text: const expect = require('expect');
  const reduceSuccessive = require('./reduceSuccessive.js');
  
  test('reduceSuccessive is a Function', () => {
    expect(reduceSuccessive).toBeInstanceOf(Function);
  });
  test('Returns the array of successively reduced values', () => {
    expect(reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0)).toEqual([
      0,
      1,
      3,
      6,
      10,
      15,
      21
    ]);
  });
  