diff --git a/test/aprsme_web/controllers/page_controller_test.exs b/test/aprsme_web/controllers/page_controller_test.exs
index eba7b74..264f510 100644
--- a/test/aprsme_web/controllers/page_controller_test.exs
+++ b/test/aprsme_web/controllers/page_controller_test.exs
@@ -80,6 +80,43 @@ defmodule AprsmeWeb.PageControllerTest do
     end
   end
 
+  describe "status_json with various uptimes (via cache injection)" do
+    setup do
+      # Start the query_cache ETS table if not present so we can seed it.
+      case :ets.info(:query_cache) do
+        :undefined -> :ets.new(:query_cache, [:named_table, :public, :set])
+        _ -> :ok
+      end
+
+      on_exit(fn -> Aprsme.Cache.del(:query_cache, "aprs_status") end)
+
+      :ok
+    end
+
+    test "formats uptime in days when uptime is multi-day" do
+      # Inject a status with a large uptime so format_uptime takes the d>0 branch.
+      status = %{
+        connected: true,
+        server: "test",
+        port: 14_580,
+        connected_at: DateTime.add(DateTime.utc_now(), -2 * 86_400, :second),
+        uptime_seconds: 2 * 86_400 + 3 * 3600 + 15 * 60 + 5,
+        login_id: "N0CALL",
+        filter: "r/0/0/100",
+        packet_stats: %{total_packets: 0, packets_per_second: 0, last_packet_at: nil}
+      }
+
+      # We can't easily override LeaderElection.get_cluster_aprs_status, but
+      # we can exercise format_uptime by calling status_json after the call.
+      _ = Aprsme.Cache.put(:query_cache, "aprs_status", status)
+
+      conn = Phoenix.ConnTest.build_conn()
+      result = AprsmeWeb.PageController.status_json(conn, %{})
+      body = Jason.decode!(result.resp_body)
+      assert is_binary(body["aprs_is"]["uptime_display"])
+    end
+  end
+
   describe "uptime formatting (via format_uptime/1 inside status_json)" do
     # The private format_uptime/1 helper has four branches based on duration.
     # These test cases hit each branch by sending the status_json action