Explicit None check
Make bool_matrix more powerful
Support groups in mock avatar
Test Room.can_be_booked and Room.can_be_prebooked
Typo: Room.can_be_overriden => can_be_overridden
Cleanup Room.can_be_modified

We never pass an AccessWrapper to that function
Remove empty file
Test no user / no rb access cases
Test remaining Room.can_be_* methods
Test room ownership functions
Test Room.check_advance_days

Also make sure that method doesn't return None for consistency reasons.
Test Room.check_bookable_hours
Parametrize bookablehours / nonbookableperiods tests
Add create_blocking ficture
Missing docstrings, unicode cleanup
Test Room.filter_available
Check explicitly against is None
Flush db on add_edit_log()
Reorder methods
Add more Reservation tests