51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
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'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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