describe('Utils', () => {
  let arr;
  const { reverse } = require('./../utils.js');

  beforeEach(() => {
    arr = [1, 2, 3, 10, 50];
  });

  describe('reverse should', () => {
    it('return a new array', () => {
      // Arrange & Act
      let newArr = [];
      const reversed=arr.forEach((acc)=> newArr.unshift(acc));

      // Assert
      expect(arr).not.toEqual(newArr);
    });

    it('return an array with reversed elements', () => {
      // Arrange & Act
      let newArr=[];
      const reversed=arr.forEach((acc)=> newArr.unshift(acc));

      // Assert
      expect(newArr[0]).toEqual(arr[4]);
      expect(newArr[1]).toEqual(arr[3]);
      expect(newArr[2]).toEqual(arr[2]);
      expect(newArr[3]).toEqual(arr[1]);
      expect(newArr[4]).toEqual(arr[0]);
    });
  });
});