if (!features.contains(implied) && impliedSet.add(implied)) {
          queue.add(implied);
        }
      }
    }
    return impliedSet;
  }

  /**
   * Get the full set of requirements for a tester class.
   *
   * @param testerClass a tester class
   * @return all the constraints implicitly or explicitly required by the class or any of its
   *     superclasses.

        if (!features.contains(implied) && impliedSet.add(implied)) {
          queue.add(implied);
        }
      }
    }
    return impliedSet;
  }

  /**
   * Get the full set of requirements for a tester class.
   *
   * @param testerClass a tester class
   * @return all the constraints implicitly or explicitly required by the class or any of its
   *     superclasses.