Add coverage report in CI

Author: zerolab

.github/workflows/test.yml

@@ -16,6 +16,10 @@ permissions:
   contents: read # to fetch code (actions/checkout)
 
 env:
+  FORCE_COLOR: "1" # Make tools pretty.
+  TOX_TESTENV_PASSENV: FORCE_COLOR
+  PIP_DISABLE_PIP_VERSION_CHECK: "1"
+  PIP_NO_PYTHON_VERSION_WARNING: "1"
   PYTHON_LATEST: "3.11"
 
 
@@ -32,7 +36,7 @@ jobs:
           python-version: ${{env.PYTHON_LATEST}}
       - uses: pre-commit/[email protected]
 
-  test:
+  tests:
     runs-on: ubuntu-latest
     needs: lint
     strategy:
@@ -41,17 +45,56 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Setup Python ${{ matrix.python }}
+      - name: 🐍 Setup Python ${{ matrix.python }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python }}
-      - name: Install dependencies
+      - name: 📦 Install dependencies
         run: |
-          python -Im pip install --upgrade pip
           python -Im pip install tox tox-gh-actions wheel
 
       - name: 🏗️ Build wheel
         run: python setup.py bdist_wheel
 
       - name: 🧪 Run tox targets for Python ${{ matrix.python-version }}
         run: tox --installpkg ./dist/*.whl
+
+      - name: ⬆️ Upload coverage data
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-data
+          path: .coverage.*
+          if-no-files-found: ignore
+          retention-days: 1
+
+  coverage:
+    runs-on: ubuntu-latest
+    needs: tests
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v4
+        with:
+          # Use latest Python, so it understands all syntax.
+          python-version: ${{env.PYTHON_LATEST}}
+
+      - run: python -Im pip install --upgrade "coverage[toml]>=7.2,<8.0"
+
+      - name: ⬇️ Download coverage data
+        uses: actions/download-artifact@v3
+        with:
+          name: coverage-data
+
+      - name: ＋  Combine coverage
+        run: |
+          python -Im coverage combine
+          python -Im coverage html --skip-covered --skip-empty
+          python -Im coverage report
+          echo "## Coverage summary" >> $GITHUB_STEP_SUMMARY
+          python -Im coverage report --format=markdown >> $GITHUB_STEP_SUMMARY
+      - name: 📈 Upload HTML report if check failed.
+        uses: actions/upload-artifact@v3
+        with:
+          name: html-report
+          path: htmlcov