Run ng test to execute the tests
Run ng serve to run localhost:4200/
http://amilspage.com/angular2-testbed-for-shallow-testing/
https://angular.io/guide/testing
https://blog.nrwl.io/essential-angular-testing-192315f8be9b
https://christianlydemann.com/all-you-need-to-know-about-mocking-in-angular-tests/
https://github.com/getsaf/shallow-render/blob/master/README.md
https://github.com/ngneat/spectator/blob/master/README.md
https://habr.com/ru/company/ruvds/blog/477278/
https://habr.com/ru/post/349380/
https://medium.com/@getsaf/testing-angular-components-with-shallow-render-9334d16dc2e3
https://netbasal.com/spectator-v4-a-powerful-tool-to-simplify-your-angular-tests-bd65a0bf317e
https://vsavkin.com/three-ways-to-test-angular-2-components-dcea8e90bd8d
https://www.simars.io/angular-test-components-unit-shallow-deep/