Fix unit tests (update mockito)

[rudi]

fixes #563

[zoeself]

@rudi thank you for your Pull Request. I'll assign someone to review it soon.

If this PR solves a todo from the code, please don't forget to remove it.

[zoeself]

@amihaiemil I couldn't find any assignee for this task. This is either because there are no contributors with role REV available or because the project does not have enough funds.

Please, make sure there is at least one available contributor with the required role and the project can afford to pay them.

[amihaiemil]

@rultor merge it please

[rultor]

@rultor merge it please

@amihaiemil OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor merge it please

@amihaiemil Done! FYI, the full log is here (took me 3min)