1  'use strict';
 2  
 3  var test = require('tape');
 4  
 5  var setDunderProto = require('../set');
 6  
 7  test('setDunderProto', { skip: !setDunderProto }, function (t) {
 8  	if (!setDunderProto) {
 9  		throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
10  	}
11  
12  	// @ts-expect-error
13  	t['throws'](function () { setDunderProto(); }, TypeError, 'throws if no arguments');
14  	// @ts-expect-error
15  	t['throws'](function () { setDunderProto(undefined); }, TypeError, 'throws with undefined and nothing');
16  	// @ts-expect-error
17  	t['throws'](function () { setDunderProto(undefined, undefined); }, TypeError, 'throws with undefined and undefined');
18  	// @ts-expect-error
19  	t['throws'](function () { setDunderProto(null); }, TypeError, 'throws with null and undefined');
20  	// @ts-expect-error
21  	t['throws'](function () { setDunderProto(null, undefined); }, TypeError, 'throws with null and undefined');
22  
23  	/** @type {{ inherited?: boolean }} */
24  	var obj = {};
25  	t.ok('toString' in obj, 'object initially has toString');
26  
27  	setDunderProto(obj, null);
28  	t.notOk('toString' in obj, 'object no longer has toString');
29  
30  	t.notOk('inherited' in obj, 'object lacks inherited property');
31  	setDunderProto(obj, { inherited: true });
32  	t.equal(obj.inherited, true, 'object has inherited property');
33  
34  	t.end();
35  });
36  
37  test('no dunder proto', { skip: !!setDunderProto }, function (t) {
38  	if ('__proto__' in Object.prototype) {
39  		t['throws'](
40  			// @ts-expect-error
41  			function () { ({}).__proto__ = null; }, // eslint-disable-line no-proto
42  			Error,
43  			'throws when setting Object.prototype.__proto__'
44  		);
45  	} else {
46  		t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
47  	}
48  
49  	t.end();
50  });