Jest Crash Course - Learn How to Test your JavaScript Application

In this crash course, we will cover Jest which is a terrific JavaScript testing framework

Second Channel:

GitHub Repo:

Timeline:
0:00 - Matcher Methods
28:30 -Testing Async Functions
37:29 - Setting Up & Tearing Down Tests
50:24 - Mocks

[ZTF]

I swear i've been searching for jest crash courses for 30mins now ! and then i get the notification ...
What a day !

[paschalynukwuani]

I just subscribed, because I never knew there was such a great teacher like you teaching JEST on YouTube.

[yaldakarimi]

love your channel, I've recently found you but your channel has everything I was looking for with great quality, thanks a lot

[anarbairam]

You didn't once fail to teach me any concept. Perfect teaching skills you have! Great explanation once again.

[OussamaFahchouch-un]

Thanks for the quick and short crash course for Jest beginners!

[eliasvasques]

Terrific, the best tutorial I found on youtube about mocks.

[RacheleMargutti]

It couldn't be clearer, thank you!

[sagniksaha]

If anyone wants to clarify that why 3 === 3 is true and {} === {} is false, it is because in case of 3 === 3 is compared by value whereas objects are compared by hashcode(a location of the memory where the object exists). When you are comparing {} === {} then these are two different object at two different memory location which result in two different hashcode for comparison and thus return false. I hope I have done a good job in clarifying it 😅

[dawid_dahl]

Great course, thanks for including mocks and not just the simple pure function stuff.

[maximus]

Laith, you do deserve a 1M Subs for sure!
Thanks for the content.

[mnmsagar]

Best Explanation Ever for Jest, Just Incredible

[soumyajitdey]

Exactly the crash course I wanted!! Thanks Laith.

[shivakugan]

Спасибо за новое видео. Уже давно слежу за вашим каналом, нашла много полезного для себя.

[VictorKorovin-sq]

Very cool, thanks! I am starting to learn jest. Your course has been very helpful!

[stressed-ashen-cat]

I have to say, you have the best quality tutorials out there!

[vurrnurr]

For anyone who struggled to understand how the mock.calls worked, as I did, too, initially - here is what [x] [y] mean: x represents the index of the call made (i.e. 0 = first call, 1 = second call, 2 = third call etc) and y represents the index of the first argument we find on that call (i.e. always 0 as we only have one argument).

So, taking our example in the tutorial - [1] represents the second call and [0] first argument, which in this case is 1. Hope this helps to clarify and keep up the good work studying!

Thanks Laith Academy! <3

[jahelsantiago]

wow you create the video in one shot, that is amazing

[hiteshsuthar]

Thanks for providing Jest & React testing Library courses 🙏

[IslamicHarmonyChannel]

Came here from Net Ninja!

New Subscriber!

[g-ytub]

Thank you so much. since long I was not able to get understanding of mocking which you explained practically in good way.. thanks and keep on.