/**
 * 摘要池的容量与生命周期测试。活动执行数和 FIFO 等待数分别受限；调用者取消不等于底层执行器已经退出。
 * 以固定格式摘要和手动完成的执行器隔离哈希算法，专门验证调度、关闭及输出校验。
 */
import {test} from 'node:test';
import assert from 'node:assert/strict';
import {createDigestPool} from '../../src/lib/canvas-runtime/digest-pool.ts';
// hash 仅作合法输出样本；tick 让执行器的微任务/定时器推进，便于检查当前实际启动次序。
const hash='a'.repeat(64),tick=()=>new Promise(resolve=>setTimeout(resolve,0));
// 两个执行槽加两个排队名额：第五个拒绝容量，取消排队的 C 后仅 A/B 启动，A 完成才按 FIFO 启动 D；关闭后拒绝新任务。
test('digest pool bounds execution and FIFO queue, rejects overload and drops queued cancellation',async()=>{
 const started=[],release=[];const pool=createDigestPool({concurrency:2,maxQueued:2,execute:async bytes=>{started.push(await bytes.text());return new Promise(resolve=>release.push(()=>resolve(hash)));}}),cancel=new AbortController(),a=pool.digest(new Blob(['A'])),b=pool.digest(new Blob(['B'])),c=pool.digest(new Blob(['C']),cancel.signal),d=pool.digest(new Blob(['D']));const rejected=assert.rejects(c,/import_aborted/);await assert.rejects(pool.digest(new Blob(['overflow'])),/digest_capacity/);cancel.abort();await rejected;await tick();assert.deepEqual(started,['A','B']);release[0]();await a;await tick();assert.deepEqual(started,['A','B','D']);release[1]();release[2]();await Promise.all([b,d]);pool.close();await assert.rejects(pool.digest(new Blob()),/digest_pool_closed/);
});
// 取消活动 first 后先拒绝调用者，但底层仍挂起时 second 不能启动；first 真正退出后才复用槽位，并忽略其迟到输出。
// execute 故意不监听 AbortSignal，模拟不可立即停止的计算；release 控制真实退出时刻，而非调用者 Promise 拒绝时刻。
test('active cancellation cannot free a compute slot before its executor stops; late output is ignored',async()=>{
 let release;const started=[],controller=new AbortController(),pool=createDigestPool({concurrency:1,execute:async bytes=>{started.push(await bytes.text());if(started.length===1)await new Promise(resolve=>release=resolve);return hash;}}),first=pool.digest(new Blob(['first']),controller.signal),rejected=assert.rejects(first,/import_aborted/),second=pool.digest(new Blob(['second']));await tick();controller.abort();await rejected;await tick();assert.deepEqual(started,['first']);release();assert.equal(await second,hash);pool.close();
});
// close 幂等地取消活动/排队调用并向实际执行器传递 abort；新池中格式错误的 execute 输出必须拒绝。
test('closing digest pool aborts active/queued tasks once and malformed executor output is rejected',async()=>{
 const signals=[],pool=createDigestPool({concurrency:1,execute:(_bytes,signal)=>{signals.push(signal);return new Promise((_,reject)=>signal.addEventListener('abort',()=>reject(Error('stopped')),{once:true}));}}),a=pool.digest(new Blob()),b=pool.digest(new Blob()),failures=[assert.rejects(a,/import_aborted/),assert.rejects(b,/import_aborted/)];await tick();pool.close();pool.close();await Promise.all(failures);assert.equal(signals.length,1);assert.equal(signals[0].aborted,true);const invalid=createDigestPool({execute:async()=> 'bad'});await assert.rejects(invalid.digest(new Blob()),/invalid_digest_response/);invalid.close();
});