OneTimeDataExample.groovy

@TestFor(MyController)
@TestMixin(OneTimeDataUnitTestMixin)
class MyControllerSpec extends Specification {

  def setup() {
    mockOneTimeData(this, controller)
  }
  
  def "should fail"() {
    given:
      params.valid = false
    when:
      controller.index()
    then:
      otdData.message == "failed!"
  }
  
}