Spock Spring workaround to using injected Spring beans in Where block

RepositoryTest.groovy

@SpringBootTest(classes = [ApplicationTest.class])
@ActiveProfiles("test")
class RepositoryTest {

	@Autowired
	IDeviceRepository deviceRepository
	@Autowired
	IGroupRepository groupRepository
	@Autowired
	IPlatformRepository platformRepository
	@Autowired
	IUserRepository userRepository

	@Unroll
	def "#repoName Repository is properly injected by Spring container"() {
		given:
			def repo = this."${repoName}Repository"

		when:
			repo.save(instance)
		then:
			repo.findOne(instance.id)

		where:
			repoName   | instance
			"device"   | new Device(token: "token123")
			"group"    | new Group(name: "testGroup")
			"platform" | new Platform(name: "testPlatform")
			"user"     | new User(name: "testUser")
	}
}

Are your I*Repo's JpaRepository extended interfaces?
I'm struggling to get Unroll'd tests running with properly wired Spring Interface-beans.
Could you help me out?