Add code coverage by Codecov (#88)

.github/workflows/ci.yml

@@ -60,7 +60,15 @@ jobs:
         PYTEST_ADDOPTS: "--durations=0"
       run: |
         aiida-mock-code || true
-        cd tests; pytest
+        pytest -s --cov=aiida_test_cache tests/
+
+    - name: Upload coverage report
+      uses: codecov/codecov-action@v5
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        name: pytest-py${{ matrix.python-version }}
+        files: ./coverage.xml
+        fail_ci_if_error: false  # don't fail job, if coverage upload fails
 
   pre-commit:
     runs-on: ubuntu-latest

pyproject.toml

@@ -57,6 +57,7 @@ tests = [
     "aiida-diff",
     "pytest-datadir",
     "pytest-mock",
+    "pytest-cov>=4.0",
 ]
 pre_commit = [
     "pre-commit",
@@ -76,6 +77,7 @@ aiida_mock_code = "aiida_test_cache.mock_code"
 aiida_archive_cache = "aiida_test_cache.archive_cache"
 
 [tool.pytest.ini_options]
+addopts = '--durations=10 --durations-min=3 --strict-config --strict-markers -ra --cov-report xml --cov-append'
 filterwarnings = []
 
 [tool.yapf]