2022-12-22
2600
#node
Godwin Ekuma
9184
Dec 22, 2022 â‹… 9 min read

Node.js unit testing using Mocha, Chai, and Sinon

Godwin Ekuma I learn so that I can solve problems.

Recent posts:

javascript is null or empty function

How to check for null, undefined, or empty values in JavaScript

In most languages, we only have to cater to null. But in JavaScript, we have to cater to both null and undefined. How do we do that?

Lewis Cianci
Feb 14, 2025 â‹… 4 min read
MERN Stack: Overview With Examples

What is the MERN stack? Overview with examples

Discover how the MERN stack (MongoDB, Express.js, React, Node.js) enables developers to build dynamic, performant, modern websites and apps.

Nefe Emadamerho-Atori
Feb 13, 2025 â‹… 20 min read
Leveraging Parallel Computing In Node.js

Leveraging parallel computing in Node.js

Use parallel computing in Node.js with worker threads to optimize performance, handle CPU-intensive tasks, and utilize multi-core processors.

David Omotayo
Feb 13, 2025 â‹… 8 min read

A guide to modern frontend architecture patterns

Frontend architecture is the foundation of your frontend codebase. Here’s how to optimize the pattern that you choose.

Shalitha Suranga
Feb 12, 2025 â‹… 9 min read
View all posts

10 Replies to "Node.js unit testing using Mocha, Chai, and Sinon"

  1. Should the user repository take UserModel as an argument in the constructor? I’m wondering how the test suite for UserRepository knows anything about the stubbed model if the stubbed model is not passed in to the constructor.

  2. The Model exists in the global scope of the user repository, this allows the repository class have access to it. So in the test if the UserModel is referenced the stub will passed instead of the actual model.

  3. Hi thanks for sharing!. I have a question if i wanna return response with 500 status code if repository can not save user to database i.e database connection is broken or like that.

  4. I getting this error, please help me to solve this!!!

    …\node_modules\yargs\yargs.js:1172
    else throw err
    ^

    Error: Cannot find module ‘../database’
    Require stack:
    – E:\Intenships\vivasvant systems llp\Web development\src\js\mocks\user.repository.test.js
    – E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\mocha.js
    – E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\one-and-dones.js
    – E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\options.js
    – E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\bin\mocha
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:610:15)
    at Function.Module._load (internal/modules/cjs/loader.js:526:27)
    at Module.require (internal/modules/cjs/loader.js:666:19)
    at require (internal/modules/cjs/helpers.js:16:16)
    at Object. (E:\Intenships\vivasvant systems llp\Web development\src\js\mocks\user.repository.test.js:5:23)
    at Module._compile (internal/modules/cjs/loader.js:759:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
    at Module.load (internal/modules/cjs/loader.js:628:32)
    at Function.Module._load (internal/modules/cjs/loader.js:555:12)
    at Module.require (internal/modules/cjs/loader.js:666:19)
    at require (internal/modules/cjs/helpers.js:16:16)
    at E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\mocha.js:334:36
    at Array.forEach ()
    at Mocha.loadFiles (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\mocha.js:331:14)
    at Mocha.run (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\mocha.js:809:10)
    at Object.exports.singleRun (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\run-helpers.js:108:16)
    at exports.runMocha (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\run-helpers.js:142:13)
    at Object.exports.handler (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\run.js:292:3)
    at Object.runCommand (E:\Intenships\vivasvant systems llp\Web development\node_modules\yargs\lib\command.js:242:26)
    at Object.parseArgs [as _parseArgs] (E:\Intenships\vivasvant systems llp\Web development\node_modules\yargs\yargs.js:1096:28)
    at Object.parse (E:\Intenships\vivasvant systems llp\Web development\node_modules\yargs\yargs.js:575:25)
    at Object.exports.main (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\lib\cli\cli.js:68:6)
    at Object. (E:\Intenships\vivasvant systems llp\Web development\node_modules\mocha\bin\mocha:162:29)
    at Module._compile (internal/modules/cjs/loader.js:759:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:770:10)
    at Module.load (internal/modules/cjs/loader.js:628:32)
    at Function.Module._load (internal/modules/cjs/loader.js:555:12)
    at Function.Module.runMain (internal/modules/cjs/loader.js:826:10)
    at internal/main/run_main_module.js:17:11
    npm ERR! Test failed. See above for more details.

  5. Hi there,
    thanks a lot for the excellent post.

    Just an update: faker is no longer available and has become a community project: npm install @faker-js/faker

  6. any mocking methods that don’t use chai ? Chai doesn’t support ES modules. Unit testing is a royal pain in the butt for node.js when needed a mocked database (WAY too complicated for something that should be simple). Just use a real database and be done with it (a staging database)

Leave a Reply