mgr/dashboard: The reason to test
Give an interesting introduction into our tests.
This task should be split in the following subtasks
1. Describe the benefits of the different tests.
2. Describe consideration that are to be made to decide where I use the one or the other.
3. Show the benefits of different testing strategies (Test first / TDD)
4. Add some best practice links and showcase good tests in our code base.
The benefit of this should be that everybody should be capable of writing tests with the different test scopes in mind.