// Appendix A test vectors — the spec (docs/spec/index.html) and the engine

// must agree byte-for-byte. If this file fails, either the code or the spec

// changed; update BOTH deliberately or revert.

import { describe, it } from 'node:test';

import assert from 'node:assert';

import { canonicalize, entryHash, pairKey, toMicro } from '../lib/engine.js';

const A = 'https://n.example/u/alice#me';

const B = 'https://n.example/u/bob#me';

const C = 'https://n.example/u/carol#me';

describe('spec Appendix A vectors', () => {

it('A.1 canonicalization', () => {

assert.strictEqual(canonicalize({ b: 1, a: 'x', 'é': true }), '{"a":"x","b":1,"é":true}');

});

it('A.2 balance key and micro-units', () => {

assert.strictEqual(pairKey(B, A, 'USD'),

'https://n.example/u/alice#me|https://n.example/u/bob#me|USD');

assert.strictEqual(toMicro(300), 300000000n);

assert.strictEqual(toMicro(0.000001), 1n);

assert.strictEqual(toMicro(0.0000001), null);

});

it('A.3 three-entry chain hashes', () => {

const e1 = {

seq: 1, prev: null, ts: '2026-07-29T12:00:00.000Z', actor: B,

type: 'create-trustline', params: { peer: A, currency: 'USD', limit: 1000 },

};

const h1 = entryHash(e1);

assert.strictEqual(h1, 'sha256:27ae26a0a5abe78b3dca9cba1fdb73bd5df6652f32e5d7dc8396e06a0e84ec86');

const e2 = {

seq: 2, prev: h1, ts: '2026-07-29T12:01:00.000Z', actor: C,

type: 'create-trustline', params: { peer: B, currency: 'USD', limit: 500 },

};

const h2 = entryHash(e2);

assert.strictEqual(h2, 'sha256:151bb238b8aa204bda446bc6574fd237bbac398c82a4335683a8749bdb408ef5');

const e3 = {

seq: 3, prev: h2, ts: '2026-07-29T12:02:00.000Z', actor: A,

type: 'send-payment',

params: { from: A, to: C, currency: 'USD', amount: 300, path: [A, B, C] },

};

assert.strictEqual(entryHash(e3),

'sha256:cf5289f9be4010c23ce11838819dab7fa287259d94530183aa77bd1de23786c4');

// The exact hashed bytes of entry 3, as printed in the appendix.

assert.strictEqual(canonicalize(e3),

'{"actor":"https://n.example/u/alice#me","params":{"amount":300,"currency":"USD",'

+ '"from":"https://n.example/u/alice#me","path":["https://n.example/u/alice#me",'

+ '"https://n.example/u/bob#me","https://n.example/u/carol#me"],'

+ '"to":"https://n.example/u/carol#me"},'

+ '"prev":"sha256:151bb238b8aa204bda446bc6574fd237bbac398c82a4335683a8749bdb408ef5",'

+ '"seq":3,"ts":"2026-07-29T12:02:00.000Z","type":"send-payment"}');

});

});