20 lines
1.7 KiB
JavaScript
20 lines
1.7 KiB
JavaScript
/**
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* JSON隔离函数的语义与所有权测试。以日期、toJSON、稀疏数组、特殊键及循环等输入核对JSON转换与深冻结。
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* 所有权证明只认可函数自己产生的结果，不能因调用方freeze或clone就复用内部证明。
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*/
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import {test} from 'node:test';
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import assert from 'node:assert/strict';
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import {detachJsonData,hasDetachedJsonData} from '../../src/lib/canvas-core/json-data.ts';
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// 修改外部嵌套对象/日期不得影响结果；数组空洞等变null，特殊键保留，伪造冻结副本无证明，循环/BigInt明确抛错。
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test('JSON detachment owns only its copied immutable result and preserves JSON semantics',()=>{
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let calls=0;const external={nested:{text:'before'},date:new Date('2026-01-01Z'),custom:{toJSON(){calls++;return{value:2};}},array:[,undefined,NaN],['__proto__']:{safe:true}};
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const value=detachJsonData(external);assert.equal(calls,1);assert.equal(hasDetachedJsonData(value),true);assert.equal(hasDetachedJsonData(external),false);
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external.nested.text='after';external.date.setUTCFullYear(2027);
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assert.equal(value.nested.text,'before');assert.equal(value.date,'2026-01-01T00:00:00.000Z');assert.deepEqual(value.array,[null,null,null]);assert.equal(Object.hasOwn(value,'__proto__'),true);
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assert.ok(Object.isFrozen(value.nested));assert.throws(()=>{value.nested.text='mutate';},TypeError);
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assert.equal(hasDetachedJsonData(Object.freeze({...value})),false);assert.equal(hasDetachedJsonData(structuredClone(value)),false);
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assert.equal(hasDetachedJsonData(Object.freeze({nested:{mutable:true}})),false);
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const cycle={};cycle.self=cycle;assert.throws(()=>detachJsonData(cycle));assert.throws(()=>detachJsonData({big:1n}));
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});
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