Run cov in src and not in tests

[osanseviero]

[do not review yet]

Cov was just looking at coverage in tests, meaning that it was complaining that our tests were not tested. See the diff with this PR
https://app.codecov.io/gh/huggingface/huggingface_hub/compare/925/overview.

Example issues from past few days

• https://app.codecov.io/gh/huggingface/huggingface_hub/compare/924
• https://app.codecov.io/gh/huggingface/huggingface_hub/compare/889

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[osanseviero]

I'm not sure if codecov works for us. Our tests don't do relative import, they pip install huggingface_hub and then run the tests, and I think that confused codecov as it does not know what is being tested

[osanseviero]

So for example, locally

pytest --cov=src/huggingface_hub  ./tests/test_utils_sha.py

Gives me

----------- coverage: platform linux, python 3.9.7-final-0 -----------
Name                                              Stmts   Miss  Cover
---------------------------------------------------------------------
src/huggingface_hub/__init__.py                      37     37     0%
src/huggingface_hub/_commit_api.py                  114    114     0%
src/huggingface_hub/_snapshot_download.py            62     62     0%
src/huggingface_hub/commands/__init__.py             10     10     0%
src/huggingface_hub/commands/huggingface_cli.py      16     16     0%
src/huggingface_hub/commands/lfs.py                  73     73     0%
src/huggingface_hub/commands/user.py                166    166     0%
src/huggingface_hub/constants.py                     32     32     0%
src/huggingface_hub/fastai_utils.py                 102    102     0%
src/huggingface_hub/file_download.py                318    318     0%
src/huggingface_hub/hf_api.py                       654    654     0%
src/huggingface_hub/hub_mixin.py                     87     87     0%
src/huggingface_hub/inference_api.py                 34     34     0%
src/huggingface_hub/keras_mixin.py                  136    136     0%
src/huggingface_hub/lfs.py                          157    157     0%
src/huggingface_hub/repocard.py                      88     88     0%
src/huggingface_hub/repocard_types.py                37     37     0%
src/huggingface_hub/repository.py                   579    579     0%
src/huggingface_hub/snapshot_download.py              4      4     0%
src/huggingface_hub/utils/__init__.py                 2      2     0%
src/huggingface_hub/utils/_deprecation.py            27     27     0%
src/huggingface_hub/utils/_errors.py                 25     25     0%
src/huggingface_hub/utils/_fixes.py                   7      7     0%
src/huggingface_hub/utils/_subprocess.py              8      8     0%
src/huggingface_hub/utils/endpoint_helpers.py        93     93     0%
src/huggingface_hub/utils/logging.py                 53     53     0%
src/huggingface_hub/utils/sha.py                     14     14     0%
---------------------------------------------------------------------
TOTAL                                              2935   2935     0%

[Wauplin]

I close without merging since it's outdated. The problem is properly listed in issue #977.