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I have some asynchronous (I/O bound) tasks to do, and then I want to use Chai to assert the returned value. Instead of writing a piece of code like this:

expect(await taskA.someAsync()).to.be.eq(something);
expect(await taskB.someAsync()).to.be.eq(something);

I want to wait for all tasks to complete, use await Promise.all([taskA.someAsync(), taskB.someAsync()]), and then expect or ## one by one #assertResult.

I created this function (pseudocode) to make things more general:

type TransactionInfo = {
    txn: Promise<any>; // 要等待的異步任務(wù)
    assertion: Chai.Assertion // 要在txn結(jié)果上運行的斷言
}

const assertAll = async function(...txns: TransactionInfo[]) {
  let values = await Promise.all(allTxns);
  for (let txnInfo of txns) {
    evaluate(txnInfo.assertion)
  }
}

What this function does is

awaitall txns, and then run each assertion on each txn to verify the returned value.

First of all, I'm not sure if the

Chai.Assertion type is correct for assertion. Secondly, I don't know how to instantiate an array of TransactionInfo that contains assertions of different types (like eq or have.lengthOf). Finally, I don't know how to evaluate the assertion object later.

P.S. I am not a professional JavaScript developer. Please be kind :)

import { expect } from 'chai'; type TransactionInfo = { txn: Promise<any>; // 要等待的異步任務(wù) assertion: () => void; // 表示要在txn結(jié)果上運行的斷言函數(shù) }; const assertAll = async function (...txns: TransactionInfo[]) { let values = await Promise.all(txns.map((txnInfo) => txnInfo.txn)); txns.forEach((txnInfo, index) => { txnInfo.assertion(values[index]); }); };

// 示例用法： const txn1: TransactionInfo = { txn: someAsyncTaskA(), assertion: (result) => { expect(result).to.be.eq(something); }, }; const txn2: TransactionInfo = { txn: someAsyncTaskB(), assertion: (result) => { expect(result).to.have.lengthOf(3); }, }; // 使用TransactionInfo對象數(shù)組調(diào)用assertAll函數(shù) await assertAll(txn1, txn2);