text: function sum(arr) {
      let sum = 0;
      for(let num of arr){
          sum += Number(num);
      }
      return sum;
  }
  
  
  describe('Test summator', function () {
      it('Should return 3 for [1,2]', function () {
          let expercted = 3;
          let actual = sum([1,2]);
          if(expercted !== actual){
              throw new Error('3 != 1+2');
          }
      })
  });