Run black in CI

.github/workflows/run-tests.yml

@@ -28,7 +28,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 mypy pytest
+        python -m pip install flake8 mypy pytest black colorama
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
 
     - name: Run tests with pytest
@@ -42,3 +42,7 @@ jobs:
     - name: Run mypy
       run: |
         python -m mypy --strict simple_pid
+
+    - name: Run black
+      run: |
+        python -m black -l 100 -S --check --diff --color --exclude "docs/" .

tests/test_pid.py

@@ -121,6 +121,7 @@ def time_function():
         nonlocal i
         i += 1
         return i
+
     pid.time_fn = time_function
 
     for j in range(1, 5):