Verify email content using mocha - node.js

Question

I am using Node JS, mocha and googleapi writing tests to verify email content
When i run the googleapi as a standalone node js file i am able to get mails but when i integrate it with mocha tests i am not seeing any result, please help
test spec file (verify.js)
var checkEmail = require('../shared/checkEmail');
const { google } = require('googleapis');
var expect = require('chai').expect;
var chai = require('chai');
var chaiAsPromised = require('chai-as-promised');
const { isNullOrUndefined } = require('util');
chai.use(chaiAsPromised);
chai.should();
var emailRecords = new Array();
var content;
var auth;
describe('GMAIL Testing', function () {
before('Connect to Gmail server', function () {
content = checkEmail.getAuthentication();
auth = checkEmail.authorize(content);
// Random test data
var a = [{ "Id": "123", "MsgId": "34677", "Type": "aaa", "Subject": "subxxxx", "ToAddress": "abc#gmail.com", "ToName": "ABC", "DateCreated": "2020-07-09T18:25:38.047Z" }];
emailRecords.push(a);
var b = [{ "Id": "456", "MsgId": "34655", "Type": "bbb", "Subject": "subject", "ToAddress": "abc#gmail.com", "ToName": "ABC", "DateCreated": "2020-06-09T18:25:38.047Z" }];
emailRecords.push(b);
});
it('Gmail Verification', function () {
emailRecords.forEach(element => {
const gmail = google.gmail({ version: 'v1', auth });
var query = "from:noreply#somedomain.com " + element[0].MsgId;
console.log('getting mail '+ element[0].MsgId);
gmail.users.messages.list({
userId: 'me',
q: query
}, (err, res) => {
if (err) return console.log('The API returned an error: ' + err);
var mails = res.data.messages;
console.log('mail(s) found');
expect(mails.length).to.be.at.least(1);
});
console.log('completed search');
});
});
});
Utility File checkEmail.js Ref -> Gmail API
const fs = require('fs');
const readline = require('readline');
const { google } = require('googleapis');
var base64 = require('js-base64').Base64;
const cheerio = require('cheerio');
var open = require('open');
const { isNullOrUndefined } = require('util');
var Mailparser = require('mailparser').MailParser;
const SCOPES = ['https://www.googleapis.com/auth/gmail.readonly'];
// The file token.json stores the user's access and refresh tokens, and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = 'token.json';
module.exports = new class checkEmail {
getAuthentication() {
// Load client secrets from a local file.
console.log('getting auth');
this.content = JSON.parse(fs.readFileSync('shared/config/credentials.json', 'utf8'));
return this.content;
}
authorize(credentials) {
const { client_secret, client_id, redirect_uris } = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(
client_id, client_secret, redirect_uris[0]);
var token = fs.readFileSync(TOKEN_PATH, 'utf-8');
if (token == isNullOrUndefined) {
token = getNewToken(oAuth2Client);
}
oAuth2Client.setCredentials(JSON.parse(token));
return oAuth2Client;
}
getNewToken(oAuth2Client) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: 'offline',
scope: SCOPES,
});
var newToken;
console.log('Authorize this app by visiting this url:', authUrl);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.question('Enter the code from that page here: ', (code) => {
rl.close();
oAuth2Client.getToken(code, (err, token) => {
if (err) return console.error('Error retrieving access token', err);
oAuth2Client.setCredentials(token);
// Store the token to disk for later program executions
fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
if (err) return console.error(err);
console.log('Token stored to', TOKEN_PATH);
});
newToken = token;
});
});
return newToken;
}
}
I have tried adding debug messages but nothing is printed nor any error is thrown, Please let me know if i am missing something
output after running tests
> .\node_modules.bin\mocha .\test\verify.js
Tests are appearing to be passed but console.log('mail(s) found');
didnt show up in the output

Answer 1

Your test is finishing before your network request finishes.
See this section in the mocha docs.
https://mochajs.org/#asynchronous-code
You need to either use the done callback or return a promise.
If you can use async/await I find this to be the easiest because an async function always returns a promise: https://mochajs.org/#using-async-await