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56 lines
2.0 KiB
56 lines
2.0 KiB
'use strict'; |
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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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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 |
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for (sym 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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