107 lines
2.9 KiB
JavaScript
107 lines
2.9 KiB
JavaScript
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'use strict';
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var test = require('tape');
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var isSymbol = require('../index');
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var forEach = function (arr, func) {
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var i;
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for (i = 0; i < arr.length; ++i) {
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func(arr[i], i, arr);
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}
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};
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
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var debug = function (value, msg) {
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var output = '';
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if (hasSymbols) {
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try { output += String(value); }
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catch (e) { output += Symbol.prototype.toString.call(value); }
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if (output === '') {
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output = JSON.stringify(value);
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}
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}
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var type = Object.prototype.toString.call(value).toLowerCase().slice(8, -1);
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output += ' (' + type;
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var typeOf = typeof value;
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if (type !== typeOf) {
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output += ', typeof: ' + typeOf;
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}
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return output + ') ' + msg;
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};
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test('non-symbol values', function (t) {
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var nonSymbols = [
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true,
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false,
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Object(true),
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Object(false),
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null,
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undefined,
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{},
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[],
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/a/g,
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'string',
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42,
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new Date(),
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function () {},
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NaN
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];
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t.plan(nonSymbols.length);
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forEach(nonSymbols, function (nonSymbol) {
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t.equal(false, isSymbol(nonSymbol), debug(nonSymbol, 'is not a symbol'));
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});
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t.end();
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});
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test('faked symbol values', function (t) {
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t.test('real symbol valueOf', { skip: !hasSymbols }, function (st) {
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var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
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st.equal(false, isSymbol(fakeSymbol), 'object with valueOf returning a symbol is not a symbol');
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st.end();
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});
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t.test('faked @@toStringTag', { skip: !hasSymbols || !Symbol.toStringTag }, function (st) {
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var fakeSymbol = { valueOf: function () { return Symbol('foo'); } };
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fakeSymbol[Symbol.toStringTag] = 'Symbol';
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st.equal(false, isSymbol(fakeSymbol), 'object with fake Symbol @@toStringTag and valueOf returning a symbol is not a symbol');
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var notSoFakeSymbol = { valueOf: function () { return 42; } };
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notSoFakeSymbol[Symbol.toStringTag] = 'Symbol';
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st.equal(false, isSymbol(notSoFakeSymbol), 'object with fake Symbol @@toStringTag and valueOf not returning a symbol is not a symbol');
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st.end();
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});
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var fakeSymbolString = { toString: function () { return 'Symbol(foo)'; } };
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t.equal(false, isSymbol(fakeSymbolString), 'object with toString returning Symbol(foo) is not a symbol');
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t.end();
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});
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test('Symbol support', { skip: !hasSymbols }, function (t) {
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t.test('well-known Symbols', function (st) {
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var wellKnownSymbols = Object.getOwnPropertyNames(Symbol).filter(function filterer(name) {
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return name !== 'for' && name !== 'keyFor' && !(name in filterer);
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});
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wellKnownSymbols.forEach(function (name) {
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var sym = Symbol[name];
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st.equal(true, isSymbol(sym), debug(sym, ' is a symbol'));
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});
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st.end();
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});
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t.test('user-created symbols', function (st) {
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var symbols = [
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Symbol(),
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Symbol('foo'),
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Symbol.for('foo'),
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Object(Symbol('object'))
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];
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symbols.forEach(function (sym) {
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st.equal(true, isSymbol(sym), debug(sym, ' is a symbol'));
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});
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st.end();
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});
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t.end();
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});
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