Implement Tests

[solverat]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	/no
RFC?	no

Open Test-Sections:

• [ ] Inheritance (Functional, ~need to remove controller logic first~ done)
• [ ] ExtJs (Acceptance)
• [ ] Restricted Asset Downloads (Acceptance)
• [x] Navigation Tests (Functional)
• [ ] Listing Tests (Functional), for each type (especially assets)
• [ ] Guard (Unit/Functional)
• [ ] OAuth (Unit/Functional)