Unit tests
A unit test is a piece of code written and executed by software developers to ensure that a section of an application (known as a "unit") meets its design and behaves as intended.
A unit can be almost anything you want it to be, from just line of code, a method, or a class. However in general, smaller is better since smaller tests give you a much more granular view of how your code is performing.
The goal of unit testing is to isolate each part of the program and show that the individual parts are correct, as a result it provides two main advantages:
- Finds problems early in the development cycle
- Allows the programmer to refactor code or make upgrades and make sure the module still works correctly
- Learn more
- Wikipedia
- Related tags
- Refactoring
Related articles
JS monorepos in prod 7: Continuous Integration and Continuous Deployment with GitHub Actions
Categories: DevOps & SRE, Front End | Tags: CI/CD, Monorepo, Node.js, Unit tests
The value of CI/CD lies in the ability to control and coordinate changes and feature addition in multiple, iterative releases while simultaneously having multiple services being actively developed in…
Apr 6, 2022
JS monorepos in prod 6: CI/CD, continuous integration and deployment with Travis CI
Categories: DevOps & SRE, Front End | Tags: CI/CD, Monorepo, Node.js, Unit tests
Implementing continuous integration CI and continuous deployment (CD) on a monorepo is quite complex due to the diversity of multiple responsibilities between developers and the need to coordinate…
By David WORMS
Dec 6, 2021
Running your Travis CI builds locally with Docker
Categories: DevOps & SRE, Front End | Tags: Bash, Tools, CI/CD, Node.js, Unit tests
Setting up the environment to run the tests on a CI/CD can take a few roundtrips between your host machine and the CI/CD running remotely. For every attempt, you’ll have to commit and publish your…
By David WORMS
Sep 6, 2021
Modern Python part 3: run a CI pipeline & publish your package to PiPy
Categories: DevOps & SRE | Tags: GitHub, CI/CD, Git, Python, Release and features, Unit tests
To propose a well-maintained and usable Python package to the open-source community or even inside your company, you are expected to accomplish a set of critical steps. First ensure that your code is…
By Faouzi BRAZA
Jun 28, 2021
Modern Python part 2: write unit tests & enforce Git commit conventions
Categories: DevOps & SRE | Tags: Git, pandas, Python, Unit tests
Good software engineering practices always bring a lot of long-term benefits. For example, writing unit tests permits you to maintain large codebases and ensures that a specific piece of your code…
By Faouzi BRAZA
Jun 24, 2021
Modern Python part 1: start a project with pyenv & poetry
Categories: DevOps & SRE | Tags: Git, Python, Release and features, Unit tests
When learning a programming language, the focus is essentially on understanding the syntax, the code style, and the underlying concepts. With time, you become sufficiently comfortable with the…
By Faouzi BRAZA
Jun 9, 2021
JS monorepos in prod 4: unit testing with Mocha and Should.js
Categories: DevOps & SRE, Front End | Tags: Automation, CI/CD, Git, GitOps, Monorepo, Node.js, Unit tests
Unit testing is essential for every long-term project and allows you to pull down functionalities of your code into isolated testable units. Indeed the main goal of a unit test is to verify if an…
By David WORMS
Feb 25, 2021
JS monorepos in prod 3: commit enforcement and changelog generation
Categories: DevOps & SRE, Front End | Tags: CI/CD, Git, JavaScript, Monorepo, Node.js, Release and features, Unit tests
Conventional Commits introduces a structured format for commit messages. It standardizes the messages among all the contributors. This makes them more readable and easy to automate. It simplifies the…
By David WORMS
Feb 2, 2021
JS monorepos in prod 2: project versioning and publishing
Categories: DevOps & SRE, Front End | Tags: CI/CD, Git, GitOps, JavaScript, Monorepo, Node.js, Release and features, Unit tests
One great advantage of a monorepo is to maintain coherent versions between packages and to automatize the version creation and the publication of packages. This article covers the versioning and…
By David WORMS
Jan 11, 2021
Build your open source Big Data distribution with Hadoop, HBase, Spark, Hive & Zeppelin
Categories: Big Data, Infrastructure | Tags: Maven, Hadoop, HBase, Hive, Spark, Git, Release and features, TDP, Unit tests
The Hadoop ecosystem gave birth to many popular projects including HBase, Spark and Hive. While technologies like Kubernetes and S3 compatible object storages are growing in popularity, HDFS and YARN…
Dec 18, 2020
Rebuilding HDP Hive: patch, test and build
Categories: Big Data, Infrastructure | Tags: Maven, GitHub, Java, Hive, Git, Release and features, TDP, Unit tests
The Hortonworks HDP distribution will soon be deprecated in favor of Cloudera’s CDP. One of our clients wanted a new Apache Hive feature backported into HDP 2.6.0. We thought it was a good opportunity…
Oct 6, 2020
Installing Hadoop from source: build, patch and run
Categories: Big Data, Infrastructure | Tags: Maven, Java, LXD, Hadoop, HDFS, Docker, TDP, Unit tests
Commercial Apache Hadoop distributions have come and gone. The two leaders, Cloudera and Hortonworks, have merged: HDP is no more and CDH is now CDP. MapR has been acquired by HP and IBM BigInsights…
Aug 4, 2020
Automate a Spark routine workflow from GitLab to GCP
Categories: Big Data, Cloud Computing, Containers Orchestration | Tags: Learning and tutorial, Airflow, Spark, CI/CD, GitLab, GitOps, GCP, Terraform
A workflow consists in automating a succession of tasks to be carried out without human intervention. It is an important and widespread concept which particularly apply to operational environments…
Jun 16, 2020
Spark Streaming part 3: DevOps, tools and tests for Spark applications
Categories: Big Data, Data Engineering, DevOps & SRE | Tags: Apache Spark Streaming, DevOps, Learning and tutorial, Spark
Whenever services are unavailable, businesses experience large financial losses. Spark Streaming applications can break, like any other software application. A streaming application operates on data…
May 31, 2019
Tutorial for creating and publishing a new Node.js module
Categories: Front End | Tags: GitHub, Learning and tutorial, License, Mocha, NPM, Travis CI, CoffeeScript, JavaScript, Node.js, Unit tests
In this tutorial, I provide complete instructions for creating a new Node.js module, writing the code in coffee-script, publishing it on GitHub, sharing it with other Node.js fellows through NPM…
By David WORMS
Dec 3, 2013
Crawl you website including login form with Phantomjs
Categories: Front End | Tags: Mocha, CoffeeScript, JavaScript, Node.js, Unit tests
With PhantomJS, we start a headless WebKit and pilot it with our own scripts. Said differently, we write a script in JavaScript or CoffeeScript which controls an Internet browser and manipulates the…
By David WORMS
Nov 27, 2013
Catch 'uncaughtException' error in your mocha test
Categories: Node.js | Tags: DevOps, Mocha, JavaScript, Unit tests
This isn’t the first time I faced this situation. Today, I finally found the time and energy to look for a solution. In your mocha test, let’s say you need to test an expected “uncaughtException…
By David WORMS
Oct 27, 2013
A fresh look at testing Node.js projects: Mocha, Should and Travis
Categories: DevOps & SRE, Node.js | Tags: DevOps, Mocha, CI/CD, JavaScript, Node.js, Unit tests
Today, I finally decided to spend some time around Travis. It’s been a few weeks since that little green image on top of many GitHub homepages has been buzzing me. Well, to be totally honest, this isn…
By David WORMS
Feb 19, 2012
