Glad Chinda
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.

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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:


    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

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