How to use

copyWithin

function

in

Array

it('modifies the object in-place', function () {
  var arr = [1, 2, 3, 4, 5];
  proclaim.deepStrictEqual(arr.copyWithin(0, 3), [4, 5, 3, 4, 5]);
  proclaim.deepStrictEqual(arr, [4, 5, 3, 4, 5]);
});

it('works with arraylike objects', function () {
  var args = (function () { return arguments; }(1, 2, 3));
  var argsClass = Object.prototype.toString.call(args);
  proclaim.deepStrictEqual(Array.prototype.slice.call(args), [1, 2, 3]);
  Array.prototype.copyWithin.call(args, -2, 0);
  proclaim.deepStrictEqual(Array.prototype.slice.call(args), [1, 1, 2]);
  proclaim.strictEqual(Object.prototype.toString.call(args), argsClass);
});

it('should check inherited properties as well', function () {
  var Parent = function Parent() {};
  Parent.prototype[0] = 'foo';
  var sparse = new Parent();
  sparse[1] = 1;
  sparse[2] = 2;
  sparse.length = 3;
  var result = Array.prototype.copyWithin.call(sparse, 1, 0);
  proclaim.ok(result['0']);
  proclaim.notOk(Object.prototype.hasOwnProperty.call(result, '0'));
  proclaim.isTrue(Object.prototype.hasOwnProperty.call(result, '1'));
  proclaim.deepEqual(result[0], 'foo');
  proclaim.deepEqual(result[1], 'foo');
  proclaim.deepEqual(result[2], 1);
  proclaim.deepEqual(result.length, 3 );
});

it('throws if called with null context', function () {
    proclaim["throws"](function () {
      return Array.prototype.copyWithin.call(null, 0);
    }, TypeError);
  });

/* globals proclaim */

it('is a function', function () {
  proclaim.isFunction(Array.prototype.copyWithin);
});

it('has correct arity', function () {
  proclaim.arity(Array.prototype.copyWithin, 2);
});

it('has correct name', function () {
  proclaim.hasName(Array.prototype.copyWithin, 'copyWithin');
});

it('throws if called with undefined context', function () {
    proclaim["throws"](function () {
      return Array.prototype.copyWithin.call(undefined, 0);
    }, TypeError);
  });