Accesses `tessels` in closure
function logAndFinish(tessel) {
      // The Tessels in `tessels` that we won't be using MUST
      // have their connections closed
      /* istanbul ignore else */
      if (tessel) {
        log.info(`Connected to ${tessel.displayName}.`);
        controller.closeTesselConnections(tessels.filter(closable => closable !== tessel))
          .then(() => resolve(tessel));
      } else {
        log.info('Please specify a Tessel by name [--name <tessel name>]');
        controller.closeTesselConnections(tessels)
          .then(() => reject('Multiple possible Tessel connections found.'));
      }
    }