code: private CreateInternetGatewayResponseType createInternetGateway() {
          CreateInternetGatewayResponseType ret = new CreateInternetGatewayResponseType();
          ret.setRequestId(UUID.randomUUID().toString());
          MockInternetGateway mockInternetGateway = mockInternetGatewayController
                  .createInternetGateway();
          InternetGatewayType internetGateway = new InternetGatewayType();
          internetGateway.setInternetGatewayId(mockInternetGateway.getInternetGatewayId());
          ret.setInternetGateway(internetGateway);
          return ret;
      }
docs: Handles "createInternetGateway" request to create InternetGateway and returns response with a InternetGateway.
  @return a CreateInternetGatewayResponseType with our new InternetGateway