Add basic collection removal test for TodoTreeModel
Add basic collection removal test for TodoTreeModel

Signed-off-by: Kevin Ottens <f6ebb8b5f342fb093fa46a1195c6c9fb6deb62d5@kde.org>

kolab-groupware/zanshin,kolab-groupware/zanshin,sandsmark/zanshin,sandsmark/zanshin,sandsmark/zanshin,kolab-groupware/zanshin