core-js/tests/unit-pure/es.array.slice.js

import { GLOBAL, STRICT } from '../helpers/constants.js';

import Symbol from 'core-js-pure/es/symbol';
import isArray from 'core-js-pure/es/array/is-array';
import slice from 'core-js-pure/es/array/slice';

QUnit.test('Array#slice', assert => {
  assert.isFunction(slice);
  let array = ['1', '2', '3', '4', '5'];
  assert.deepEqual(slice(array), array);
  assert.deepEqual(slice(array, 1, 3), ['2', '3']);
  assert.deepEqual(slice(array, 1, undefined), ['2', '3', '4', '5']);
  assert.deepEqual(slice(array, 1, -1), ['2', '3', '4']);
  assert.deepEqual(slice(array, -2, -1), ['4']);
  assert.deepEqual(slice(array, -2, -3), []);
  const string = '12345';
  assert.deepEqual(slice(string), array);
  assert.deepEqual(slice(string, 1, 3), ['2', '3']);
  assert.deepEqual(slice(string, 1, undefined), ['2', '3', '4', '5']);
  assert.deepEqual(slice(string, 1, -1), ['2', '3', '4']);
  assert.deepEqual(slice(string, -2, -1), ['4']);
  assert.deepEqual(slice(string, -2, -3), []);
  const list = GLOBAL.document && document.body && document.body.childNodes;
  if (list) {
    assert.notThrows(() => isArray(slice(list)), 'works with NodeList');
  }
  if (STRICT) {
    assert.throws(() => slice(null), TypeError);
    assert.throws(() => slice(undefined), TypeError);
  }
  array = [];
  // eslint-disable-next-line object-shorthand -- constructor
  array.constructor = { [Symbol.species]: function () {
    return { foo: 1 };
  } };
  assert.same(slice(array).foo, 1, '@@species');
});