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50 lines
1.7 KiB
50 lines
1.7 KiB
'use strict'; |
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var test = require('tape'); |
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var setDunderProto = require('../set'); |
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test('setDunderProto', { skip: !setDunderProto }, function (t) { |
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if (!setDunderProto) { |
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throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal |
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} |
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// @ts-expect-error |
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t['throws'](function () { setDunderProto(); }, TypeError, 'throws if no arguments'); |
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// @ts-expect-error |
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t['throws'](function () { setDunderProto(undefined); }, TypeError, 'throws with undefined and nothing'); |
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// @ts-expect-error |
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t['throws'](function () { setDunderProto(undefined, undefined); }, TypeError, 'throws with undefined and undefined'); |
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// @ts-expect-error |
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t['throws'](function () { setDunderProto(null); }, TypeError, 'throws with null and undefined'); |
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// @ts-expect-error |
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t['throws'](function () { setDunderProto(null, undefined); }, TypeError, 'throws with null and undefined'); |
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/** @type {{ inherited?: boolean }} */ |
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var obj = {}; |
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t.ok('toString' in obj, 'object initially has toString'); |
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setDunderProto(obj, null); |
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t.notOk('toString' in obj, 'object no longer has toString'); |
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t.notOk('inherited' in obj, 'object lacks inherited property'); |
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setDunderProto(obj, { inherited: true }); |
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t.equal(obj.inherited, true, 'object has inherited property'); |
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t.end(); |
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}); |
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test('no dunder proto', { skip: !!setDunderProto }, function (t) { |
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if ('__proto__' in Object.prototype) { |
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t['throws']( |
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// @ts-expect-error |
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function () { ({}).__proto__ = null; }, // eslint-disable-line no-proto |
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Error, |
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'throws when setting Object.prototype.__proto__' |
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); |
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} else { |
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t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype'); |
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} |
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t.end(); |
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});
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