Unit test should not depend of any external sources

[dancespiele]

Description

Currently most of the unit tests have a instance of Nevermined which depend of tools for example this is one case. Unit test should not depend of any external sources, also we should consider if theses integrations are already covered in integration tests and in that case we should remove

Acceptance criteria

• Nevermined should be mocked
• Unit tests should not depend of any external sources
• Clean up unit tests which are already covered in integration tests