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58 lines
2.1 KiB
58 lines
2.1 KiB
'use strict';
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/** @type {(t: import('tape').Test) => false | void} */
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// eslint-disable-next-line consistent-return
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module.exports = function runSymbolTests(t) {
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t.equal(typeof Symbol, 'function', 'global Symbol is a function');
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if (typeof Symbol !== 'function') { return false; }
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t.notEqual(Symbol(), Symbol(), 'two symbols are not equal');
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/*
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t.equal(
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Symbol.prototype.toString.call(Symbol('foo')),
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Symbol.prototype.toString.call(Symbol('foo')),
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'two symbols with the same description stringify the same'
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);
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*/
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/*
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var foo = Symbol('foo');
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t.notEqual(
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String(foo),
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String(Symbol('bar')),
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'two symbols with different descriptions do not stringify the same'
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);
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*/
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t.equal(typeof Symbol.prototype.toString, 'function', 'Symbol#toString is a function');
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// t.equal(String(foo), Symbol.prototype.toString.call(foo), 'Symbol#toString equals String of the same symbol');
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t.equal(typeof Object.getOwnPropertySymbols, 'function', 'Object.getOwnPropertySymbols is a function');
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/** @type {{ [k in symbol]?: unknown }} */
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var obj = {};
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var sym = Symbol('test');
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var symObj = Object(sym);
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t.notEqual(typeof sym, 'string', 'Symbol is not a string');
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t.equal(Object.prototype.toString.call(sym), '[object Symbol]', 'symbol primitive Object#toStrings properly');
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t.equal(Object.prototype.toString.call(symObj), '[object Symbol]', 'symbol primitive Object#toStrings properly');
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var symVal = 42;
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obj[sym] = symVal;
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// eslint-disable-next-line no-restricted-syntax, no-unused-vars
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for (var _ in obj) { t.fail('symbol property key was found in for..in of object'); }
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t.deepEqual(Object.keys(obj), [], 'no enumerable own keys on symbol-valued object');
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t.deepEqual(Object.getOwnPropertyNames(obj), [], 'no own names on symbol-valued object');
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t.deepEqual(Object.getOwnPropertySymbols(obj), [sym], 'one own symbol on symbol-valued object');
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t.equal(Object.prototype.propertyIsEnumerable.call(obj, sym), true, 'symbol is enumerable');
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t.deepEqual(Object.getOwnPropertyDescriptor(obj, sym), {
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configurable: true,
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enumerable: true,
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value: 42,
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writable: true
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}, 'property descriptor is correct');
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};
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