text: function alphabetSubsequence(str) {
    //  write code here.
  }
  
  
  
  /**
  * Test Suite
  */
  describe('alphabetSubsequence()', () => {
    it('returns false when it has duplicate letters', () => {
        // arrange
        const str = 'effg';
  
        // act
        const result = alphabetSubsequence(str);
  
        // log
        console.log("result 1: ", result);
  
        // assert
        expect(result).toBe(false);
    });
  
    it('returns false when NOT in ascending a - z order', () => {
        // arrange
        const str = 'cdce';
  
        // act
        const result = alphabetSubsequence(str);
  
        // log
        console.log("result 2: ", result);
  
        // assert
        expect(result).toBe(false);
    });
  
    it('returns true whenno duplicates and is ascending a - z order ', () => {
        // arrange
        const str = 'ace';
  
        // act
        const result = alphabetSubsequence(str);
  
        // log
        console.log("result 3: ", result);
  
        // assert
        expect(result).toBe(true);
    });
  });
  