What is Unit Testing ? Unit testing is testing a unit in an isolated environment. A unit can be a class, component, service, directive module etc. which can
Unit testing is testing a unit in an isolated environment. A unit can be a class, component, service, directive module, etc. which can be logically separated from the software. Any unit in an app is not isolated, it’s quite normal that it will be depending on the other units in an application for resources like data or methods.
So if we do an integrated test of the application and it fails then it’s hard to identify where exactly the code is breaking. So the purpose of unit testing is to test each unit individually and see if it’s working fine.
Reveal design mistakes
You may encounter difficulty while writing tests which might reveal that the design is not correct and you may be violating some important coding principles. Or after running the test it shows unexpected behavior.
Add new features without breaking anything
If you add any new feature into existing code and after running test passes then you can be confident it won’t break the application.
Simplifies debugging process
As discussed earlier it makes it easy to exactly identify where the code is breaking.
Tests make developers more confident about their work
So, we will understand unit testing in angular by looking at some basic simple examples and then getting to know why and how we have done.
When starting a new Angular application, the Angular CLI sets up everything you need for unit testing using Karma and Jasmine. In this article, I will show you how to ditch Karma and Jasmine and use Jest as your unit testing framework and runner.
The shift towards microservices and modular applications makes testing more important and more challenging at the same time. Learn more here.
Install Angular in easy step by step process. Firstly Install Node.js & npm, then Install Angular CLI, Create workspace and Deploy your App.