如何修复黄瓜 NodeJS 中未决的承诺

Question

我正在编写黄瓜测试，并期待来自此函数 getOutout 的值 true 并使用返回值执行断言，但我收到以下错误：

错误信息：

AssertionError [ERR_ASSERTION]: undefined == true
    at processTicksAndRejections (node:internal/process/task_queues:96:5) {
  generatedMessage: true,
  code: 'ERR_ASSERTION',
  actual: undefined,
  expected: true,
  operator: '==',
  [Symbol(originalCallSite)]: [ CallSite {}, CallSite {} ],
  [Symbol(mutatedCallSite)]: [ CallSite {}, CallSite {} ]

step.js

const { Given, When, Then } = require('@cucumber/cucumber');
const AWS = require('aws-sdk');
const assert = require('assert');


let isSuccess;
Then('validate the {string} product', function (productType) {

  var params = {
    stateMachineArn: 'arn:aws:states:us-west-1:121:stateMachine:test',
    maxResults: '25',
    nextToken: null,
    statusFilter: 'SUCCEEDED'
  };

  const result = getOutout(params).then(function() {
     assert.equal(result, true);
    })
  
});


async function getOutout(params) {

  const stepfunctions = new AWS.StepFunctions({
    region: process.env.AWS_REGION
  });

  try {
    isSuccess = await listExecute(params, stepfunctions);
    console.log(isSuccess, 'Output') 
    
  } catch (e) {
    console.log(e)
  }
}

const listExecute = function (params, stepfunctions) {
  return new Promise((resolve, reject) => {
    stepfunctions.listExecutions(params, function (err, data) {
      if (err) reject(err);
      else
        data.executions.forEach(function (result) {
          let params = {
            executionArn: result.executionArn
          };
          stepfunctions.describeExecution(params, function (err, data) {
            if (err) reject(err);
            else {
              resolve(true)
            }
          });

        });
    });
  })
}

任何帮助将不胜感激解决这个问题。提前致谢！

Answer 1

不知道你为什么这样做，但这是糟糕的异步代码

const result = getOutout(params).then(function() {
  })
assert.equal(result, true);

您需要将断言放在承诺回调中：

getOutout(params).then(function(result) {
  assert.equal(result, true);
})