code: public static void setInternalState(Object object, String fieldName, Object value, Class<?> where) {
  		WhiteboxImpl.setInternalState(object, fieldName, value, where);
  	}
docs: Set the value of a field using reflection. Use this method when you need
  to specify in which class the field is declared. This might be useful
  when you have mocked the instance you are trying to modify.
  
  @param object
  the object to modify
  @param fieldName
  the name of the field
  @param value
  the new value of the field
  @param where
  the class in the hierarchy where the field is defined