[B]ehavior [D]riven [D]evelopment

AGENDA

Who is this new Indian guy?
BDD

Why? What? How?

Spock Framework

Why? What? How?

Demos
No Questions Please..

Who Am I?

Dhiraj Mahapatro

Grails Developer @ NetJets

twitter # @dhirajmahapatro

GitHub # http://bit.ly/1b07DuM

Stackoverflow# dmahapatro

BDD facilitates writing correct code

Why BDD when we follow TDD?

TDD facilitates writing code correct

TDD Approach

@TestFor(SampleController)@Mock(Sample)
class SampleControllerTests {
    void testControllerActionShowReturnsString() {       //Create mocked object instance
       new Sample(name: 'Sample')

       //Call controller action       controller.show()

       //Assert response
       assert controller.response.contentAsString == 'Hello World'
    }
}

Test makes sure the controller action is called and response is got back appropriately.

We tested:

Code works correctly!!! [Peace]

Unit test passes!!!

Who cares about business acceptance criteria?

But we never tested:

Do we really want "Hello World" back from action?

Did we actually meet the acceptance criteria?

The behavior of the application?

RESULT >>

Unhappy BA

Solution

Be Cognizant of the behavior [3 Amigos]

Development based on Behavior

Behavior Based Test Case

@TestFor(SampleController)@Mock(Sample)
class SampleControllerTests extends ControllerSpec{
    void "test controller should return Grails and Ale"() {       given: "A sample object with name Sample"          new Sample(name: 'Sample')
              when: "Controller show action is called"          controller.show()

       then: "The response should be Grails and Ale"
          controller.response.contentAsString == 'Grails and Ale'
    }
}