2020
https://habr.com/ru/company/tinkoff/blog/516622/
https://habr.com/ru/company/tinkoff/blog/507906/
https://dev.to/qarunqb/tdd-in-angular-dependency-injection-and-mocking-4jnh
    https://github.com/Qarun-Qadir-Bissoondial/ng-jasmine-testing-demo/tree/dependency-injection-and-mocking
2018
https://medium.com/@tomastrajan/total-guide-to-angular-6-dependency-injection-providedin-vs-providers-85b7a347b59f
    https://habr.com/post/429342/
OtusRu - Open Webinar DI in Angular
    https://www.youtube.com/watch?v=sNGhaLIm2ho