long test in tensorfield.py needs # long time #32967
Description
I think this probably qualifies as a "long time" test:
File "src/sage/manifolds/differentiable/tensorfield.py", line 4296, in sage.manifolds.differentiable.tensorfield.TensorField.dalembertian
Warning, slow doctest:
De = e.dalembertian(); De
Test ran for 19.05 s
CC: @egourgoulhon @tscrim @sagetrac-mbejger
Component: manifolds
Author: Michael Orlitzky
Branch/Commit: e74039c
Reviewer: Dima Pasechnik
Issue created by migration from https://trac.sagemath.org/ticket/32967