Throwaway projects aside, would you say testing is important?

Tests are important but

It takes too much time

We dont have time for that

I dont know how to

I do it manually

My code is perfect!

However

Have you ever had the need to fix something for someone just for it to break it to someone else?

How about fearing touching the files someone else created?

How about it just stopped working and when you finally found out why it was because some dependency changed something (or someone changed a file you are dependent on)?

Are you debugging or manually testing, again the code youve been debugging and manually testing since last week?

And what happenedwas

To lose a lot of time chasing a bug that appears out of nowhere or to dredge through the work of someone else.

Test is likecoding

Remember learning to code?

Your first tests will be awful, but they will still help you.

Heres an example:

pnpm install# unit testspnpm test# e2e testspnpm test:cy

I purposely made this as naive as possible. The biggest problem is that its flaky, but there are others.

Being flaky means that changes will easily break the test, meaning you will have to fix the tests every time you change the code if you test them like this.

But it will work, it will help and even save more time than if you were doing it all manually or just hoping it doesnt break.

And as you learn how to test and best practices youll start refactoring your tests (yes, tests are also code that should be refactored) and making more resilient tests, with fewer bugs (yes, tests can also have bugs), also tests that test more than just if its working (example: you can test accessibility by using selectors that work with semantic tags and roles).

The more youtest

In my experience, the more I test and the better the coverage, the less I have to rely on manually using it on every change and even less I have to debug.

Not only that, everyone on the team benefits from those tests. They are already there and telling you what should be working and how. And when something breaks, it tells everyone exactly where.

If you get a tested piece of software, you dont need to know and keep in your mind all the complex rules the code needs to work, so when you need to refactor or change it, you will always know if it's still working or not and be able to catch if the breaks on the test are intended or not.

So what other benefits do you find with testing or what still holds you back from testing?

Photo by National Cancer Institute on Unsplash