6   assertEquals(Array.prototype.copyWithin.length, 2);
12   assertArrayEquals([4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, 3));
13   assertArrayEquals([1, 4, 5, 4, 5], [1, 2, 3, 4, 5].copyWithin(1, 3));
14   assertArrayEquals([1, 3, 4, 5, 5], [1, 2, 3, 4, 5].copyWithin(1, 2));
15   assertArrayEquals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(2, 2));
21   assertArrayEquals([1, 2, 3, 4, 5].copyWithin(0, 3, 4), [4, 2, 3, 4, 5]);
22   assertArrayEquals([1, 2, 3, 4, 5].copyWithin(1, 3, 4), [1, 4, 3, 4, 5]);
23   assertArrayEquals([1, 2, 3, 4, 5].copyWithin(1, 2, 4), [1, 3, 4, 4, 5]);
29   assertArrayEquals([4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, -2));
30   assertArrayEquals([4, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, -2, -1));
31   assertArrayEquals([1, 3, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(-4, -3, -2));
32   assertArrayEquals([1, 3, 4, 4, 5], [1, 2, 3, 4, 5].copyWithin(-4, -3, -1));
33   assertArrayEquals([1, 3, 4, 5, 5], [1, 2, 3, 4, 5].copyWithin(-4, -3));
35   assertArrayEquals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(-5, 0));
42   Array.prototype.copyWithin.call(args, -2, 0);  method in Array
53     return Array.prototype.copyWithin.call(null, 0, 3);  method in Array
60     return Array.prototype.copyWithin.call(undefined, 0, 3);  method in Array
77   assertEquals(34, Array.prototype.copyWithin.call(34, 0, 3).valueOf());
84   assertEquals(sym, Array.prototype.copyWithin.call(sym, 0, 3).valueOf());
96                     Array.prototype.copyWithin.call(int32View, 0, 1));
103     [].copyWithin.call(arguments, 1, 3);
112   assertArrayEquals([1, 2, 3, 1, 2], [1, 2, 3, 4, 5].copyWithin(3, 0));
115   assertArrayEquals([1, 2, 3, 1, 2], [1, 2, 3, 4, 5].copyWithin(3, 0, 4));
125   assertArrayEquals([, 4, , , 4, , ], arr.copyWithin(0, 3));
135   }, Array.prototype.copyWithin.call({
146   assertArrayEquals([4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0.2, 3.9));
152   assertArrayEquals([4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(-0, 3));
158   assertArrayEquals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, 7));
161   assertArrayEquals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(-7, 0));
167   assertArrayEquals([], [].copyWithin(0, 3));
173   assertArrayEquals([1, 2, 2, 3, 4], [1, 2, 3, 4, 5].copyWithin(2, 1, 4));
180   arr.copyWithin(2, 1, 4);
181   assertArrayEquals([1, 2, 2, 2, 3], arr.copyWithin(2, 1, 4));
188     return Object.freeze([1, , 3, , 4, 5]).copyWithin(2, 1, 4);
193     return Object.seal([1, , 3, , 4, 5]).copyWithin(2, 1, 4);
198     return Object.preventExtensions([1, , 3, , 4, 5]).copyWithin(2, 1, 4);
206     return Object.freeze([1, 2, 3, 4, 5]).copyWithin(0, 3);
211     return Object.seal([, 2, 3, 4, 5]).copyWithin(0, 3);
216     return Object.preventExtensions([ , 2, 3, 4, 5]).copyWithin(0, 3);
231     return arr.copyWithin(1, 3);
241       [4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, 3, undefined));
254   Array.prototype.copyWithin.call(arr, 1, 3);  method in Array
257   Array.prototype.copyWithin.call(arr, 1, 3, 4);  method in Array
267   assertArrayEquals(arr, arr.copyWithin(45, 9000));
278   assertArrayEquals(expected, arr.copyWithin(45, 9000));
284   arr.copyWithin(45, 9000);
306   Array.prototype.copyWithin.call(object, 1, large - 10);  method in Array
323   assertArrayEquals([1, 2, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, 3, null));
330   assertArrayEquals([4, 5, 3, 4, 5], [1, 2, 3, 4, 5].copyWithin(0, 3));
334   assertArrayEquals(["FAKE", 5, 3, "FAKE", 5], [1, 2, 3, , 5].copyWithin(0, 3));