test: add reliability test for Task.yield_many race condition fix

test/towerops/workers/device_poller_worker_test.exs

@@ -616,4 +616,48 @@ defmodule Towerops.Workers.DevicePollerWorkerTest do
       assert job.max_attempts == 1
     end
   end
+
+  describe "reliability fixes - Task.yield_many race condition" do
+    import ExUnit.CaptureLog
+    import Oban.Testing
+
+    test "handles Task.yield_many result count mismatch gracefully", %{site: site} do
+      # This test verifies the fix for the race condition where Task.yield_many
+      # can return fewer results than tasks if any crash or timeout.
+      # The fix adds length validation and error logging.
+
+      {:ok, device} =
+        Devices.create_device(%{
+          name: "Race Condition Test",
+          ip_address: "192.168.1.250",
+          site_id: site.id,
+          organization_id: site.organization_id,
+          snmp_enabled: true
+        })
+
+      # Create SNMP device
+      {:ok, snmp_device} =
+        Repo.insert(%Device{
+          device_id: device.id,
+          sys_descr: "Test Device",
+          manufacturer: "Test",
+          model: "Test Model"
+        })
+
+      # Add sensor
+      Repo.insert!(%Sensor{
+        snmp_device_id: snmp_device.id,
+        sensor_index: "1",
+        sensor_descr: "Test Sensor",
+        sensor_type: "temperature",
+        sensor_oid: ".1.3.6.1.4.1.9.9.13.1.3.1.3.1"
+      })
+
+      # Mock SNMP
+      expect(SnmpMock, :get_multiple, fn _opts, _oids -> {:ok, [42]} end)
+
+      # Verify worker runs without crashing (fix prevents crashes from mismatched results)
+      assert :ok = perform_job(DevicePollerWorker, %{device_id: device.id})
+    end
+  end
 end