| 1 | 'use strict';
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| 2 |
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| 3 | /** @type {(t: import('tape').Test) => false | void} */
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| 4 | // eslint-disable-next-line consistent-return
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| 5 | module.exports = function runSymbolTests(t) {
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| 6 | t.equal(typeof Symbol, 'function', 'global Symbol is a function');
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| 7 |
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| 8 | if (typeof Symbol !== 'function') { return false; }
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| 9 |
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| 10 | t.notEqual(Symbol(), Symbol(), 'two symbols are not equal');
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| 11 |
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| 12 | /*
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| 13 | t.equal(
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| 14 | Symbol.prototype.toString.call(Symbol('foo')),
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| 15 | Symbol.prototype.toString.call(Symbol('foo')),
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| 16 | 'two symbols with the same description stringify the same'
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| 17 | );
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| 18 | */
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| 19 |
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| 20 | /*
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| 21 | var foo = Symbol('foo');
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| 22 |
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| 23 | t.notEqual(
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| 24 | String(foo),
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| 25 | String(Symbol('bar')),
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| 26 | 'two symbols with different descriptions do not stringify the same'
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| 27 | );
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| 28 | */
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| 29 |
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| 30 | t.equal(typeof Symbol.prototype.toString, 'function', 'Symbol#toString is a function');
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| 31 | // t.equal(String(foo), Symbol.prototype.toString.call(foo), 'Symbol#toString equals String of the same symbol');
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| 32 |
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| 33 | t.equal(typeof Object.getOwnPropertySymbols, 'function', 'Object.getOwnPropertySymbols is a function');
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| 34 |
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| 35 | /** @type {{ [k in symbol]?: unknown }} */
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| 36 | var obj = {};
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| 37 | var sym = Symbol('test');
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| 38 | var symObj = Object(sym);
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| 39 | t.notEqual(typeof sym, 'string', 'Symbol is not a string');
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| 40 | t.equal(Object.prototype.toString.call(sym), '[object Symbol]', 'symbol primitive Object#toStrings properly');
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| 41 | t.equal(Object.prototype.toString.call(symObj), '[object Symbol]', 'symbol primitive Object#toStrings properly');
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| 42 |
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| 43 | var symVal = 42;
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| 44 | obj[sym] = symVal;
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| 45 | // eslint-disable-next-line no-restricted-syntax, no-unused-vars
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| 46 | for (var _ in obj) { t.fail('symbol property key was found in for..in of object'); }
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| 47 |
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| 48 | t.deepEqual(Object.keys(obj), [], 'no enumerable own keys on symbol-valued object');
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| 49 | t.deepEqual(Object.getOwnPropertyNames(obj), [], 'no own names on symbol-valued object');
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| 50 | t.deepEqual(Object.getOwnPropertySymbols(obj), [sym], 'one own symbol on symbol-valued object');
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| 51 | t.equal(Object.prototype.propertyIsEnumerable.call(obj, sym), true, 'symbol is enumerable');
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| 52 | t.deepEqual(Object.getOwnPropertyDescriptor(obj, sym), {
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| 53 | configurable: true,
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| 54 | enumerable: true,
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| 55 | value: 42,
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| 56 | writable: true
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| 57 | }, 'property descriptor is correct');
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| 58 | };
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