es.json.stringify.js

import { DESCRIPTORS, GLOBAL } from '../helpers/constants';

import Symbol from 'core-js-pure/es/symbol';
import stringify from 'core-js-pure/es/json/stringify';

if (GLOBAL.JSON) {
  QUnit.test('Symbols & JSON.stringify', assert => {
    assert.same(stringify([
      1,
      Symbol('foo'),
      false,
      Symbol('bar'),
      {},
    ]), '[1,null,false,null,{}]', 'array value');
    assert.same(stringify({
      symbol: Symbol('symbol'),
    }), '{}', 'object value');
    if (DESCRIPTORS) {
      const object = { bar: 2 };
      object[Symbol('symbol')] = 1;
      assert.same(stringify(object), '{"bar":2}', 'object key');
    }
    assert.same(stringify(Symbol('symbol')), undefined, 'symbol value');
    if (typeof Symbol() == 'symbol') {
      assert.same(stringify(Object(Symbol('symbol'))), '{}', 'boxed symbol');
    }
    assert.same(stringify(undefined, () => 42), '42', 'replacer works with top-level undefined');
  });

  QUnit.test('Well‑formed JSON.stringify', assert => {
    assert.isFunction(stringify);
    assert.arity(stringify, 3);
    assert.name(stringify, 'stringify');

    assert.same(stringify({ foo: 'bar' }), '{"foo":"bar"}', 'basic');
    assert.same(stringify('\uDEAD'), '"\\udead"', 'r1');
    assert.same(stringify('\uDF06\uD834'), '"\\udf06\\ud834"', 'r2');
    assert.same(stringify('\uDF06ab\uD834'), '"\\udf06ab\\ud834"', 'r3');
    assert.same(stringify('𠮷'), '"𠮷"', 'r4');
    assert.same(stringify('\uD834\uDF06'), '"𝌆"', 'r5');
    assert.same(stringify('\uD834\uD834\uDF06'), '"\\ud834𝌆"', 'r6');
    assert.same(stringify('\uD834\uDF06\uDF06'), '"𝌆\\udf06"', 'r7');
    assert.same(stringify({ '𠮷': ['\uDF06\uD834'] }), '{"𠮷":["\\udf06\\ud834"]}', 'r8');
  });
}