Groovy BDD

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# Groovy BDD
## Smidig 2011

.footnote[Ole Christian Langfjæran Bekk Consulting]

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# Behaviour
# Driven
# Development

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# Given
# When
# Then

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# Java

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# Cucumber

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# JBehave

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# Cucumber

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For eksempel

Feature: Division
	
	In order to avoid silly mistakes
	Cashiers must be able to calculate a fraction

Scenario: Regular numbers
	
		I have entered 3 into the calculator
		I press divide
		I have entered 2 into the calculator

1.5 on screen

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![Cucumber](images/cucumber.jpg)

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# Groovy

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## Factories, factories, factories
	.java
	class ObjectFactory {       
	   	static Ninja ninja(Map params = [:]){
	       	return new Ninja([name:"Splinter", weapon:"Katana"]+params)
	   	}
	...
	Ninja n = ninja(name:"Shredder");

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## @Delegate
	.java
	class MyeBruktKode{
		String someNumber() {
			return "42"
		}
	}

class MinService{
		@Delegate MyeBruktKode mye = new MyeBruktKode()
		
		String whatsTheMeaningOfLife() {
			return someNumber()
		}
	}

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![GroovyBDDFlow](images/groovybddflow.jpg)

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## Given, When, Then
	.java
	class AbstractGroovyFeature {
	    @Autowired protected GodAndOdinStep Given = new GodAndOdinStep();
	    @Autowired protected GodAndOdinStep When = Given;
	    @Autowired protected GodAndOdinStep Then = Given;
	    @Autowired protected GodAndOdinStep And = Given;
	
		@Autowired protected RemoveEntity remove
	}

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## Many small steps
	.java
	@Component
	class GodAndOdinStep {
	    @Delegate 
	    DateCalculatorSteps dateCalculatorSteps = new DateCalculatorSteps();
	    @Autowired @Delegate 
	    NinjaStep ninjaStep
	    @Autowired @Delegate 
	    NinjaHouseStep ninjaHouseStep
	}

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## The Step
	.java
	class DateCalculatorSteps {
	    DateCalculator calculator;
	    String result

void today_is(String date){
	        calculator = new DateCalculator(Date.parse("yyyy-MM-dd", date))
	    }

void I_ask_if_the_date_is_in_the_past_for(String date){
	        result = calculator.isDateInThePast(Date.parse("yyyy-MM-dd", date))
	    }

void the_result_from_the_datecalculator_should_be(String answer){
	        assertThat(result, equalTo(answer))
	    }
	}

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## The DateCalculator Feature
	.java
	class DateCalculatorFeature extends AbstractGroovyFeature{
	    @Test
	    void determine_past_date(){
	        Given.today_is "2011-11-04"
	        When.I_ask_if_the_date_is_in_the_past_for "2011-1-1"
	        Then.the_result_from_the_datecalculator_should_be "yes"
	    }
	}

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# Spring
# Hibernate

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## RunWith Spring like the wind
	.java
	@RunWith(SpringJUnit4ClassRunner.class)
	@ContextConfiguration(locations=["classpath:applicationContext-groovy-bdd.xml"])
	class AbstractSpringGroovyFeature extends AbstractGroovyFeature {
	}

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## Groovy NinjaFeatures sprinkled with Spring
	.java
	class NinjaFeatures extends AbstractSpringGroovyFeature{

@Test
	    void should_be_able_to_kill_a_ninja(){
	        Given.ninja_exists([name:"Shredder"])
	        When.the_ninja_gets_killed_by SHURIKIEN
	        Then.the_ninja_should_be_dead "Shredder"
	    }
	
		@After
		void clean_up_repo() {
			remove.allEntities();
		}

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## Spring up for NinjaStep
	.java
	@Component
	class NinjaStep {
	    @Autowired GetEntity get
	    @Autowired PersistEntity persist
	    private Ninja _ninja

@Transactional
	    void ninja_exists(Object theNinja = null) {
	        _ninja = theNinja == null ? ninja() : new Ninja(theNinja)
	        persist.entity(_ninja);
	    }

@Transactional
	    void the_ninja_gets_killed_by(Weapon weapon) {
	        get.ninja(_ninja.name).killBy(weapon);
	    }

@Transactional
	    void the_ninja_should_be_dead(String nameOfNinja) {
	        assertThat(get.ninja(nameOfNinja).isDead(), equalTo(true));
	    }
	}

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## Real life crisis
	.java
	@Test
    void skal_hente_en_ledig_boligperiode_naar_det_finnes_boliger() {
        Gitt.Gitt_at_vi_har_en_fresh_database();
        Og.at_utleieenheten_eksisterer([enhetId: "BJE", active: true, names: [no: "Bjerke", en: "Bjerke"]]);
        Og.at_boligtypen_med_kode_og_navn_eksisterer("HM", "HM", "BJE");
        Og.at_utleieobjekt_med_id_og_status_eksisterer("BJErkis007", "BJE", "HM", klarmeldt());
        Naar.jeg_henter_boligperioder_tildelinger_med_filtrering_paa([tildelingsdato: JUN_1])
        Saa.skal_jeg_faa_en_liste_med_ledige_boligperioder_som_har_lengde(1)
        Og.forste_ledige_boligperiode_ha_antall_ledige(1)
    }

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# ?
## [bit.ly/GroovyBDD](http://bit.ly/GroovyBDD)
.footnote[Laget med [github.com/gnab/remark](http://github.com/gnab/remark)]

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# Cucumber JVM

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## JUnit
	.java
	@RunWith(Cucumber.class)
	@Feature(value = "date_calculator.feature")
	public class date_calculator_Test {
	}

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![JUnit Cucumber](images/junit_cucumber.png)