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

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

import fill from 'core-js-pure/es/array/fill';

QUnit.test('Array#fill', assert => {
  assert.isFunction(fill);
  const array = Array(5);
  assert.same(fill(array, 5), array);
  assert.deepEqual(fill(Array(5), 5), [5, 5, 5, 5, 5]);
  assert.deepEqual(fill(Array(5), 5, 1), [undefined, 5, 5, 5, 5]);
  assert.deepEqual(fill(Array(5), 5, 1, 4), [undefined, 5, 5, 5, undefined]);
  assert.deepEqual(fill(Array(5), 5, 6, 1), [undefined, undefined, undefined, undefined, undefined]);
  assert.deepEqual(fill(Array(5), 5, -3, 4), [undefined, undefined, 5, 5, undefined]);
  assert.arrayEqual(fill({ length: 5 }, 5), [5, 5, 5, 5, 5]);
  if (STRICT) {
    assert.throws(() => fill(null, 0), TypeError);
    assert.throws(() => fill(undefined, 0), TypeError);
  }
  if (DESCRIPTORS) {
    // eslint-disable-next-line es/no-object-defineproperty -- required for testing
    assert.notThrows(() => fill(Object.defineProperty({
      length: -1,
    }, 0, {
      set() {
        throw new Error();
      },
    })), 'uses ToLength');
  }
});