### Question:
AAIVpnBindingResources { public Optional<org.onap.aai.domain.yang.VpnBinding> getVpnBinding(String vpnId) { return injectionHelper.getAaiClient().get(org.onap.aai.domain.yang.VpnBinding.class, AAIUriFactory.createResourceUri(AAIFluentTypeBuilder.network().vpnBinding(vpnId))); }  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 getVpnBindingTest() { org.onap.aai.domain.yang.VpnBinding vpnBinding = new org.onap.aai.domain.yang.VpnBinding(); vpnBinding.setVpnId("vnfId"); when(MOCK_aaiResourcesClient.get(eq(org.onap.aai.domain.yang.VpnBinding.class), isA(AAIResourceUri.class))) .thenReturn(Optional.of(vpnBinding)); aaiVpnBindingResources.getVpnBinding("vpnId"); verify(MOCK_aaiResourcesClient, times(1)).get(eq(org.onap.aai.domain.yang.VpnBinding.class), isA(AAIResourceUri.class)); }