added test rule to Makefile

Author: ChrisTimperley

Makefile

@@ -11,7 +11,7 @@ lint:
 test:
 	poetry run pytest tests
 
-check: lint
+check: lint test
 
 clean:
 	rm -rf .pytest_cache

tests/test_example.py

@@ -0,0 +1,9 @@
+from project_name.example import double, triple
+
+
+def test_double() -> None:
+    assert double(2) == 4
+
+
+def test_triple() -> None:
+    assert triple(3) == 9