public boolean isUseObjenesis() {
    return useObjenesis;
  }
Tells whether class-based mock objects should be instantiated with the Objenesis library (if available),
or by calling a real constructor.

@return whether class-based mock objects should be instantiated with the Objenesis library (if available),
or by calling a real constructor
spock-core/src/main/java/org/spockframework/mock/MockNature.java