mudb/src/util/test/stringify.ts

Real-time database for multiplayer games

import * as test from 'tape';
import { stableStringify } from '../stringify';

test('toJSON()', (t) => {
    const now = new Date();
    t.equal(stableStringify(now),       `"${now.toJSON()}"`);
    t.equal(stableStringify({d: now}),  `{"d":"${now.toJSON()}"}`);
    t.end();
});

test('undefined & null', (t) => {
    t.equal(stableStringify({a: 0, b: undefined, c: 1}),    '{"a":0,"c":1}');
    t.equal(stableStringify({a: 0, b: null, c: 1}),         '{"a":0,"b":null,"c":1}');
    t.equal(stableStringify([0, undefined, 1]),             '[0,null,1]');
    t.equal(stableStringify([0, null, 1]),                  '[0,null,1]');
    t.end();
});

test('NaN & Infinity', (t) => {
    t.equal(stableStringify({a: 0, b: NaN, c: 1}),      '{"a":0,"b":null,"c":1}');
    t.equal(stableStringify({a: 0, b: Infinity, c: 1}), '{"a":0,"b":null,"c":1}');
    t.equal(stableStringify([0, NaN, 1]),               '[0,null,1]');
    t.equal(stableStringify([0, Infinity, 1]),          '[0,null,1]');
    t.end();
});

test('sorting', (t) => {
    t.equal(stableStringify({}), '{}');
    t.equal(stableStringify([]), '[]');
    const flat = {b: false, ascii: '<a href="https://github.com/mikolalysenko/mudb/">mudb</a>', u: 'Iñtërnâtiônàlizætiøn☃💩', f32: 0.5, n: null};
    t.equal(stableStringify(flat), `{"ascii":${JSON.stringify('<a href="https://github.com/mikolalysenko/mudb/">mudb</a>')},"b":false,"f32":0.5,"n":null,"u":"Iñtërnâtiônàlizætiøn☃💩"}`);
    const nested = {e: {}, a: [], o: {z: {b: {a: 0, c: 0, b: 0}, a: 0, c: 0}, a: [{z: 0, a: [{c: 0, b: 0, a: 0}]}]}, f64: -1.5e308, b: true};
    t.equal(stableStringify(nested), '{"a":[],"b":true,"e":{},"f64":-1.5e+308,"o":{"a":[{"a":[{"a":0,"b":0,"c":0}],"z":0}],"z":{"a":0,"b":{"a":0,"b":0,"c":0},"c":0}}}');
    t.end();
});

test('circular references', (t) => {
    const o = {a: 0, z: 1};
    o['o'] = o;
    t.throws(() => stableStringify(o), TypeError, 'Converting circular structure to JSON');
    t.end();
});

test('repeated references', (t) => {
    const o = {a: 0};
    const p = {b: o, c: o};
    t.equal(stableStringify(p), '{"b":{"a":0},"c":{"a":0}}');
    t.end();
});