es.array.copy-within.js

import { STRICT } from '../helpers/constants';

QUnit.test('Array#copyWithin', assert => {
  const { copyWithin } = Array.prototype;
  assert.isFunction(copyWithin);
  assert.arity(copyWithin, 2);
  assert.name(copyWithin, 'copyWithin');
  assert.looksNative(copyWithin);
  const array = [1];
  assert.same(array.copyWithin(0), array);
  assert.nonEnumerable(Array.prototype, 'copyWithin');
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(0, 3), [4, 5, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(1, 3), [1, 4, 5, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(1, 2), [1, 3, 4, 5, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(2, 2), [1, 2, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(0, 3, 4), [4, 2, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(1, 3, 4), [1, 4, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(1, 2, 4), [1, 3, 4, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(0, -2), [4, 5, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(0, -2, -1), [4, 2, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(-4, -3, -2), [1, 3, 3, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(-4, -3, -1), [1, 3, 4, 4, 5]);
  assert.deepEqual([1, 2, 3, 4, 5].copyWithin(-4, -3), [1, 3, 4, 5, 5]);
  if (STRICT) {
    assert.throws(() => copyWithin.call(null, 0), TypeError);
    assert.throws(() => copyWithin.call(undefined, 0), TypeError);
  }
  assert.true('copyWithin' in Array.prototype[Symbol.unscopables], 'In Array#@@unscopables');
});