Spock - The next stage of Unit testing

Main thoughts
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Given-When-Then example
def "A basket with one product has equal weight" () {
given: "an empty basket and a TV"
Product tv = new Product(name:"bravia",price:1200,weight:18)
Basket basket = new Basket()
when: "user wants to buy the TV"
basket.addProduct(tv)
then: "basket weight is equal to the TV"
basket.currentWeight == tv.weight
}

Informative message example
import spock.lang.*
class MyFirstSpec extends
Specification {
def "let's try this!" () {
expect:
Math.max(1, 2) == 3
}
}

Interaction testing example
def "credit card connection is always closed down" () {
given: "a basket, a customer and a TV"
Product tv = new Product(name:"bravia",price:1200,weight:18)
BillableBasket basket = new BillableBasket ()
Customer customer = new Customer(...)
and: "a credit card service"
CreditCardProcessor creditCardSevice = Mock(CreditCardProcessor )
basket.setCreditCardProcessor(creditCardSevice)
when: "user checks out the tv"
basket.addProduct tv
basket.checkout(customer)
then: "connection is always closed at the end"
1 * creditCardSevice .shutdown()
}

Data Driven example
class HelloSpock extends spock.lang.Specification {
def "length of Spock's and his friends' names"() {
expect:
name.size() == length
where:
name | length
"Spock" | 5
"Kirk" | 4
"Scotty" | 6
}
}

Spock - The next stage of Unit testing

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