<a target="_blank" href="https://www.youtube.com/watch?v=5iJWOPaNZDA">https://www.youtube.com/watch?v=5iJWOPaNZDA</a>
Unit tests should do two things
<ul>
<li>ensure you can refactor the code, and the unit test will still pass
<ul>
<li>So the test must be at a high enough level that it is testing the desired outcome / behaviour of the code, and not testing how the code is implemented</li>
</ul>
</li>
<li>guard against regressions, aka bugs
</li>
</ul>
It's often easy to do one, but it requires thought to do both

[https://www.youtube.com/watch?v=5iJWOPaNZDA](https://www.youtube.com/watch?v=5iJWOPaNZDA)

Unit tests should do two things

* ensure you can refactor the code, and the unit test will still pass
    
    * So the test must be at a high enough level that it is testing the desired outcome / behaviour of the code, and not testing how the code is implemented
        
* guard against regressions, aka bugs
    

It's often easy to do one, but it requires thought to do both

Pragmatic unit testing - summary

I'm an iOS developer, helping millennials with their finances through US neo-bank, Empower.
Before making the switch to development, I was a strategist and GM in the tech space.
