sage.tensor.modules: make doctests involving SR optional

[egourgoulhon]

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.

[egourgoulhon]

New commits:

​1635bd3	Remove import of Chart in sage.tensor.modules (#32708)
​f46cce7	Remove SR doctests in sage.tensor.modules (#32712)

[mkoeppe]

Instead of removing them, they could be marked as optional using #32614: See #32652 for an example

[egourgoulhon]

Replying to mkoeppe:

Instead of removing them, they could be marked as optional using #32614: See #32652 for an example

Very good. Should the tag be # optional - sage.symbolic.ring ?

[mkoeppe]

see src/sage/features/sagemath.py (after merging #32614): just sage.symbolic

[egourgoulhon]

Replying to mkoeppe:

see src/sage/features/sagemath.py (after merging #32614): just sage.symbolic

OK, perfect.

[egourgoulhon]

New commits:

​c3ff514

Make SR doctests optional in sage.tensor.modules (#32712)

[egourgoulhon]

Here we go...

[mkoeppe]

Tested with #32601:

$ ./bootstrap && make sagelib-build-deps && ./sage -sh -c '(cd pkgs/sagemath-standard-no-symbolics && SAGE_NUM_THREADS=16 tox  -v -v -v -e py39-sagewheels-nopypi)'
[...........]
$ pkgs/sagemath-standard-no-symbolics/.tox/py39-sagewheels-nopypi/bin/sage -tp src/sage/tensor
too many failed tests, not using stored timings
Running doctests with ID 2021-10-18-23-57-24-ccafbd20.
Using --optional=argcomplete,build,ccache,dochtml,e_antic,homebrew,normaliz,pip,pynormaliz,sage,sage.rings.real_double,sage_spkg
Sorting sources by runtime so that slower doctests are run first....
Doctesting 19 files using 8 threads.
sage -t --random-seed=0 src/sage/tensor/modules/free_module_morphism.py
    [251 tests, 0.21 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_automorphism.py
    [243 tests, 0.20 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_alt_form.py
    [170 tests, 0.28 s]
sage -t --random-seed=0 src/sage/tensor/modules/alternating_contr_tensor.py
    [150 tests, 0.32 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_linear_group.py
    [112 tests, 0.16 s]
sage -t --random-seed=0 src/sage/tensor/modules/finite_rank_free_module.py
    [523 tests, 0.42 s]
sage -t --random-seed=0 src/sage/tensor/modules/ext_pow_free_module.py
    [187 tests, 0.15 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_basis.py
    [166 tests, 0.14 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_homset.py
    [97 tests, 0.14 s]
sage -t --random-seed=0 src/sage/tensor/__init__.py
    [0 tests, 0.00 s]
sage -t --random-seed=0 src/sage/tensor/all.py
    [0 tests, 0.00 s]
sage -t --random-seed=0 src/sage/tensor/modules/__init__.py
    [0 tests, 0.00 s]
sage -t --random-seed=0 src/sage/tensor/modules/all.py
    [0 tests, 0.00 s]
sage -t --random-seed=0 src/sage/tensor/modules/format_utilities.py
    [64 tests, 0.04 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_element.py
    [62 tests, 0.08 s]
sage -t --random-seed=0 src/sage/tensor/modules/tensor_free_module.py
    [129 tests, 0.14 s]
sage -t --random-seed=0 src/sage/tensor/modules/free_module_tensor.py
    [638 tests, 2.23 s]
sage -t --random-seed=0 src/sage/tensor/modules/comp.py
    [980 tests, 3.14 s]
sage -t --random-seed=0 src/sage/tensor/modules/tensor_with_indices.py
    [233 tests, 4.01 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 4.1 seconds
    cpu time: 11.0 seconds
    cumulative wall time: 11.6 seconds

[egourgoulhon]

Thank you for the review !