[Tests] Enable mypy (#300)

The CI now runs mypy on the tests folder to detect typing errors.

Author: odesenfans

.github/workflows/pyaleph-ci.yml

@@ -53,6 +53,9 @@ jobs:
     - name: Check types
       run: |
         mypy src/
+    - name: Check types in tests
+      run: |
+        mypy tests/
     - name: Run unit tests
       run: |
         pytest -v .

mypy.ini

@@ -5,6 +5,8 @@ python_version = 3.8
 
 mypy_path = src
 
+exclude = conftest.py
+
 
 show_column_numbers = True