diff --git a/tests/unit/fixtures/dummy_backend.py b/tests/unit/fixtures/dummy_backend.py
index 3d213b75..ffb8fc39 100644
--- a/tests/unit/fixtures/dummy_backend.py
+++ b/tests/unit/fixtures/dummy_backend.py
@@ -6,9 +6,9 @@
 
 class DummyBackend:
     def __init__(self, client=None, **config):
-        self.good_events = config.get("good_events", None)
-        self.bad_events = config.get("bad_events", None)
-        self.sli_value = config.get("sli", None)
+        self.good_events = config.get("good_events")
+        self.bad_events = config.get("bad_events")
+        self.sli_value = config.get("sli")
 
     def good_bad_ratio(self, timestamp, window, slo_config):
         return (self.good_events, self.bad_events)