Spock is an open source testing framework for Java and Groovy applications that provides a business-readable specification language using Groovy. It allows developers to write tests in a more descriptive and expressive manner than JUnit with features like assertions, preconditions, and data-driven testing. The document outlines how to write Spock tests at different levels from unit to integration using its domain-specific language that leverages Groovy syntax.

1. Rob Fletcher git clone http://github.com/robfletcher/ggug-spock-examples

2. 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 "Everything is questioned, and only the essential is kept"

3. Classes extend spock.lang.Specification Feature methods: def "name in quotes"() separated into labelled blocks Lifecycle: setup cleanup setupSpec cleanupSpec

4. 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.

5. import spock.lang.* class TotalizerSpec extends Specification { def totalizer = new Totalizer() def "adding an item increments the total" () { when: "a product is added" totalizer.add( WIDGET ) then: "the total reflects the product's price" totalizer.total == WIDGET .price } }

6. assertEquals "Expo '86" , album.title assertFalse album.isCompilation() assertNotNull album.tracks.find { it == "Palm Road" } JUnit 3… assertThat album.title, equalTo( "Expo '86" ) assertThat album.isCompilation(), is(false) assertThat album.tracks, hasItem( "Palm Road" ) JUnit 4… then: album.title == "Expo '86" !album.isCompilation() album.tracks.find { it == "Palm Road" } Spock…

7. Condition not satisfied: starship.speed == old(starship.speed) + warpFactor | | | | | | | 8 | 5 7 2 | false [USS Enterprise NCC-1701] at StarshipSpec.starship accelerates predictably(StarshipSpec.groovy:44)

8. @Unroll( &quot;adding a #product increments the total&quot; ) def &quot;adding a product increments the total&quot; () { when: totalizer.add(product) then: totalizer.total == product.price where: product << [ WIDGET , GIZMO , THINGY ] }

9. def &quot;a user can be retrieved using their id&quot; () { when: def user = registry.findUser(id) then: user.name == name user.email == email where: id | name | email 1 | &quot;Rob Fletcher&quot; | &quot;rob@energizedwork.com&quot; 2 | &quot;Enoch Root&quot; | &quot;root@eruditorum.org&quot; 3 | &quot;Edward Teach&quot; | &quot;blackbeard@providence.bs&quot; }

10. def &quot;a message is sent when someone registers&quot; () { given: def registry = new Registry() def mailer = Mock(Mailer) registry.mailer = mailer when: registry.addPerson( &quot;Rob Fletcher&quot; , &quot;rob@ew.com&quot; ) then: 1 * mailer.send( &quot;rob@ew.com&quot; , &quot;Welcome Rob!&quot; ) }

11. import grails.plugin.spock.* class UserSpec extends UnitSpec { def &quot;users can be saved and retrieved&quot; () { setup: mockDomain(User) when: def user = new User(name: &quot;Rob&quot; ).save() then: !user.hasErrors() and: User.findByName( &quot;Rob&quot; ) } }

12. def &quot;Login fails if incorrect details submitted&quot; () { when: &quot;a user visits the login page&quot; def loginPage = LoginPage.open() and: &quot;enters their details incorrectly&quot; loginPage.loginWith( &quot;blackbeard&quot; , &quot;badpassword&quot; ) then: &quot;they should see an error message&quot; loginPage.loginError == LoginPage. LOGIN_FAILED_MSG and: &quot;they should not be logged in&quot; !HomePage.open().isLoggedIn() }

13. import geb.spock.* class GoogleSpockSpec extends GebSpec { def &quot;perform search&quot; () { when: to GoogleHomePage search.search( &quot;spock framework&quot; ) then: at GoogleResultsPage resultLink(0).text() == &quot;spock - Project Hosting on Google Code&quot; } }

14. spockframework.org blog.spockframework.org grails.org/plugin/spock Energized Work: energizedwork.com Blog: adhockery.blogspot.com Twitter: @rfletcherEW