2022-07-13
5212
#node
Glad Chinda
239
Jul 13, 2022 ⋅ 18 min read

Testing Node.js with Mocha and Chai

Glad Chinda Full-stack web developer learning new hacks one day at a time. Web technology enthusiast. Hacking stuffs @theflutterwave.

Recent posts:

i tried kiro and here is what i learned

I tried out Kiro: Here’s what I learned

Check out Kiro, AWS’s AI-powered IDE, see what makes it different from other AI coding tools, and explore whether it lives up to the hype.

Elijah Asaolu
Aug 28, 2025 ⋅ 5 min read
Go Design Pattern Article Image With Logo

Why Go design patterns still matter

Here’s how three design patterns solved our Go microservices scaling problems without sacrificing simplicity.

Peter Aideloje
Aug 28, 2025 ⋅ 2 min read
how to protect your ai agent from prompt injection attacks

How to protect your AI agent from prompt injection attacks

Explore six principled design patterns (with real-world examples) to help you protect your LLM agents from prompt injection attacks.

Rosario De Chiara
Aug 27, 2025 ⋅ 5 min read
Don’t Let AI Erase The Next Generation Of Dev Leaders

Don’t let AI erase the next generation of dev leaders

As AI tools take over more routine coding work, some companies are cutting early-career dev roles — a short-sighted move that could quietly erode the next generation of tech leaders if we aren’t careful.

Jack Herrington
Aug 26, 2025 ⋅ 6 min read
View all posts

12 Replies to "Testing Node.js with Mocha and Chai"

  1. Thanks for a very useful article!

    One super-small nit – on the md5 tests, the error message returned in the thrown exception changed (probably in the node version I am running, 12.18.0) from ‘Data must be a string or a buffer’ to ‘The “data” argument must be of type string or an instance of Buffer, TypedArray, or DataView’.

    Super simple to fix, and actually a nice introduction to what an assertion failure message looks like :-).

    1. Yes, really wonderful article! On the endless run to catch the actual message, currently it returns: “The \”data\” argument must be one of type string, Buffer, TypedArray, or DataView. Received type number”

  2. I really appreciated your article! It’s helped a ton with some testing I’ve been doing for a project I’m working on.

    Apologies if this is a naive question. I’m relatively new to Typescript and Mocha testing. I have the following question posted on StackOverflow about how to test process.on() using mocha testing, so that I may increase code coverage:

    https://stackoverflow.com/questions/63062843/how-to-test-process-on-using-mocha

    Any advice would be greatly appreciated!

  3. describe(‘webpack’, function () {
    ^

    TypeError: describe is not a function
    at Object. (/Users/sathish-1320/Sathish/Office/assist_web/jsapps/packages/i18n/toJsonCovert/test/test.js:20:1)
    at Module._compile (internal/modules/cjs/loader.js:956:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
    at Module.load (internal/modules/cjs/loader.js:812:32)
    at Function.Module._load (internal/modules/cjs/loader.js:724:14)
    at Function.Module.runMain (internal/modules/cjs/loader.js:1025:10)
    at internal/main/run_main_module.js:17:11

Leave a Reply