إختبار الحالات الطرفية بدل المثال السهل فقط

import assert from 'node:assert/strict';
function average(numbers) {
  if (numbers.length === 0) return null;
  if (!numbers.every(Number.isFinite)) throw new TypeError('Numbers Only');
  return numbers.reduce((sum, value) => sum + value, 0) / numbers.length;
}
assert.equal(average([10, 20]), 15);
assert.equal(average([]), null);
assert.equal(average([0]), 0);
assert.throws(() => average(['10']), TypeError);
console.log('4 Checks Passed');

4 Checks Passed