java.lang.IllegalStateException: Method on class [sampleplugin.Person] was used outside of a Grails application. If running in the context of a test using the mocking API or bootstrap Grails correctly.
    at org.grails.datastore.gorm.GormEntity$Trait$Helper.currentGormInstanceApi(GormEntity.groovy:52)
    at org.grails.datastore.gorm.GormEntity$Trait$Helper.save(GormEntity.groovy:165)
    at sampleplugin.PersonSpec.$tt__$spock_feature_0_1(PersonSpec.groovy:25)
    at sampleplugin.PersonSpec.test save_closure2(PersonSpec.groovy)
    at groovy.lang.Closure.call(Closure.java:423)
    at groovy.lang.Closure.call(Closure.java:439)
    at grails.transaction.GrailsTransactionTemplate$1.doInTransaction(GrailsTransactionTemplate.groovy:67)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
    at grails.transaction.GrailsTransactionTemplate.executeAndRollback(GrailsTransactionTemplate.groovy:64)
    at sampleplugin.PersonSpec.test save(PersonSpec.groovy)

package sampleplugin

class Person {
    String name
}

package sampleplugin

import grails.test.mixin.integration.Integration
import grails.transaction.*
import spock.lang.*

@Integration
@Rollback
class PersonSpec extends Specification {

  void "canary test"() {
      expect:
          true == true
  }

  void "test save"() {
    when:
      new Person(name: "John Doe").save flush:true
    then:
      1 == Person.count()
  }
}