Add Tests

Makefile

@@ -30,4 +30,15 @@ serve :
 shell :
 	poetry run flask shell
 
-.PHONY : lint shell serve
+test :
+	poetry run python -m pytest tests
+
+test-x :
+	poetry run python -m pytest tests -x
+
+test-wip :
+	poetry run python -m pytest tests -m wip
+
+.PHONY : db-init db-migrate db-upgrad db-downgrade \
+	lint shell serve \
+	test test-wip test-x