Overview of the feature request

Add unit tests for related entities on the generated dotnet application.

As an example:
Unit tests for Employee should test adding and removing its Department relationship.

Motivation for or Use Case

Currently the unit tests only adds/removes the main entity.
Changes to the generator may cause issues regarding relationships and are not caught by tests.
This is important to make sure that new PR's are not breaking relationship functionality at this project.

Related issues or PR

• Checking this box is mandatory (this is just to show you read everything)