rewrite tests CI

.github/workflows/tests.yml

@@ -0,0 +1,37 @@
+name: tests
+
+on: push
+
+jobs:
+  test:
+    name: Run tests
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ['3.10', '3.11', '3.12']
+
+    steps:
+    - name: Check out code 
+      uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Display Python version
+      run: python -c "import sys; print(sys.version)"
+
+    - name: Install test dependencies        
+      run: |
+        pip install setuptools --upgrade
+        pip install .[test]
+
+    - name: Install package
+      run: pip install .    
+
+    - name: Run unit tests
+      run: |
+        mkdir -p test-reports
+        py.test -v --junitxml=test-reports/junit.xml frank/tests.py