Jasmine, Karma, Angular how to write test on my Angular app?

I have just jumped to another project and, basically, I have been asked to write Unit tests. Since I have already know Protractor for e2e testing, I now switched to Karma and Jasmine to carry out unit testing. I have already downloaded karma, jasmine, karma-jasmine, and karma-chrome-launcher. I installed angular-mocks as well so I should be ready to start. I have read many things on the internet but, now, what I really need is a concrete example of a real app to figure out how to start writing tests. I don't need easy examples but concrete examples and full explenations. Books and useful links are appreciated as well. Thanks in advance for your help/time.