In any language, we can write code that accomplishes some purpose; however, to write performant and bug-free code, we need to use every available resource we can.
Unit tests are one of the things that can help us to write modular, efficient, and bug-free code. The unit test is not the only way of testing code, of course, but it's a crucial part of testing small pieces of software in a manner that isolates it from other parts, helping us to focus on specific things.
Covering all of the application code with unit tests does not guarantee that it's 100% bug-free; however, it helps us to achieve mature code progressively, and this is one of the steps to ensuring a good development cycle, with stable releases from time to time.
Dart also provides some useful tools to work with tests; let's take a look at the starting point of unit testing...
