Adding Jest To Explainer.js

This page summarizes the projects mentioned and recommended in the original post on dev.to

InfluxDB – Built for High-Performance Time Series Workloads
InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com
featured
SaaSHub - Software Alternatives and Reviews
SaaSHub helps you find the best software and product alternatives
www.saashub.com
featured
  1. jest

    Delightful JavaScript Testing.

    Main problem I faced was I used ESM instead of CommonJS. Which made my life much harder. First issue was jest.mock not working. After some research I realized the way to mock is different in ESM. Unfortunately even after following the docs I could not get it to work. So, I had to do jest.spyOn. Second issue I faced was since execa runs in child_process the index.test.js although runs it does not effect the coverage report. So I had to use jest.spyOn to rewrite the test. I also had to refactor index.js so that it does not take the flags I'm passing to jest. Other smaller issue I faced was, using node --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js -c jest.config.mjs instead of jest -c jest.config.mjs cause I was using ESM. I also had to use mock-fs to replicate file system to test FilepathResolver.test.js because simple jest.spyOn did not test it thoroughly enough. I was surprised how many roadblocks were cause by just using ESM and it just reflects what a mess JS is.

  2. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo
  3. rspec-rails

    RSpec for Rails 7+

    I'm a huge supporter for TDD(Test Driven Development). Almost every piece code should be tested. During my co-op more than half of the time I spent writing test for my PR. I believe that experience really helped me understand the necessity of testing. I was surprised to see how similar the testing framework in JS and Ruby are. I used Jest which is very similar to RSpec I have used during my co-op. To mock http resquest I used Nock kinda similar to something called VCR.

  4. Nock

    HTTP server mocking and expectations library for Node.js

    I'm a huge supporter for TDD(Test Driven Development). Almost every piece code should be tested. During my co-op more than half of the time I spent writing test for my PR. I believe that experience really helped me understand the necessity of testing. I was surprised to see how similar the testing framework in JS and Ruby are. I used Jest which is very similar to RSpec I have used during my co-op. To mock http resquest I used Nock kinda similar to something called VCR.

  5. vcr

    Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

    I'm a huge supporter for TDD(Test Driven Development). Almost every piece code should be tested. During my co-op more than half of the time I spent writing test for my PR. I believe that experience really helped me understand the necessity of testing. I was surprised to see how similar the testing framework in JS and Ruby are. I used Jest which is very similar to RSpec I have used during my co-op. To mock http resquest I used Nock kinda similar to something called VCR.

  6. execa

    Process execution for humans

    Main problem I faced was I used ESM instead of CommonJS. Which made my life much harder. First issue was jest.mock not working. After some research I realized the way to mock is different in ESM. Unfortunately even after following the docs I could not get it to work. So, I had to do jest.spyOn. Second issue I faced was since execa runs in child_process the index.test.js although runs it does not effect the coverage report. So I had to use jest.spyOn to rewrite the test. I also had to refactor index.js so that it does not take the flags I'm passing to jest. Other smaller issue I faced was, using node --experimental-vm-modules --no-warnings node_modules/jest/bin/jest.js -c jest.config.mjs instead of jest -c jest.config.mjs cause I was using ESM. I also had to use mock-fs to replicate file system to test FilepathResolver.test.js because simple jest.spyOn did not test it thoroughly enough. I was surprised how many roadblocks were cause by just using ESM and it just reflects what a mess JS is.

  7. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
NOTE: The number of mentions on this list indicates mentions on common posts plus user suggested alternatives. Hence, a higher number means a more popular project.

Suggest a related project

Related posts

  • How To Convert HTML CSS JS To React JS

    4 projects | dev.to | 26 Mar 2025
  • Learning from My Own Tests

    4 projects | dev.to | 11 Nov 2024
  • Build a Real-time Notification System with Socket.IO and ReactJS

    7 projects | dev.to | 2 Oct 2024
  • Automated visual regression testing with TypeScript, Puppeteer, Jest and Jest Image Snapshot

    4 projects | dev.to | 16 Apr 2021
  • JavaScript package manager - How to fix Cannot find module 'cheerio' error with Enzyme in Yarn 1 projects

    5 projects | dev.to | 11 Jun 2025