'Tests a vertical\'s staff lock being set by its sequential'

def test_sequential_source_for_vertical(self):

    self._update_staff_locks(True, True, False)
    self._verify_staff_lock_source(self.vertical, self.sequential)
    self._update_staff_locks(False, True, False)
    self._verify_staff_lock_source(self.vertical, self.sequential)
