Groovy Mocks do not support isProperty() style getters for booleans

[mlasevich]

Related, (but not the same as) #1256

When testing using a GroovyMock/GroovyStub/GroovySpy - isProperty() style getters are not respected, and only getProperty() is used.

Tested under org.spockframework:spock-core:1.3-groovy-2.4

To reproduce:

import spock.lang.Specification

class TesterSpec extends Specification {

  static class Tester {

    boolean isEnabled() {
      return true
    }
  }

  def 'Works'() {
    given:
      Tester x = new Tester()
    expect:
      x.enabled == true
  }

  def 'GroovySpy does not work Test'() {
    given:
      Tester x = GroovySpy(Tester)
    expect:
      x.enabled == true
  }

  def 'GroovyMock does not work either Test'(){
    given:
      Tester x = GroovyMock(Tester)
    when:
      x.enabled
    then:
      1 * x.isEnabled() >> true
  }

  def 'Mock works though Test'(){
    given:
      Tester x = Mock(Tester)
    when:
      x.enabled
    then:
      1 * x.isEnabled() >> true
  }
}

[kriegaex]

Like I said in the other issue, the same thing happens in Spock 2.0-M4 and in the master branch after #1256 was merged in already.