1-showelem.test

({
  name: 'deepSum',
  length: [150, 230],
  cases: [
    [[1, 2, 3], 6],
    [[0], 0],
    [[1, -1, 1], 1],
    [[10, -1, -1, -1], 7],
    [[1, [2, 3, [4, [5]]], 6, [33]], 54],
  ],
  test(deepSum) {
    const src = deepSum.toString();
    const numbers = [1, 'string', [12, 3]];
    const sum = deepSum(numbers);
    if (isNaN(sum)) throw new Error('Do not add string');
    if (!src.includes('deepSum(')) throw new Error('Use recursion');
    if (!src.includes('return')) throw new Error('Use return');
   }
})