Activate pytest on commit.

.pre-commit-config.yaml

@@ -9,3 +9,11 @@ repos:
     rev: 6.0.0
     hooks:
       - id: flake8
+
+  - repo: local
+    hooks:
+      - id: pytest
+        name: pytest
+        entry: pytest
+        language: system
+        pass_filenames: false