Problems with Stock Price Checker

Problems with Stock Price Checker
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HI! I’m building a Stock Price Checker project on glitch now, and when I got to the testing part I ran into a strange problem. Now, the project itself seems to work fine when I test it manually or on But functional test won’t pass (even though I’m sure the tests themselves are correct).
Here’s the problem: I have my handler function in a separate module, it gets called with req.query.stock as an argument. Here’s parts of my code with console.logs in it:
api.js .get(function (req, res){ console.log(req.query.stock, 'api'); \\a callback function if (Array.isArray(req.query.stock)){ stockHandler(req.ip, processing, req.query.stock[0],; } else { stockHandler(req.ip, processing, req.query.stock,; }

module.exports = function(ip, callback, ticker, like)  {
  IP.findOne({address: ip}, function(err, found){
        if (err) return;
    console.log(ticker, 'findone');
        request({url: '' + ticker,
              json: true}, 
              function (error, response, body){     
      console.log(ticker, body);
       if (error) return;   
       var json = JSON.parse(body.slice(4, body.length));

Now, I get an error because the first time Mocha runs my tests the ticker inside IP.findOne is undefined, and therefore the request to server comes back with response code 400 instead of data. This is what console logs ( ticker === ‘goog’, the second word is the marker of where console.log line is in the code):
goog api
undefined 'findone’
goog findone
undefined ‘ Response Code 400\n’
(Also sometimes undefined findone is before goog api.
But if I run my program manually, everything is fine:
goog api
goog findone
goog //response body

So, my question is - where does this undefined comes from? Why does it only occur with automated tests? And how do I get rid of it? Full code of my project is here:!/comfortable-mimosa
I’d appreciate any help!