78 lines
3.0 KiB
JavaScript
78 lines
3.0 KiB
JavaScript
describe('JSON', function () {
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var functionsHaveNames = (function foo() {}).name === 'foo';
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var ifFunctionsHaveNamesIt = functionsHaveNames ? it : xit;
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var hasSymbols = typeof Symbol === 'function' && typeof Symbol() === 'symbol';
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var ifSymbolsIt = hasSymbols ? it : xit;
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var ifSymbolsDescribe = hasSymbols ? describe : xit;
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describe('.stringify()', function () {
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ifFunctionsHaveNamesIt('has the right name', function () {
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expect(JSON.stringify.name).to.equal('stringify');
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});
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ifSymbolsIt('serializes a Symbol to undefined', function () {
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expect(JSON.stringify(Symbol())).to.equal(undefined);
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});
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ifSymbolsIt('serializes a Symbol object to {}', function () {
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expect(function stringifyObjectSymbol() { JSON.stringify(Object(Symbol())); }).not.to['throw']();
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expect(JSON.stringify(Object(Symbol()))).to.equal('{}');
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});
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ifSymbolsIt('serializes Symbols in an Array to null', function () {
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expect(JSON.stringify([Symbol('foo')])).to.equal('[null]');
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});
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ifSymbolsIt('serializes Symbol objects in an Array to {}', function () {
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expect(function stringifyObjectSymbolInArray() { JSON.stringify([Object(Symbol('foo'))]); }).not.to['throw']();
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expect(JSON.stringify([Object(Symbol('foo'))])).to.equal('[{}]');
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});
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ifSymbolsDescribe('skips symbol properties and values in an object', function () {
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var enumSym = Symbol('enumerable');
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var nonenum = Symbol('non-enumerable');
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var createObject = function () {
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var obj = { a: 1 };
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obj[enumSym] = true;
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obj.sym = enumSym;
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Object.defineProperty(obj, nonenum, { enumerable: false, value: true });
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expect(Object.getOwnPropertySymbols(obj)).to.eql([enumSym, nonenum]);
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return obj;
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};
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it('works with no replacer', function () {
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var obj = createObject();
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expect(JSON.stringify(obj)).to.equal('{"a":1}');
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expect(JSON.stringify(obj, null, '|')).to.equal('{\n|"a": 1\n}');
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});
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it('works with a replacer function', function () {
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var tuples = [];
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var replacer = function (key, value) {
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tuples.push([this, key, value]);
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return value;
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};
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var obj = createObject();
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expect(JSON.stringify(obj, replacer, '|')).to.equal('{\n|"a": 1\n}'); // populate `tuples` array
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expect(tuples).to.eql([
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[{ '': obj }, '', obj],
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[obj, 'a', 1],
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[obj, 'sym', enumSym]
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]);
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});
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it('works with a replacer array', function () {
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var obj = createObject();
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obj.foo = 'bar';
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obj[Symbol.prototype.toString.call(enumSym)] = 'tricksy';
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expect(JSON.stringify(obj, ['a', enumSym])).to.equal('{"a":1}');
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expect(JSON.stringify(obj, ['a', enumSym], '|')).to.equal('{\n|"a": 1\n}');
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});
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it('ignores a non-array non-callable replacer object', function () {
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expect(JSON.stringify('z', { test: null })).to.equal('"z"');
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});
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});
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});
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});
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