Unit Testing for Typescript & NodeJs Developers with Jest from Udemy

A must have skill for senior developers

Typescript is getting more and more popularity and it is a required skill for many IT jobs. It's key feature is type safety, thus preventing bugs.

But yes another skill is very important for any programming job: unit testing. Combining these two techniques will result in solid, robust and bug free code.

This course will go beyond the basics of unit testing and teach you all you need to write real world, complex testing suites for NodeJs and Typescript applications using the most popular JavaScript testing library: Jest.

Using Jest as an unit testing library provides many advantages:

Unitary unit testing library for running and structuring tests
Extensive mocking, stubbing and spying capabilities
Powerful matchers to create simple to read tests
Jest ships as one unitary NPM package
Jest is the default choice for TypeScript React projects

Why unit testing NodeJs apps?

Unit testing usually adds a lot to a code base, two or tree times in some cases. This also means that a lot of time needs to be invested in writing and setting up tests. But all this effort pays of: time, effort and headache of fixing bugs can be used for more fun activities.

What you will get from this course:

setup NodeJs and Typescript projects from scratch
implement unit testing with Jest
learn about unit testing configuration with parameters like: roots, transform, testRegex or verbose
learn about Jest test suites structure: describe with value, test, descriptions, hooks like beforeEach
basic and advanced assertions, comparing primitive types, objects or even errors
instantiating test double objects like mocks, stubs, spies or fakes.
write complex mock objects which can be used with "strange" JavaScript libraries.
inject doubles: directly inside the constructor, over the module or even using the objects prototype
learn about deep mocks and matchers to make your tests even better
integration tests for a NodeJs server application
Conditionally and asynchronously skip tests

Dedicated sections on unit testing mocks:

Jest mocks, spies
How to use stubs
London/Chicago testing approach, with the advantages and disadvantages of each one

In this course you will learn how to use Test Driven Development (TDD):

Analyze the advantages of TDD
Hands-on practice with a great coding kata: password checker

Separate section on Jest Integration tests for Rest APIs:

learn how to setup integration tests
learn the difference between integration tests and unit tests
write integration tests for a Rest API with Jest

Dedicated section on Jest React unit testing:

How to test for React components with Jest
How to test React async code
How to debug React Typescript apps

The examples used in the course follow very high coding guidelines for Typescript, NodeJs and React. Async/await syntax is used for clear and concise code, and of course, you will see how to test asynchronous code, on server, but also in the front end.

Course advantages:

Respect for your time: most of the time of the instructor typing is cut off, the course is focused on unit tests and Jest explanations
Concise: learn only what you need, no fillers to make the course falsely more appealing
Experienced and programming active instructor: a great teacher never looses touch with the industry. This is especially true for software development, where the industry is so dynamic. This helps the instructor stay up to date with the best coding guidelines and present you the challenging parts, not the "hello world"
Organized course structure: six parts, progressive approach, consistent content
Code changes in each lecture on Git with code diffs: this will help you get an concise overview of the lecture and correct in case you missed something
Big font, dark background, fullHD content, this way it is readable even on a small screen or even tablet.
Lifetime access
Certificate of completion to present to your current or prospective employer

Do you want your Typescript or NodeJs code to have the best quality, and your project to be safe?

Enroll and start writing your tests in 10 minutes.

What's inside

Learning objectives

Basics of typescript unit testing with jest
Integration tests with typescript
Test driven development (tdd) with jest
Unit testing react with typescript and jest
Cicd with github actions and docker

Jest - the basics: hooks, assertions, matchers
Jest - the advanced parts: aliases, custom matchers, snapshots
Advanced unit testing techniques using jest
Database operations testing with docker and jest

Basics of typescript unit testing with jest
Integration tests with typescript
Test driven development (tdd) with jest
Unit testing react with typescript and jest
Cicd with github actions and docker
Jest - the basics: hooks, assertions, matchers
Jest - the advanced parts: aliases, custom matchers, snapshots
Advanced unit testing techniques using jest
Database operations testing with docker and jest

Syllabus

Getting started

How to take this course

Let's connect!

Tools we will need

Why we need tests

Course resources access

Basics of testing with Jest

Section intro

Jest introduction

Jest project setup

Structure of an unit test

Jest assertions and matchers

Multiple tests structure

Parametrized tests

Let's quickly summarize what you learned in this section!

Intermediate testing topics

F.I.R.S.T. principles

Jest hooks

Testing for errors

Jest aliases and watch mode

VSCode debug configuration

Coverage

Let's remember the FIRST principles!

Test Driven Development with Jest and TypeScript

Test Driven Development intro

Coding Katas - password checker

PassChecker setup

PassChecker Iteration 1

PassChecker Iteration 2

PassChecker Iteration 3

Game coding exercise

Test doubles in Jest

What are test doubles

Stubs

Fakes

Mocks

Spies

Mocking modules

Test doubles in practice

Project presentation

Project installation

Testing arrays

Mocking consumer classes

Injecting mocks

Explaining tests

Event based app - tests

Server tests 1 - setup

Server tests 2 - advanced debugging

Server tests 3 - prototype spies

Finishing the tests

High mock tests conclusion

Low mocks tests

Building testing wrappers

Setup tests

Finishing tests

Low mock tests conclusion

Integration testing

Understanding integration tests

Integration tests setup

Writing integration tests

Well-received intro to testing

Learners largely agree that this is a well-structured course for beginners. The engaging video lectures with clear explanations make it easy to remember and enjoyable to learn. Sal Jade, the course instructor, is praised for her in-depth knowledge of the subject and excellent teaching skills.

