Add CI tests workflow

Author: FraLotito

.github/workflows/tests.yml

@@ -0,0 +1,48 @@
+name: Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.10", "3.11", "3.12"]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set Up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+
+      - name: Upgrade pip
+        run: python -m pip install --upgrade pip
+
+      - name: Ensure Clean Environment (No Preinstalled hypergraphx)
+        run: |
+          python -m pip uninstall -y hypergraphx || true
+          if python -m pip show hypergraphx >/dev/null 2>&1; then
+            echo "hypergraphx is unexpectedly installed before test setup."
+            python -m pip show hypergraphx
+            exit 1
+          fi
+
+      - name: Install
+        run: |
+          python -m pip install -e ".[dev]"
+          python -m pip install matplotlib
+
+      - name: Pytest
+        run: pytest
+