Formatting, rename, add mypy

.github/workflows/python-app.yml

@@ -1,7 +1,4 @@
-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
-
-name: Python application
+name: Run tests
 
 on:
   push:
@@ -18,20 +15,28 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
+
       - name: Set up Python 3.10
         uses: actions/setup-python@v3
         with:
           python-version: "3.10"
+
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
           python -m pip install . --no-deps
           python -m pip install -r requirements.txt
           python -m pip install -r requirements-dev.txt
+
       - name: Run pre-commit
         uses: pre-commit/[email protected]
         with:
           extra_args: --all-files --verbose --show-diff-on-failure
+
       - name: Test with pytest
         run: |
           pytest -vv
+
+      - name: Run mypy
+        run: |
+          mypy src/fontra/ test-py/