Spock:���Boldly go where no test has

gone before

Andres Almiray Canoo Fellow

Canoo Engineering AG

@aalmiray

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Andres Almiray

Speaker Bio

■  Java developer since the beginning

■  True believer in open source

■  Groovy committer since 2007

■  Project lead of the Griffon framework

■  Currently working for

What is Spock?

Where, Who, How?

■ http://spockframework.org

■ Peter Niederwiser @pniederw

■ Groovy based Testing Language

■ Byte code manipulation at compile time

■  Inspired by JUnit, Rspec, jMock, Mockito, Groovy, Scala and Vulcans

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Why?

■  Expressive testing language

■  Easy to learn

■  Usable from unit to end-to-end level

■  Leverages Groovy language features

■  Runs with JUnit: compatible with IDEs, build tools & CI

■  Extensible for specialized testing scenarios

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First Cut 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 } }

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Introducing a bug 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" | 7 } }

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A wild error appears! Condition not satisfied:

name.size() == length

| | | |

| 6 | 7

Scotty false

at com.acme.HelloSpock.length of Spock's and his friends' names(HelloSpock.groovy:6)

Feature List (1)

Blocks

■ given: preconditions, data fixtures, etc.

■ when: actions that trigger some outcome

■ then: makes assertions about outcome

■ expect: short alternative to when & then

■ where: applies varied inputs

■ and: sub-divides other blocks

■ setup: alias for given

■ cleanup: post-conditions, housekeeping, etc.

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Feature List (2)

Lifecycle

■ setup

■ cleanup

■ setupSpec

■ cleanupSpec

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Data Driven

■  List based variables

■  Table based variables

■  @Unroll

■  @Shared

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Unrolling class HelloSpock extends spock.lang.Specification {

@Unroll

def "Length of #name should be #name.size(), actual value is #length"() { expect: name.size() == length where: name | length "Spock" | 5 "Kirk" | 4 "Scotty" | 6 } }

Unrolling as seen by an IDE

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Interactions (Mocks) class BindableSpec extends Specification {

def "Model properties are observable"() {

given:

def model = new Model()

def listener = Mock(PropertyChangeListener)

when:

model.addPropertyChangeListener(listener)

model.name = 'Groovy'

model.name = 'Java'

then:

1 * listener.propertyChange({it.newValue == 'Groovy'})

1 * listener.propertyChange({it.newValue == 'Java'})

}

}

But wait, there’s more!

■ http://docs.spockframework.org/en/latest/

■ Spock is extensible via plugins

■ Functional web testing with GEB

■ Plugins exist for Grails and Griffon

■ Next release will be 1.0

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Q&A Andres Almiray

@aalmiray