CODEWITHSUNDEEP
unit-testinggrailsjunit
B K
B K

Reputation: 743

how to mock a service method inside a controller for unit testing in grails using JUnit and when to use mockController

Help me understand how to mock a service method inside a controller for unit testing in grails using JUnit

I was trying to write a unit test case for my controller "add". 

void testAdd_UT_03(){

......declaring and assigning prerequisites

   controller.add() // This is the controller i want to unit test

.... asserting 

  }

//Controller def add{

  def a =someService.method()

  }

Inside controller, some service methods are getting called which in turn is using HQL statements. Since i could not find a way to deal with HQL statements in unit testing, i want to mock the service method itself. ( i want the service method to return the predefined output). Could someone please explain how to achieve this?

Could you also explain when to use mockController? what we really achieve by mocking something? ( i dint get the real picture as i am entirely new to this)

Thanks in advance, BK

Upvotes: 1

Views: 1653

Answers (1)

dynamo
dynamo

Reputation: 1153

you can add the following code in the setUp method of your test to mock the service method and when you call the method "add" method on your controller it will call the mocked service method.

def predifinedOutput
void setUp(){
    def mockControl = mockFor(YourService)
      //params are the parameters passed to the service method
      mockControl.demand.yourServiceMethod(0..10) { params-> 
      predifnedOutput = "predifinedOutput"          
      return "predefined output"
    }


    controller.yourService = mockControl.createMock()
}

Upvotes: 2

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