@Test
@SuppressWarnings("all")
public void mutateBillingSetupTest() {

  MutateBillingSetupResponse expectedResponse = MutateBillingSetupResponse.newBuilder().build();
  mockBillingSetupService.addResponse(expectedResponse);
  String customerId = "customerId-1772061412";
  BillingSetupOperation operation = BillingSetupOperation.newBuilder().build();
  MutateBillingSetupResponse actualResponse = client.mutateBillingSetup(customerId, operation);
  Assert.assertEquals(expectedResponse, actualResponse);
  List<AbstractMessage> actualRequests = mockBillingSetupService.getRequests();
  Assert.assertEquals(1, actualRequests.size());
  MutateBillingSetupRequest actualRequest = (MutateBillingSetupRequest) actualRequests.get(0);
  Assert.assertEquals(customerId, actualRequest.getCustomerId());
  Assert.assertEquals(operation, actualRequest.getOperation());
  Assert.assertTrue(
      channelProvider.isHeaderSent(
          ApiClientHeaderProvider.getDefaultApiClientHeaderKey(),
          GaxGrpcProperties.getDefaultApiClientHeaderPattern()));
}