Unit testing for beginners

[David Heffernan 2345]

8 minutes ago, Mike Torrettinni said:

From all the blogs I read, I didn't come across anything like such a simple explanation.

I don't think it is this simple though

[Darian Miller 361]

7 hours ago, Mike Torrettinni said:

From all the blogs I read, I didn't come across anything like such a simple explanation.

 

There are a number of uses for Unit Testing.  Purists have their specific definitions, but it's a tool just like any other.  You choose how to use it.  Now, a hammer has some specific purposes like pounding in nails but you could use a hammer for quite a few more useful things.  

 

My advice is to start small - think of unit tests as simple stop/go signs for your code.  Set a bare minimum functionality for each test.  Then think about what possible abnormal inputs might occur and test for a few of those.  Over time you'll end up with a large number of tests that add value to your operation.  They will guard against you releasing some bugs that you might not have caught before.

 

Once you start feeling comfortable with tests, then other uses arise.  Like you start taking a little more risk - as you rely on your tests to keep you on the right path.  Once you can take more risks, you could potentially make larger leaps forward in functionality.  It's a self-feeding positive cycle.  But in the beginning, add a single test and watch it fail.  Your skill level went up +1.  Now make that one test work and and then watch the test pass.  Skill level +1.   Write a little code and add another test...  eventually write the test before the code is written (I don't do this often but when I have it has saved some time.)

 

 

 

[Lars Fosdal 1792]

Any problem can be expanded into something insurmountable if one so likes.
But, if you apply the KISS and Pareto rules- you can at least start out with a less complicated scenario.

[Der schöne Günther 316]

I also find unit tests are a great way to start getting familiar with foreign code. Like libraries from 3rd parties or your own company. You're new to it, you don't really have a feeling for it yet. So before just straight out using the code in your real life application, why not start with a few unit tests so you know you can trust it for your use cases? Maybe you can even contribute the tests back.

[Mike Torrettinni 198]

OK, first test done successful! 🙂

Things are much clearer now!

 

This video is for real beginners, very easy to follow:

 

 

 

Thanks for the help everybody!