add failing test

app/demo_test.py

@@ -35,3 +35,6 @@ class TestGetHello(unittest.TestCase):
         response = client.get("/hello", params={"name": "Bernd"})
         self.assertEqual(response.status_code, 200)
         self.assertEqual(response.json(), "Bye.")
+
+    def test_fail(self) -> None:
+        self.assertTrue(False)