return configuration;
    }
  }

  // Tests for Scheduler:

  // These constants are arbitrary and just used to make sure that the correct method is called
  // with the correct parameters.
  private static final int INITIAL_DELAY = 10;
  private static final int DELAY = 20;
  private static final TimeUnit UNIT = MILLISECONDS;

  // Unique runnable object used for comparison.

      return configuration;
    }
  }

  // Tests for Scheduler:

  // These constants are arbitrary and just used to make sure that the correct method is called
  // with the correct parameters.
  private static final int INITIAL_DELAY = 10;
  private static final int DELAY = 20;
  private static final TimeUnit UNIT = MILLISECONDS;

  // Unique runnable object used for comparison.