Add coverage for Python torch bindings

.codecov.yml

@@ -13,3 +13,4 @@ fixes:
   # map coverage collected inside tox virtual environments
   # to the source dir in git
   - ".tox/all-deps/lib/*/site-packages/::python/"
+  - ".tox/torch-tests/lib/*/site-packages/::python/"

.github/workflows/coverage.yml

@@ -69,10 +69,15 @@ jobs:
           lcov --remove coverage.info '/usr/*' "$(pwd)/rascaline-c-api/tests/*" "$(pwd)/rascaline-c-api/examples/*" --output-file coverage.info
 
       - name: collect Python coverage
-        run: tox -e all-deps
+        run: |
+          tox -e all-deps
+          tox -e torch-tests
+        env:
+          # Use the CPU only version of torch when building/running the code
+          PIP_EXTRA_INDEX_URL: https://download.pytorch.org/whl/cpu
 
       - name: upload to codecov.io
         uses: codecov/codecov-action@v3
         with:
           fail_ci_if_error: true
-          files: target/tarpaulin/cobertura.xml,.tox/coverage.xml,coverage.info
+          files: target/tarpaulin/cobertura.xml,.tox/coverage-all-deps.xml,.tox/coverage-torch-tests.xml,coverage.info

tox.ini

@@ -25,6 +25,7 @@ metatensor-torch-requirement =
     metatensor-torch @ https://github.com/lab-cosmo/metatensor/archive/2248a3c.zip\#subdirectory=python/metatensor-torch
 
 build-single-wheel = --no-deps --no-build-isolation --check-build-dependencies
+test_option = --cov={env_site_packages_dir}/metatensor --cov-report xml:{tox_root}/.tox/coverage-{env_name}.xml --import-mode=append
 
 commands =
     # error if the user gives a wrong testenv name in `tox -e`
@@ -55,7 +56,7 @@ deps =
     pytest-cov
 
 commands =
-    pytest --cov={env_site_packages_dir}/rascaline --cov-report xml:.tox/coverage.xml --import-mode=append {posargs}
+    pytest {[testenv]test_option} {posargs}
 
 
 [testenv:min-deps]
@@ -73,6 +74,7 @@ deps =
     {[testenv]metatensor-torch-requirement}
 
     pytest
+    pytest-cov
     numpy
     torch
     ase
@@ -85,7 +87,7 @@ commands =
     # install rascaline-torch
     pip install . {[testenv]build-single-wheel} --force-reinstall
     # run the unit tests
-    pytest --import-mode=append --assert=plain {posargs}
+    pytest {[testenv]test_option} --assert=plain {posargs}
 
 [testenv:docs]
 deps =