Extends ThemeTest in sw with the use cases relevant for import of FormatScheme into the model::Theme (as much as it is implemented currently). Change-Id: I888f64c24ba455913d688be256f095d9c298dc2f Reviewed-on: https://gerrit.libreoffice.org/c/core/+/147693 Tested-by: Jenkins Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>