source: imaps-frontend/node_modules/has-symbols/test/tests.js@ 79a0317

'use strict';

/** @type {(t: import('tape').Test) => false | void} */
// eslint-disable-next-line consistent-return
module.exports = function runSymbolTests(t) {
        t.equal(typeof Symbol, 'function', 'global Symbol is a function');

        if (typeof Symbol !== 'function') { return false; }

        t.notEqual(Symbol(), Symbol(), 'two symbols are not equal');

        /*
        t.equal(
                Symbol.prototype.toString.call(Symbol('foo')),
                Symbol.prototype.toString.call(Symbol('foo')),
                'two symbols with the same description stringify the same'
        );
        */

        /*
        var foo = Symbol('foo');

        t.notEqual(
                String(foo),
                String(Symbol('bar')),
                'two symbols with different descriptions do not stringify the same'
        );
        */

        t.equal(typeof Symbol.prototype.toString, 'function', 'Symbol#toString is a function');
        // t.equal(String(foo), Symbol.prototype.toString.call(foo), 'Symbol#toString equals String of the same symbol');

        t.equal(typeof Object.getOwnPropertySymbols, 'function', 'Object.getOwnPropertySymbols is a function');

        /** @type {{ [k in symbol]?: unknown }} */
        var obj = {};
        var sym = Symbol('test');
        var symObj = Object(sym);
        t.notEqual(typeof sym, 'string', 'Symbol is not a string');
        t.equal(Object.prototype.toString.call(sym), '[object Symbol]', 'symbol primitive Object#toStrings properly');
        t.equal(Object.prototype.toString.call(symObj), '[object Symbol]', 'symbol primitive Object#toStrings properly');

        var symVal = 42;
        obj[sym] = symVal;
        // eslint-disable-next-line no-restricted-syntax, no-unused-vars
        for (var _ in obj) { t.fail('symbol property key was found in for..in of object'); }

        t.deepEqual(Object.keys(obj), [], 'no enumerable own keys on symbol-valued object');
        t.deepEqual(Object.getOwnPropertyNames(obj), [], 'no own names on symbol-valued object');
        t.deepEqual(Object.getOwnPropertySymbols(obj), [sym], 'one own symbol on symbol-valued object');
        t.equal(Object.prototype.propertyIsEnumerable.call(obj, sym), true, 'symbol is enumerable');
        t.deepEqual(Object.getOwnPropertyDescriptor(obj, sym), {
                configurable: true,
                enumerable: true,
                value: 42,
                writable: true
        }, 'property descriptor is correct');
};