add tests

Author: lobsterkatie

tests/sentry/event_manager/test_event_manager.py

@@ -2641,6 +2641,36 @@ def test_severity_score_flag_off(self, mock_get_severity_score: MagicMock):
             mock_get_severity_score.assert_not_called()
             assert event.group and "severity" not in event.group.get_event_metadata()
 
+    @patch("sentry.event_manager._get_severity_score", return_value=None)
+    def test_no_severity_score_assigned_when_value_is_None(
+        self, mock_get_severity_score: MagicMock
+    ):
+        with self.feature({"projects:first-event-severity-calculation": True}):
+            manager = EventManager(
+                make_event(
+                    exception={"values": [{"type": "NopeError", "value": "Nopey McNopeface"}]}
+                )
+            )
+            event = manager.save(self.project.id)
+
+            mock_get_severity_score.assert_called()
+            assert event.group and "severity" not in event.group.get_event_metadata()
+
+    @patch("sentry.event_manager._get_severity_score", return_value=0)
+    def test_severity_score_still_assigned_when_value_is_zero(
+        self, mock_get_severity_score: MagicMock
+    ):
+        with self.feature({"projects:first-event-severity-calculation": True}):
+            manager = EventManager(
+                make_event(
+                    exception={"values": [{"type": "NopeError", "value": "Nopey McNopeface"}]}
+                )
+            )
+            event = manager.save(self.project.id)
+
+            mock_get_severity_score.assert_called()
+            assert event.group and event.group.get_event_metadata().get("severity") == 0
+
 
 class AutoAssociateCommitTest(TestCase, EventManagerTestMixin):
     def setUp(self):