1  'use strict';
 2  
 3  var test = require('tape');
 4  
 5  var getDunderProto = require('../get');
 6  
 7  test('getDunderProto', { skip: !getDunderProto }, function (t) {
 8  	if (!getDunderProto) {
 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 () { getDunderProto(); }, TypeError, 'throws if no argument');
14  	// @ts-expect-error
15  	t['throws'](function () { getDunderProto(undefined); }, TypeError, 'throws with undefined');
16  	// @ts-expect-error
17  	t['throws'](function () { getDunderProto(null); }, TypeError, 'throws with null');
18  
19  	t.equal(getDunderProto({}), Object.prototype);
20  	t.equal(getDunderProto([]), Array.prototype);
21  	t.equal(getDunderProto(function () {}), Function.prototype);
22  	t.equal(getDunderProto(/./g), RegExp.prototype);
23  	t.equal(getDunderProto(42), Number.prototype);
24  	t.equal(getDunderProto(true), Boolean.prototype);
25  	t.equal(getDunderProto('foo'), String.prototype);
26  
27  	t.end();
28  });
29  
30  test('no dunder proto', { skip: !!getDunderProto }, function (t) {
31  	t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
32  
33  	t.end();
34  });