use tox in github action (#35)

also cache pip

.github/workflows/python-package.yml

@@ -1,7 +1,7 @@
 # This workflow will install Python dependencies, run tests and lint with a variety of Python versions
 # For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions
 
-name: Python package
+name: unit tests
 
 on:
   push:
@@ -16,22 +16,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.8, 3.9, '3.10', 3.11, 3.12]
+        python-version: ["3.8","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
       with:
         python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
-    - name: Lint with flake8
-      run: |
-        # Stop the build if there are any lint errors or warnings
-        flake8 . --count --show-source --max-line-length=127 --statistics
-    - name: Run tests
-      run: |
-        python tests.py
+        cache: pip
+    - name: Install requirements
+      run: pip install -r requirements.txt
+    - name: Run tox
+      run: tox -e py

requirements.txt

@@ -1 +1,2 @@
+tox
 flake8