Incompatible mockDomain Return Type

Originally reported on Google Code with ID 194

What steps will reproduce the problem? If possible, provide source code and
stack trace.
1. Create a unit test for testing constraints (see code below)
2. grails test-app :spock

| Error Compilation error compiling [spock] tests: startup failed:
/home/erturne/myapp/test/unit/foo/UserTests.groovy: -1: The return
type of java.lang.Object mockDomain(java.lang.Class, java.util.List)
in foo.UserTests is incompatible with void mockDomain(java.lang.Class,
java.util.List) in grails.plugin.spock.UnitSpec
. At [-1:-1]  @ line -1, column -1.

package foo

import grails.plugin.spock.*
import grails.test.mixin.*

/**
 * See the API for {@link
grails.test.mixin.domain.DomainUnitTestMixin} for usage instructions
 */
@TestFor(User)
class UserTests extends UnitSpec {

       def "first name must not violate constraints"() {
               setup:
               mockForConstraintsTests(User)

               when:
               def user = new User(firstName: firstName, lastName: 'Doe')
               user.validate()

               then:
               user.hasErrors() == !valid

               where:
               firstName               | valid
               null                    | false   // Must not be null
               ''                      | false   // Must not be blank
               '012345678901234567891' | false   // Must not exceed 20 characters
               'John'                  | true    // Okay
       }
}


What version of Spock and Groovy are you using?
Groovy: 1.8
Grails: 2.0.0M1
Spock plugin: 0.6-SNAPSHOT


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Reported by erturne on 2011-08-10 12:14:58

Start with the failing test in test/unit/foo/UserTests.groovy and reproduce it with grails test-app :spock. Trace the mockDomain method on grails.plugin.spock.UnitSpec and the generated UserTests method signature; done means the constraints test compiles without the incompatible return-type error.