const expect = require('expect');
const quickSort = require('./quickSort.js');


  test('quickSort is a Function', () => {
  expect(quickSort).toBeInstanceOf(Function);
});
  test('quickSort([5, 6, 4, 3, 1, 2]) returns [1, 2, 3, 4, 5, 6]', () => {
  expect(quickSort([5, 6, 4, 3, 1, 2]), [1, 2, 3, 4, 5, 6]).toEqual()
});
  test('quickSort([-1, 0, -2]) returns [-2, -1, 0]', () => {
  expect(quickSort([-1, 0, -2]), [-2, -1, 0]).toEqual()
});
  t.throws(() => quickSort(), 'quickSort() throws an error');
  t.throws(() => quickSort(123), 'quickSort(123) throws an error');
  t.throws(() => quickSort({ 234: string}), 'quickSort({ 234: string}) throws an error');
  t.throws(() => quickSort(null), 'quickSort(null) throws an error');
  t.throws(() => quickSort(undefined), 'quickSort(undefined) throws an error');

  let start = new Date().getTime();
  quickSort([11, 1, 324, 23232, -1, 53, 2, 524, 32, 13, 156, 133, 62, 12, 4]);
  let end = new Date().getTime();
  test('quickSort([11, 1, 324, 23232, -1, 53, 2, 524, 32, 13, 156, 133, 62, 12, 4]) takes less than 2s to run', () => {
  expect((end - start) < 2000).toBeTruthy();
});