After #32415 and #32708, the code in the module sage.tensor.modules does no longer contain any dependency on symbolic parts of Sage. There remains however some doctests that invokes SR. They have been introduced to check a bug fix performed in #22520. In view of Sage modularization, they are marked # optional - sage.symbolic in this ticket.

Depends on #32708
Depends on #32614

CC: @mkoeppe @tscrim

Component: refactoring

Author: Eric Gourgoulhon

Branch/Commit: c3ff514

Reviewer: Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/32712