add option to generate test coverage report without codecov

.github/workflows/tox.yml

@@ -117,8 +117,6 @@ jobs:
   envs:
     name: Load tox environments
     runs-on: ubuntu-latest
-    outputs:
-      matrix: ${{ steps.set-outputs.outputs.matrix }}
     steps:
       - uses: actions/setup-python@0b93645e9fea7318ecaed2b359559ac225c90a2b  # v5.3.0
         with:
@@ -142,6 +140,8 @@ jobs:
           --runs-on "${{ inputs.runs-on }}" --default-python "${{ inputs.default_python }}" \
           --timeout-minutes "${{ inputs.timeout-minutes }}"
         shell: sh
+    outputs:
+      matrix: ${{ steps.set-outputs.outputs.matrix }}
 
   tox:
     name: ${{ matrix.name }}
@@ -238,3 +238,45 @@ jobs:
         uses: codecov/codecov-action@015f24e6818733317a2da2edd6290ab26238649a  # v5.0.7
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+
+      - name: Upload coverage data to GitHub
+        if: ${{ (success() || failure()) && contains(matrix.coverage, 'github') && matrix.pytest == 'true' }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: .coverage.${{ github.sha }}-${{ runner.os }}-${{ runner.arch }}-${{ matrix.toxenv }}
+          path: "${{ github.workspace }}/**/.coverage"
+
+  report_overall_test_coverage:
+    needs: [ tox ]
+    if: always()
+    name: report overall test coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+          submodules: ${{ inputs.submodules }}
+          ref: ${{ inputs.checkout_ref }}
+      - uses: actions/download-artifact@v4
+        with:
+          pattern: .coverage.*
+          merge-multiple: true
+      - id: check_downloaded_files
+        run: |
+          [ "$(ls -A .coverage*)" ] && exit 0 || exit 1
+        continue-on-error: true
+      - if: steps.check_downloaded_files.outcome == 'success'
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - if: steps.check_downloaded_files.outcome == 'success'
+        name: generate coverage report
+        run: |
+          python -Im pip install --upgrade coverage[toml]
+          python -Im coverage combine
+          python -Im coverage report -i -m --format=markdown >> $GITHUB_STEP_SUMMARY
+      - if: steps.check_downloaded_files.outcome == 'success'
+        uses: actions/upload-artifact@v4
+        with:
+          name: .coverage
+          path: .coverage

docs/source/tox.rst

@@ -159,8 +159,8 @@ This option has no effect if ``pytest`` is ``false``.
 coverage
 ^^^^^^^^
 
-A space separated list of coverage providers to upload to. Currently
-only ``codecov`` is supported. Default is to not upload coverage
+A space separated list of coverage providers to upload to, either
+``codecov`` or ``github``. Default is to not upload coverage
 reports.
 
 See also, ``CODECOV_TOKEN`` secret.

tools/tox_matrix.py

@@ -154,11 +154,16 @@ def get_matrix_item(env, global_libraries, global_string_parameters,
     # set pytest_flag
     item["pytest_flag"] = ""
     sep = r"\\" if platform == "windows" else "/"
-    if item["pytest"] == "true" and "codecov" in item.get("coverage", ""):
-        item["pytest_flag"] += (
-            rf"--cov-report=xml:${{GITHUB_WORKSPACE}}{sep}coverage.xml ")
-    if item["pytest"] == "true" and item["pytest-results-summary"] == "true":
-        item["pytest_flag"] += rf"--junitxml ${{GITHUB_WORKSPACE}}{sep}results.xml "
+    if item["pytest"] == "true":
+        if "codecov" in item.get("coverage", ""):
+            item["pytest_flag"] += (
+                rf"--cov --cov-report=xml:${{GITHUB_WORKSPACE}}{sep}coverage.xml "
+            )
+        elif "github" in item.get("coverage", ""):
+            item["pytest_flag"] += "--cov "
+
+        if item["pytest-results-summary"] == "true":
+            item["pytest_flag"] += rf"--junitxml ${{GITHUB_WORKSPACE}}{sep}results.xml "
 
     # set libraries
     env_libraries = env.get("libraries")