Bug #5329 - adjusting some unit test wrappers according to the recent WysiwygManager creation.

Please don't forget to check the PR https://github.com/Silverpeas/Silverpeas-Core/pull/514.

Must be integrated after the following PR:
- https://github.com/Silverpeas/Silverpeas-setup/pull/17
- https://github.com/Silverpeas/Silverpeas-Core/pull/513