In Memory Database for Unit Tests

[janniclas]

It would be great to have an in memory database to mock the data retrieved by the backend to ease unit testing. There is a relatively new project from angular which allow us to create such in memory database meant for testing( https://github.com/angular/in-memory-web-api ).
In the newest version of the angular tutorials this in memory database is used to mock api calls and after a first look it looks really nice.
I created a first version of how this might look on this branch https://github.com/delphi-hub/delphi-management/tree/feature/inMemoryTest and successfully mocked the instances and the sysInfo tab, but the work has to be finished for the other endpoints.

[janniclas]

@Naveenkumar27 if you are free, please have a look into this, else unassign yourself so I know I have to look for someone else for this task.

[Naveenkumar27]

I am going through the links provided for this task. I will get back to you if anything is required.