add

.github/workflows/tests.yaml

@@ -19,11 +19,24 @@ jobs:
         with:
           python-version: 3.7
 
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          virtualenvs-create: true
+          virtualenvs-in-project: true
+          installer-parallel: true
+
+      - name: Install ExCore
+        run: poetry install --no-interaction --with dev
+
       - name: Run pytest
         run: |
-          pip install poetry
-          poetry install --with dev
           cd tests
           pip install toml
           python init.py
           python -m pytest
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v3
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}