversLockedFlag(String vnfId); boolean checkNameInUse(String vnfName); AAIResultWrapper queryVnfWrapperById(GenericVnf vnf); Optional<Vserver> getVserver(AAIResourceUri uri);  }### Answer:
@Test public void checkInMaintFlagTest() { Optional<org.onap.aai.domain.yang.GenericVnf> vnf = Optional.of(new org.onap.aai.domain.yang.GenericVnf()); vnf.get().setVnfId("vnfId"); vnf.get().setInMaint(true); doReturn(vnf).when(MOCK_aaiResourcesClient).get(eq(org.onap.aai.domain.yang.GenericVnf.class), isA(AAIResourceUri.class)); boolean inMaintFlag = aaiVnfResources.checkInMaintFlag("vnfId"); verify(MOCK_aaiResourcesClient, times(1)).get(eq(org.onap.aai.domain.yang.GenericVnf.class), isA(AAIResourceUri.class)); assertEquals(inMaintFlag, true); }