Introduction to Test-Driven Development (TDD) with TypeScript | 2021

Tests give you confidence that your code is free of bugs, makes it safe to refactor, prevents regressions, and keeps you productive in the long term.

The easiest way to write testable code is to write the test first.

In this introduction to Test-Driven Development (TDD), we learn about the basics of TDD and how to implement the Red-Green-Refactor loop using TypeScript and Jest.

0:00 Intro
0:13 Why write tests?
1:00 Why don't developers write tests more often?
1:26 Testing is architectural
2:29 What is TDD & how does it work?
3:07 TDD is a process
3:36 Double Loop TDD
3:50 TDD Demonstration
12:18 Conclusion

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LEARN TO WRITE TESTABLE, FLEXIBLE, MAINTAINABLE CODE (BLOG)
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SOLIDBOOK.IO (THE SOFTWARE DESIGN & ARCHITECTURE HANDBOOK)

[MykalMachon]

This is such a solid example of how TDD can work in practice.
Would love to see a more "real-world" example while working on an app, I've found TDD is easy when you're building out pretty simple apps, but it gets hard in real world situations

[someonlinevideos]

Super excited to see video as a new outlet for your helpful instruction :) It's my preferred way to learn

[jeangauvin]

I love your way of teaching Khalil. I just started your solid book and i really love it. ❤️ Such a great step by step explanation! I read all the reference DDD books out there. But, for me, the best explanation so far, is yours .
Do you plan to make the DDD video course you put on your website where you make a real life project ? I am can't wait to see that course. I would buy it immediately!! 🤩
Thanks for the effort you are making to share your experience!

[Felipe-]

You're a very talented teacher. Consider uploading more videos. Love your blog!

[Coderunna]

Great video! It was clear, which made it easy to understand. Looking forward to more!

[CarlosAlbertoSilvaJunior]

Great explanation and example Khalil. Thanks very much! I'm looking forward to watching more of your videos!

[JacSteiner]

Would love to see acceptance testing video as well. Thanks for this one 🙏🏽.

[jorgezozaya]

There is a lot of value in here. Thanks for the content ant waiting for the curse.

[bergman]

Such a great and easy to understand video, great job!

[kevinminutti]

Awesome! This is was very helpful. Keep up the good work!

[vitinhuU]

After watching this video, I finally decided to buy your book!

[liquidDeath]

Your blog is literally sex...dude, Ive been searching for TDD guides all weekend. This is the one!

[pancakesandsyrup]

Very informative and understandable video, great job! Helped me a ton :)

[codingjitsu]

This was great! simple and to the point. Great job!

[Maikelmg]

Very good and clear introduction!! Thanks

[yashtibrewal]

Good content.
Would appreciate, if you level it up ( this was a basic function ),
how about some apis?

[mabroorahmad]

That is such an elegant approach! Love it!

[matthewvaccaro]

Writes the best TDD video on the web and then. Disappears. Come back!!!

[mahdiaghaei]

Awesome, Hope he get back to make videos

[frigolitmonstret]

What's the point of creating a class (PalindromeChecker) just to hold a single (pure) function?