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// Setup
    private mockTagLibRender() {
        tagLib.metaClass.render = { Map attrs ->
            render = attrs
        }
    }
    
// Utilization
        given:
        mockTagLibRender()

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libraryDependencies += "org.scalatest" % "scalatest 2.10" % "2.1.0" % "test"

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import grails.test.mixin.Mock
import grails.test.mixin.TestFor
import spock.lang.IgnoreRest
import spock.lang.Specification
import spock.lang.Unroll

@Unroll
@TestFor(UrlMappings)
@Mock([MockYourController])
class UrlMappingsSpec extends Specification {

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log4j = {
   ...
   debug 'org.hibernate.SQL'
   trace 'org.hibernate.type.descriptor.sql.BasicBinder'
}

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@TestFor(MyQuartzJob)
@TestMixin(ControllerUnitTestMixin) // This allows access to grailsApplication
class MyQuartzJobSpec extends Specification {
    def job

    def setup() {
        grailsApplication.config.some.config.stuff = true
        job = new MyQuartzJob()
    }
}

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// Templates rendered by TagLib may be verified as follows

class SomeAwesomeSpec extends Specification {
  public static final String BLAH = "BLAH"

  void "test something"() {
    given:
    groovyPages.put("/path/to/_blah.gsp", BLAH)
    
    when:

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 Collections.emptyList()
 
 // Use Collections.emptyList() when you do not wish to modify the returned list, otherwise []
 // That's what you use if you want to pass a default parameter that will not be modified by the called funciton
 // http://stackoverflow.com/questions/5552258/collections-emptylist-vs-new-instance

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// Convert
myCoolemailService.myEmailService = Mock(MyEmailService)

// to
myCoolemailService.myEmailService = Mock([useObjenesis: false], MyEmailService)

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import org.hibernate.criterion.CriteriaSpecification

BlogEntry.withCriteria {
  maxResults 5
  resultTransformer(CriteriaSpecification.ALIAS_TO_ENTITY_MAP)
  projections {
    count('id', 'total')
    groupProperty('author', 'author')
  }      
}  

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//grails.project.class.dir = "target/classes"
//grails.project.test.class.dir = "target/test-classes"
//grails.project.test.reports.dir = "target/test-reports"
grails.project.work.dir="target"