test: AlertLive sort_alerts impact branch + minor sweep

test/towerops_web/live/alert_live/index_helpers_test.exs

@@ -80,6 +80,31 @@ defmodule ToweropsWeb.AlertLive.IndexHelpersTest do
       assert first.alert_type == "device_down"
       assert is_nil(first.resolved_at)
     end
+
+    test "sort by impact puts highest subscriber count first" do
+      alert_a = %{
+        gaiia_impact: %{"total_subscribers" => 5},
+        device: %{site_id: "s1"},
+        alert_type: "x",
+        resolved_at: nil,
+        triggered_at: ago(1)
+      }
+
+      alert_b = %{
+        gaiia_impact: %{"total_subscribers" => 100},
+        device: %{site_id: "s2"},
+        alert_type: "x",
+        resolved_at: nil,
+        triggered_at: ago(1)
+      }
+
+      alert_c = %{gaiia_impact: nil, device: %{site_id: "s1"}, alert_type: "x", resolved_at: nil, triggered_at: ago(1)}
+
+      [first, second, third] = Index.sort_alerts([alert_a, alert_b, alert_c], "impact", %{})
+      assert first.gaiia_impact["total_subscribers"] == 100
+      assert second.gaiia_impact["total_subscribers"] == 5
+      assert is_nil(third.gaiia_impact)
+    end
   end
 
   describe "get_site_subscriber_count/1" do