Introduction to Jest Testing | JavaScript Unit Tests

In this Introduction to Jest testing, you will learn how to write JavaScript Unit Tests and why you should write them. Jest is a popular testing framework that helps you verify your code works like you think it should.

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Introduction to Jest Testing | JavaScript Unit Tests

(00:00) Intro
(00:10) Welcome
(00:32) Lesson Goal
(00:51) Why Write Tests?
(01:24) Quick Note
(01:42) Install Node for npm
(02:04) Checking your Node install
(02:39) A Simple Function
(03:15) Install Jest
(04:24) Your First Unit Test
(05:42) How to Run Tests
(06:41) What is a Unit Test?
(07:14) Testing a 2nd Function
(12:07) Testing a 3rd Function
(16:09) Drilling Down to a Single Responsibility
(22:25) Generating a Coverage Report
(24:40) Wrap up

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Was this tutorial about writing JavaScript Unit Testing with Jest helpful? If so, please share. Let me know your thoughts in the comments.

#jest #testing #javascript

[sandroffdsantos]

Been using Jest testing for web applications for almost 6 months and one thing that i´ve noticed on the web was the lack of a well structured tutorial about software testing and more specifically Jest Testing.
So thank you Dave for the amazing content.
Looking forward for a further chapters of this educational content.

[chiragchhajed]

Wow, I can't express how excited I am to see you've started a testing tutorial series! 🙌 I've been looking forward to learning more about testing for quite a while, and your videos are just what I needed.

[TonyStark]

Much needed video, please cover unit testing, integration testing, End to end testing, React test library, Cypress

[mihaivisovan]

After a one year programming break, I really needed this playlist. I already knew all of them, but this was the best refresher I needed. Clean, short and very easy to understand. Please keep up the good work and continue making youtube videos!!!

[ahmad-murery]

Hello my friend,
I don't do testing very often due to very strict deadlines, but it's always good to do so,

8:30 since we're passing an empty string to the join method no commas will be created, on the other hand, passing nothing(undefined) will add commas,

Thanks Dave!

[codersdance]

Thank you so much. I have no words to appreciate the way you teach.

won't include the commas. So we won't need the replaceAll part. I know you know this, but you just came up with a quick solution. Mentioned it for the viewers.

[mrbilchalan]

pls, continue this. thank you again, Dave.

[LorenzoJimenez]

Real nice! Thanks. I will add the tests when the strings are null or undefined.

[omidoyinayodeji]

Oh thank you for this series. I can't wait for you to get to the advanced testing such as making network requests, redux, axios interceptors and watching every testing video you are making....

[OpossumPiper]

Awesome intro to unit testing with jest. We use jest extensively at my job. This is a great way to get back to basics, understand how jest integrates with npm, and how to use it to write better code!

[rdubb]

Great video, I like how you use non trival examples and work in clean code principles.

[frankkim]

Cannot wait to see the content about cypress vs jest, and when we need to use them. Lovely.

[stevieholland]

I am sure you get a million requests for topics, but could you please do a data structures and algos course? Basic linked lists, trees and graphs, big O, recursion etc. Your explanations are so in depth and helpful. I would love to see a dsa playlist at some point. Forgive me if you have this and I just have not found it yet.

[md-abid-hussain]

Didn't see that comming.
Excited for this series

[crixcodex]

Thanks Dave, you've really helped on my Javascript journey i do really appreciate... I wish you could talk about getting a job, cause i feel I've been writing codes for myself, but all same thanks alot

[alirezagarshasbi]

I just started testing for an e-commerce web app created with next js and typescript
i had hard time configuring jest and typescript for unit and component testing
but setup cypress pretty easily
i hope this video help me understand jest and testing better
thank you Dave for great content

[MichaelShingo]

nice intro to jest thank you, excited to integrate this into my Next.js app

[bugraotken]

I have just finished a 3 hours long Cypress tutorial with E2E and Component testing. Let's see what Jest brings us =)) Thank you Dave!

[shubhamgupta-bltr]

Sir please make a video on how to test the react component which includes redux, custom hooks with mock api...I mean to test complex react components

[ichiroutakashima]

Seriously, Dave! Thank you so much for doing this! Your channel as really helped me grow and progress within my journey! I've been trying to find some content creator that would create content solely for JEST! Thank you so much!