Angular Unit Testing

This project was generated with Angular CLI version 11.2.3.

Running unit tests

Run ng test to execute the unit tests via Karma.

3 types of testing

• Unit Testing : Testing a component in isolation without external resources (without template)
• Integration Testing : Testing a component with external resources (along with template)
• End-to-End Testing : Test the entire application as a whole (more confidence, very slow, very fragile)

Unit Testing

• Testing a component in isolation without external resources (eg: file system, API etc)
• Testign a component without template
• Creating a fake service it it's using service

Unit tests are

• Easier to write

• Super fast

• Don't give us much confidence

• Unit test are first class citizens

Clean coding practices

• Small function/methods (10 lines of code or lesser)

• Proper naming

• Single responsibility

• Unit testing in angular uses Karma runtime and jasmine framework

Unit testing can be done for

• Pattern
• State changes
• Forms
• Events (Output properties)
• Services

Unit Testing Limitation

• Routers => Not easy to test can be done in integartion testing
• Template binding => Need template, we need to load component

Code Coverage

• run ng test --code-coverage whch creates folder int the project
• It should be good to have 70% of code coverge, again it depends on time and budget of the project.

To disable a test add 'x' before function