Testing legacy apps with Spock

MarcinGryszko
@mgryszko
TestinglegacyappswithSpock

Mymotivation
Retrofit a legacyapp (Java + Hibernate+ Spring) with automated tests
WhynotwithGroovy?
Butwhattool?

Theansweris...
Spock!

WhyGroovy and Spockfor a Java developer?
Groovy
powerfulsyntax
codeless and do more
Spock
BDDstyletesting
describe featuresthroughexecutablespecifications
documentation and examples of legacycode
Integrateswith Spring & DbUnit
RunswithJUnit 4 => Maven, CI

Extendspock.lang.Specification
classBankDaoSpecextendsSpecification
Define a feature (test) method
def “finds a bank by id"() {
// blocks for 4 test phases
setup:
when:
then:
}
HOW DO I TEST?

Featuremethod blocks
4 test phases in blocks
Setup => setup: / given:/ where:
Execute => when: / expect:
Verify => then: / expect:
Teardown => cleanup:
and:

Data-driventests
Withwhere block
where:
bankName << ['BPH', 'BOS', 'HSBC']

Modules
Spock Spring
Annotatespecwith@ContextConfiguration
Use Spring DI (@Autowired, @Resource)
AlmostallTestContextannotationswork
SpockUnitils
Unitils – library of test helpers (mocking, persistence, Spring, …)
Wrapper for DbUnit
Spring integration – was useful whenSpring TestContextwasnotyetimplemented
Notactivelydeveloped

More integrations
SpockGrails & Grailsplugin
http://www.grails.org/plugin/spock
Gebintegration (GebSpec)
http://geb.codehaus.org/manual/latest/integrations.html#spock
Guice, Maven, Tapestry

Enoughtalk, let’scode!
And implement a specification
https://github.com/mgryszko/blog-spock-spring-unitils

Resources
Spock
http://code.google.com/p/spock/
GrooviertestingwithSpock
http://www.slideshare.net/rfletcher/groovier-testing-with-spock
Testing A Legacy Java Application With Groovy, Spock, Spring Test And Unitils
http://mgryszko.wordpress.com/2011/02/15/testing-a-legacy-java-application-with-groovy-spock-spring-test-and-unitils/
Unitils
http://www.unitils.org/

THANK YOU!

Testing legacy apps with Spock

by Marcin Gryszko on Apr 01, 2011

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