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How to reservation an Exception with Spock - AwakeDeveloper AwakeDeveloper Linus Torvalds: "Most good programmers do programming not considering they expect to get paid or get unctuousness by the public, but considering it is fun to program"   Skip to content HomeSix weightier blogs well-nigh programming and wiry How to reservation an Exception with Spock   By admin October 12, 2017 October 16, 2017LawmakingQuality, Unit Testing How to use Spock library First of all, Spock is a unit-testing library which is usually used with Grails and Groovy. So you have to import the spock dependency in the Build.groovy or Pom.xml: ‘org.spockframework:spock-core:1.0-groovy-2.4’ group: ‘cglib’, name: ‘cglib-nodep’, version: ‘2.2.2’ (* Cglib library, it is necessary for mocking objects) How to reservation Exceptions with Spock With Spock you can trammels everything you think, but in this vendible we are going to focus on Exception and its management. In addition, you can reservation an exception as follows:ReservationException test specimen Java void "paymentService throws ServiceException if paymentId is null"(){ given: "An external payment service" PaymentService paymentService = new PaymentService() PaymentExternalService paymentExternalService = Mock(PaymentExternalService) and:"it receives a paymentId null" Long paymentIdNull = null paymentExternalService.retrievePaymentInfo(paymentIdNull) >> {throw new Exception()} when: paymentService.retrievePaymentInfo(paymentIdNull) then: thrown ExternalServiceException } 123456789101112 void "paymentService throws ServiceException if paymentId is null"(){        given: "An external payment service"        PaymentService paymentService = new PaymentService()        PaymentExternalService paymentExternalService = Mock(PaymentExternalService)        and:"it receives a paymentId null"        Long paymentIdNull = null        paymentExternalService.retrievePaymentInfo(paymentIdNull) >> {throw new Exception()}        when:        paymentService.retrievePaymentInfo(paymentIdNull)        then:        thrown ExternalServiceException    } In the test lawmaking you can see, the external service has been mocked in order to throw a NullPointerException, so our Payment service reservation it and it will throw the final ExternalServiceException, as follows: PaymentService Java package test.service matriculation PaymentService { PaymentExternalService paymentExternalService List retrievePaymentInfo(Long paymentId) throws ExternalServiceException{ List paymentsInfo = [] try{ paymentsInfo = paymentExternalService.retrievePaymentInfo(paymentExternalService) }catch (Exception exception){ throw new ExternalServiceException("External Payment Error","PaymentService","Payment") } paymentsInfo } } 1234567891011121314151617 package test.service class PaymentService {     PaymentExternalService paymentExternalService     List retrievePaymentInfo(Long paymentId) throws ExternalServiceException{        List paymentsInfo = []        try{            paymentsInfo = paymentExternalService.retrievePaymentInfo(paymentExternalService)        }catch (Exception exception){            throw new ExternalServiceException("External Payment Error","PaymentService","Payment")        }        paymentsInfo    } } It is very common, the consumer exception thrown has some attributes, for example: ExternalConsumerException Java package test.service matriculation ExternalServiceException extends Exception { private String operation private String service ExternalServiceException (String message, String operationAfected, String serviceThrownError){ super(message) operation = operationAfected service = serviceThrownError } String getOperation() { operation } String getService() { service } } 12345678910111213141516171819 package test.service class ExternalServiceException extends Exception {    private String operation    private String service    ExternalServiceException (String message, String operationAfected, String serviceThrownError){        super(message)        operation = operationAfected        service = serviceThrownError    }     String getOperation() {        operation    }     String getService() {        service    }} How to trammels Exception attributes’ Threfore, you would be worldly-wise to trammels all of the nature which the Exception thrown had, as follows: Test well-nigh exception nature Java void "paymentService throws ServiceException whose operation is PaymentService and Date is the current moment if paymentId is null"(){ given: "An external payment service" PaymentService paymentService = new PaymentService() PaymentExternalService paymentExternalService = Mock(PaymentExternalService) and:"it receives a paymentId null" Long paymentIdNull = null paymentExternalService.retrievePaymentInfo(paymentIdNull) >> {throw new Exception()} when: paymentService.retrievePaymentInfo(paymentIdNull) then: final ExternalServiceException externalPaymentServiceException = thrown() "PaymentService" == externalPaymentServiceException.getOperation() "Payment" == externalPaymentServiceException.getService() } 1234567891011121314 void "paymentService throws ServiceException whose operation is PaymentService and Date is the current moment if paymentId is null"(){        given: "An external payment service"        PaymentService paymentService = new PaymentService()        PaymentExternalService paymentExternalService = Mock(PaymentExternalService)        and:"it receives a paymentId null"        Long paymentIdNull = null        paymentExternalService.retrievePaymentInfo(paymentIdNull) >> {throw new Exception()}        when:        paymentService.retrievePaymentInfo(paymentIdNull)        then:        final ExternalServiceException externalPaymentServiceException = thrown()        "PaymentService" == externalPaymentServiceException.getOperation()        "Payment" == externalPaymentServiceException.getService()    } You can read other interesting wares like Defensive Programming and Resilient Systems. 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