| 1 | describe('JSON', function () {
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| 2 | var functionsHaveNames = (function foo() {}).name === 'foo';
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| 3 | var ifFunctionsHaveNamesIt = functionsHaveNames ? it : xit;
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| 4 | var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
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| 5 | var ifSymbolsIt = hasSymbols ? it : xit;
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| 6 | var ifSymbolsDescribe = hasSymbols ? describe : xit;
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| 7 |
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| 8 | describe('.stringify()', function () {
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| 9 | ifFunctionsHaveNamesIt('has the right name', function () {
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| 10 | expect(JSON.stringify.name).to.equal('stringify');
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| 11 | });
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| 12 |
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| 13 | ifSymbolsIt('serializes a Symbol to undefined', function () {
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| 14 | expect(JSON.stringify(Symbol())).to.equal(undefined);
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| 15 | });
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| 16 |
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| 17 | ifSymbolsIt('serializes a Symbol object to {}', function () {
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| 18 | expect(function stringifyObjectSymbol() { JSON.stringify(Object(Symbol())); }).not.to['throw']();
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| 19 | expect(JSON.stringify(Object(Symbol()))).to.equal('{}');
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| 20 | });
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| 21 |
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| 22 | ifSymbolsIt('serializes Symbols in an Array to null', function () {
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| 23 | expect(JSON.stringify([Symbol('foo')])).to.equal('[null]');
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| 24 | });
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| 25 |
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| 26 | ifSymbolsIt('serializes Symbol objects in an Array to {}', function () {
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| 27 | expect(function stringifyObjectSymbolInArray() { JSON.stringify([Object(Symbol('foo'))]); }).not.to['throw']();
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| 28 | expect(JSON.stringify([Object(Symbol('foo'))])).to.equal('[{}]');
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| 29 | });
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| 30 |
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| 31 | ifSymbolsDescribe('skips symbol properties and values in an object', function () {
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| 32 | var enumSym = Symbol('enumerable');
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| 33 | var nonenum = Symbol('non-enumerable');
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| 34 | var createObject = function () {
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| 35 | var obj = { a: 1 };
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| 36 | obj[enumSym] = true;
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| 37 | obj.sym = enumSym;
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| 38 | Object.defineProperty(obj, nonenum, { enumerable: false, value: true });
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| 39 | expect(Object.getOwnPropertySymbols(obj)).to.eql([enumSym, nonenum]);
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| 40 | return obj;
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| 41 | };
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| 42 |
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| 43 | it('works with no replacer', function () {
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| 44 | var obj = createObject();
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| 45 | expect(JSON.stringify(obj)).to.equal('{"a":1}');
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| 46 | expect(JSON.stringify(obj, null, '|')).to.equal('{\n|"a": 1\n}');
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| 47 | });
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| 48 |
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| 49 | it('works with a replacer function', function () {
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| 50 | var tuples = [];
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| 51 | var replacer = function (key, value) {
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| 52 | tuples.push([this, key, value]);
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| 53 | return value;
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| 54 | };
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| 55 | var obj = createObject();
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| 56 | expect(JSON.stringify(obj, replacer, '|')).to.equal('{\n|"a": 1\n}');
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| 57 | expect(tuples).to.eql([
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| 58 | [{ '': obj }, '', obj],
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| 59 | [obj, 'a', 1],
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| 60 | [obj, 'sym', enumSym]
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| 61 | ]);
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| 62 | });
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| 63 |
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| 64 | it('works with a replacer array', function () {
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| 65 | var obj = createObject();
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| 66 | obj.foo = 'bar';
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| 67 | obj[Symbol.prototype.toString.call(enumSym)] = 'tricksy';
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| 68 | expect(JSON.stringify(obj, ['a', enumSym])).to.equal('{"a":1}');
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| 69 | expect(JSON.stringify(obj, ['a', enumSym], '|')).to.equal('{\n|"a": 1\n}');
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| 70 | });
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| 71 |
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| 72 | it('ignores a non-array non-callable replacer object', function () {
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| 73 | expect(JSON.stringify('z', { test: null })).to.equal('"z"');
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| 74 | });
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| 75 | });
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| 76 | });
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| 77 | });
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