A professional application is a tested application. Automated testing allows you to verify your logic quickly and consistently.
1The Testing Stack
Angular comes pre-configured with a powerful testing stack. Jasmine is the framework that provides the 'Behavior Driven Development' (BDD) syntax—using human-readable functions like describe and it. Karma is the test runner; it's the engine that physically opens a browser, executes your code, and reports back if your assertions passed or failed. Together, they allow you to catch regressions before they ever reach production.
2The Test Bed
Testing a framework component is harder than testing a simple function because components have dependencies and templates. The TestBed is Angular's solution. It allows you to 'configure' a mini-module specifically for your test. You can declare components, import modules, and provide mock services. This isolation ensures that if a test fails, you know exactly which component is at fault, rather than being confused by errors in its dependencies.
