Refactor doc

.github/workflows/build.yml

@@ -17,11 +17,11 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest'] #, 'macos-latest'] #, 'windows-latest']
-        python-version: ['3.11'] # '3.10', '3.11', '3.12']
+        python-version: ['3.9'] # '3.10', '3.11', '3.12']
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
       - name: Python info
@@ -34,16 +34,28 @@ jobs:
           git config --global url."https://${{ secrets.ACCESS_TOKEN }}@github".insteadOf https://github
           python -m pip install --upgrade pip setuptools
           python -m pip install .[dev,publishing]
+          pip install coveragepy-lcov 'coverage<7' 
       - name: Install EPANET quantum and set environment variables
         run: |
           git clone https://github.com/QuantumApplicationLab/EPANET
           echo "EPANET_TMP=$RUNNER_TEMP" >> $GITHUB_ENV
           echo "EPANET_QUANTUM=${{ github.workspace }}/EPANET" >> $GITHUB_ENV
           echo "$GITHUB_ENV"
-      - name: Run unit tests
-        run: python -m pytest -v
       - name: Verify that we can build the package
         run: python -m build
+      - name: run code coverage
+        run: |
+          coverage3 run --source wntr_quantum --parallel-mode -m pytest -v
+          coverage3 combine
+          coverage3 report
+      - name: Convert to lcov
+        run: coveragepy-lcov --output_file_path coveralls.info
+      - name: Upload report to Coveralls
+        uses: coverallsapp/github-action@v2
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          file: coveralls.info
+          format: lcov
 
   lint:
     name: Linting build
@@ -52,10 +64,10 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@v4
-      - name: Set up Python 3.11
+      - name: Set up Python 3.9
         uses: actions/setup-python@v5
         with:
-          python-version: 3.11
+          python-version: 3.9
       - name: Python info
         shell: bash -e {0}
         run: |