source: imaps-frontend/node_modules/dunder-proto/test/set.js@ 79a0317

'use strict';

var test = require('tape');

var setDunderProto = require('../set');

test('setDunderProto', { skip: !setDunderProto }, function (t) {
        if (!setDunderProto) {
                throw 'should never happen; this is just for type narrowing'; // eslint-disable-line no-throw-literal
        }

        // @ts-expect-error
        t['throws'](function () { setDunderProto(); }, TypeError, 'throws if no arguments');
        // @ts-expect-error
        t['throws'](function () { setDunderProto(undefined); }, TypeError, 'throws with undefined and nothing');
        // @ts-expect-error
        t['throws'](function () { setDunderProto(undefined, undefined); }, TypeError, 'throws with undefined and undefined');
        // @ts-expect-error
        t['throws'](function () { setDunderProto(null); }, TypeError, 'throws with null and undefined');
        // @ts-expect-error
        t['throws'](function () { setDunderProto(null, undefined); }, TypeError, 'throws with null and undefined');

        /** @type {{ inherited?: boolean }} */
        var obj = {};
        t.ok('toString' in obj, 'object initially has toString');

        setDunderProto(obj, null);
        t.notOk('toString' in obj, 'object no longer has toString');

        t.notOk('inherited' in obj, 'object lacks inherited property');
        setDunderProto(obj, { inherited: true });
        t.equal(obj.inherited, true, 'object has inherited property');

        t.end();
});

test('no dunder proto', { skip: !!setDunderProto }, function (t) {
        if ('__proto__' in Object.prototype) {
                t['throws'](
                        // @ts-expect-error
                        function () { ({}).__proto__ = null; }, // eslint-disable-line no-proto
                        Error,
                        'throws when setting Object.prototype.__proto__'
                );
        } else {
                t.notOk('__proto__' in Object.prototype, 'no __proto__ in Object.prototype');
        }

        t.end();
});