text: import { NotImplementedError } from '../extensions/index.js';
  
  /**
   * Extract season from given date and expose the enemy scout!
   * 
   * @param {Date | FakeDate} date real or fake date
   * @returns {String} time of the year
   * 
   * @example
   * 
   * getSeason(new Date(2020, 02, 31)) => 'spring'
   * 
   */
  export default function getSeason(date) {
    if (!date){
       return 'Unable to determine the time of year!';
    }
    const invalid = Date.parse(date)
    if (isNaN(invalid) || Object.keys(date).length > 0) {
      throw new Error('Invalid date!')
    }
    let month = date.getMonth();
    if (month >= 2 && month <= 4) {
      return 'spring';
    } else if (month >= 5 && month <= 7) {
      return 'summer';
    } else if (month >= 8 && month <= 10) {
      return 'autumn';
    } else {
      return 'winter';
    }
  }
  