### Question:
AAIVpnBindingResources { public void connectCustomerToVpnBinding(String globalSubscriberId, String vpnId) { AAIResourceUri customerURI = AAIUriFactory.createResourceUri(AAIFluentTypeBuilder.business().customer(globalSubscriberId)); AAIResourceUri vpnBindingURI = AAIUriFactory.createResourceUri(AAIFluentTypeBuilder.network().vpnBinding(vpnId)); injectionHelper.getAaiClient().connect(customerURI, vpnBindingURI); }  boolean existsCustomer(Customer customer); Optional<VpnBindings> getVpnBindingByCustomerVpnId(String customerVpnId); void createVpnBinding(VpnBinding vpnBinding); void createCustomer(Customer customer); Optional<org.onap.aai.domain.yang.VpnBinding> getVpnBinding(String vpnId); void connectCustomerToVpnBinding(String globalSubscriberId, String vpnId);  }### Answer:
@Test public void connectCustomerToVpnBinding() { doNothing().when(MOCK_aaiResourcesClient).connect(isA(AAIResourceUri.class), isA(AAIResourceUri.class)); aaiVpnBindingResources.connectCustomerToVpnBinding("testCustId", "testVpnId"); verify(MOCK_aaiResourcesClient, times(1)).connect(isA(AAIResourceUri.class), isA(AAIResourceUri.class)); }