Video lectures make learning enjoyable

"very interesting, easy to follow, easy to understand. Very enjoyable"

"I like the way the course is set up"

"she can teach well. She talks widely about each card"

Course is well-structured for beginners

"It was great course for beginners. simple to follow"

"The course is good, profound knowledge. I hope it gets more advance when I follow with the rest"

"Sal's background as a teacher really shows in the way she structures her courses and in the way she produces the content"

Explanations are easy to follow.

"good easy to understand"

"easy to understand and lots of examples"

"easy to understand for beginners"

Sal Jade has in-depth knowledge of the subject

"truly educational course, Sal Jade teaches every aspect of the deck, leaving nothing out"

"I appreciate the instructors intuitiveness and incredible amount of knowledge. Thank you!"

"she really knows her stuff and is a great resource for mastering the tarot!"

Career center

Learners who complete Unit Testing for Typescript & NodeJs Developers with Jest will develop knowledge and skills that may be useful to these careers:

Test Engineer

Test Engineers are responsible for testing software applications to ensure that they meet the requirements of the users. They write test cases, execute tests, and analyze the results. This course will provide you with the skills you need to become a successful Test Engineer. You will learn how to write effective test cases, how to execute tests efficiently, and how to analyze the results.

See salaries and explore the career path for Test Engineer

Web Developer

Web Developers design, develop, and maintain websites. They work with both the front end and back end of a website, ensuring that it is both visually appealing and functional. This course will help you build a strong foundation in unit testing, which is an essential skill for any web developer. Unit testing will allow you to ensure that your website is bug-free.

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Full-Stack Developer

Full-Stack Developers are responsible for the design and development of both the front-end and back-end of a website or application. They work with designers and other developers to create a website or application that is both visually appealing and functional. This course will help you build a strong foundation in unit testing, which is an essential skill for any Full-Stack Developer. Unit testing allows you to test individual units of code, which helps to ensure that the website or application is bug-free and reliable.

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Software Developer

As a Software Developer, you will be responsible for designing, developing, and maintaining software applications. This course will help you build a strong foundation in unit testing, which is an essential skill for any developer. Unit testing allows you to test individual units of code, which helps to ensure that your software is bug-free and reliable.

See salaries and explore the career path for Software Developer

Software Tester

Software Testers are responsible for testing software applications to ensure that they meet the requirements of the users. They write test cases, execute tests, and analyze the results. This course will provide you with the skills you need to become a successful Software Tester. You will learn how to write effective test cases, how to execute tests efficiently, and how to analyze the results.

See salaries and explore the career path for Software Tester

Quality Assurance Analyst

Quality Assurance Analysts are responsible for ensuring that software applications are of high quality. They work with developers to identify and fix bugs, and they also develop and implement quality assurance processes. This course will provide you with the skills you need to become a successful Quality Assurance Analyst. You will learn how to identify and fix bugs, how to develop and implement quality assurance processes, and how to work effectively with developers.

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Software Engineer

Software Engineers use the principles of software development to create new applications or improve existing ones. They analyze user needs and write, test, and maintain code. This course will provide you with the skills you need to write high-quality code that meets the needs of users.

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Software Architect

Software Architects design and develop the architecture of software systems. They work with stakeholders to understand the requirements of the system, and they develop the plans and specifications that will be used to build the system. This course will help you build a strong foundation in unit testing, which is an essential skill for any Software Architect. Unit testing allows you to test individual units of code, which helps to ensure that the system is bug-free and reliable.

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Back-End Developer

Back-End Developers are responsible for the development and maintenance of the server-side of a website or application. They work with front-end developers to create a website or application that is both visually appealing and functional. This course will help you build a strong foundation in unit testing, which is an essential skill for any Back-End Developer. Unit testing allows you to test individual units of code, which helps to ensure that the server-side is bug-free and reliable.

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Front-End Developer

Front-End Developers are responsible for the design and implementation of the user interface of a website or application. They work with designers and back-end developers to create a website or application that is both visually appealing and functional. This course will help you build a strong foundation in unit testing, which is an essential skill for any Front-End Developer. Unit testing allows you to test individual units of code, which helps to ensure that the user interface is bug-free and reliable.

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Technical Lead

Technical Leads are responsible for leading and managing a team of developers. They work with the team to develop and implement software solutions. This course will help you build a strong foundation in unit testing, which is a valuable skill for any Technical Lead. Unit testing allows you to test individual units of code, which helps to ensure that the software solution is bug-free and reliable.

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DevOps Engineer

DevOps Engineers are responsible for the development and maintenance of the software development pipeline. They work with developers and operations teams to ensure that the software development process is efficient and reliable. This course will help you build a strong foundation in unit testing, which is a valuable skill for any DevOps Engineer. Unit testing allows you to test individual units of code, which helps to ensure that the software development pipeline is bug-free and reliable.

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Project Manager

Project Managers are responsible for planning, coordinating, and executing software development projects. They work with stakeholders to define the scope of the project, and they develop and implement the plans and specifications that will be used to complete the project. This course may be helpful for you as a project manager, as it will help you understand the importance of unit testing and the skills that developers use to test their code. It may help you communicate with developers more effectively, and may help you to ensure that the software development project is completed on time and within budget.

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Computer Science Professor

Computer Science Professors teach computer science courses at colleges and universities. They work with students to develop their understanding of computer science concepts, and they conduct research in the field of computer science. This course may be helpful for you as a Computer Science Professor, as it will help you stay up-to-date on the latest unit testing techniques. It may also help you to develop new and innovative ways to teach computer science concepts to your students.

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Data Scientist

Data Scientists use data to solve business problems. They work with data to identify trends and patterns, and they develop models that can be used to make predictions. This course may be helpful for you as a Data Scientist, as it will help you to understand the importance of data quality and the skills that developers use to test their code. It may help you communicate with developers more effectively, and may help you to ensure that the data science project is completed on time and within budget.

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