def test_remove_principal(dummy_user, dummy_event):
folder = AttachmentFolder(object=dummy_event, is_default=True)
assert not folder.acl_entries
entry = folder.update_principal(dummy_user, read_access=True)
assert folder.acl_entries == {entry}
folder.remove_principal(dummy_user)
assert not folder.acl_entries
# doesn't do anything but must not fail either
folder.remove_principal(dummy_user)
assert not folder.acl_entries
