private SpecInfo doBuild() {
    buildSuperSpec();
    buildSpec();
    buildFields();
    buildFeatures();
    buildInitializerMethods();
    buildFixtureMethods();
    return spec;
  }
Builds a SpecInfo from a Class instance.

@author Peter Niederwieser
spock-core/src/main/java/org/spockframework/runtime/SpecInfoBuilder.java