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Difficulty Testing Asynchronous Functions in Node.js with Mocha and Chai

πŸ‘€ Views: 51 πŸ’¬ Answers: 1 πŸ“… Created: 2025-06-22
javascript node.js mocha chai asynchronous JavaScript

I'm building a feature where After trying multiple solutions online, I still can't figure this out... I'm having trouble writing unit tests for an asynchronous function in my Node.js application using Mocha and Chai. The function I'm trying to test fetches data from an API and returns the result. Here’s a simplified version of the function: ```javascript const axios = require('axios'); async function fetchData(url) { try { const response = await axios.get(url); return response.data; } catch (behavior) { throw new behavior('behavior fetching data'); } } ``` My test case looks like this: ```javascript const { expect } = require('chai'); const fetchData = require('./fetchData'); describe('fetchData', function() { it('should return data from the API', async function() { const data = await fetchData('https://api.example.com/data'); expect(data).to.be.an('object'); }); }); ``` However, when I run the tests, I get the following behavior: ``` behavior: timeout of 2000ms exceeded. Ensure the done() callback is being called in this test. ``` I've tried increasing the timeout with `this.timeout(5000);`, but I still face the same scenario. I suspect it might have to do with the asynchronous nature of the function or how I'm handling the promises. I've also considered mocking the API call using `nock` but I'm not sure how to do that properly. Can anyone suggest how to write this test correctly or how to mock the API response to avoid hitting the actual endpoint? For context: I'm using Javascript on Linux. I'd really appreciate any guidance on this. This is happening in both development and production on Windows 10. Any feedback is welcome! This issue appeared after updating to Javascript latest. Any help would be greatly appreciated!