diff --git a/tests/shared/test_effects.py b/tests/shared/test_effects.py
index 2837296..1e00d2d 100644
--- a/tests/shared/test_effects.py
+++ b/tests/shared/test_effects.py
@@ -19,7 +19,9 @@ def test_dev_stage_disables_effects(monkeypatch):
 
 def test_dev_slack_token_does_not_read_secrets(monkeypatch):
     monkeypatch.setenv("STAGE", "dev")
-    monkeypatch.setenv("SLACK_BOT_TOKEN_SECRET", "afterhours-shift-manager/slack-bot-token")
+    monkeypatch.setenv(
+        "SLACK_BOT_TOKEN_SECRET", "afterhours-shift-manager/slack-bot-token"
+    )
     read = MagicMock(side_effect=AssertionError("secret read"))
     monkeypatch.setattr("shared.side_effects.get_secret", read)
     assert slack_token() is None