diff --git a/src/webmon_app/reporting/tests/test_dasmon/test_view_util.py b/src/webmon_app/reporting/tests/test_dasmon/test_view_util.py
index 3d503812..409341b7 100644
--- a/src/webmon_app/reporting/tests/test_dasmon/test_view_util.py
+++ b/src/webmon_app/reporting/tests/test_dasmon/test_view_util.py
@@ -8,7 +8,7 @@
 from django.contrib.auth.models import Group
 from django.utils import timezone
 
-from reporting.report.models import Instrument
+from reporting.report.models import Instrument, Information, RunStatus, StatusQueue
 from reporting.dasmon.models import ActiveInstrument, Parameter, StatusCache, StatusVariable, Signal
 from workflow.database.report.models import DataRun
 from workflow.database.report.models import IPTS
@@ -446,14 +446,58 @@ def test_workflow_diagnostics(self):
     def test_postprocessing_diagnostics(self):
         from reporting.dasmon.view_util import postprocessing_diagnostics
 
+        # add postprocessing services
+        common = Instrument.objects.get(name="common")
+        name_postprocessor = settings.SYSTEM_STATUS_PREFIX + "autoreducer4.com"
+        para_postprocessor = Parameter.objects.create(name=name_postprocessor)
+        para_postprocessor.save()
+        StatusCache.objects.create(
+            instrument_id=common,
+            key_id=para_postprocessor,
+            value=0,
+            timestamp=timezone.now(),
+        )
+        para_postprocessor_pid = Parameter.objects.create(name=name_postprocessor + "_pid")
+        para_postprocessor_pid.save()
+        StatusCache.objects.create(
+            instrument_id=common,
+            key_id=para_postprocessor_pid,
+            value=7,
+            timestamp=timezone.now(),
+        )
+
+        # create StatusQueue, DataRun, RunStatus and Information needed for test
+        inst = Instrument.objects.get(name="testinst")
+        queue = StatusQueue(name="REDUCTION.COMPLETE")
+        queue.save()
+        ipts = IPTS(expt_name="IPTS-42")
+        ipts.save()
+        dataRun = DataRun(run_number=42, ipts_id=ipts, instrument_id=inst, file="/filename")
+        dataRun.save()
+        runStatus = RunStatus(run_id=dataRun, queue_id=queue)
+        runStatus.save()
+        info = Information(run_status_id=runStatus, description="autoreducer4.com")
+        info.save()
+
         red_diag = postprocessing_diagnostics()
         # NOTE: we don't have any postprocessing data during testing, so only
         #       test the entry that does exist
         assert red_diag["catalog_status"] == 0
         assert red_diag["reduction_status"] == 0
-        assert len(red_diag["ar_nodes"]) == 0
         assert len(red_diag["conditions"]) == 0
 
+        # for nodes we have data to check
+        assert len(red_diag["ar_nodes"]) == 3
+        for i in range(3):
+            assert "time" in red_diag["ar_nodes"][i]
+            assert red_diag["ar_nodes"][i]["node"] == "autoreducer4.com"
+
+        msgs = [node["msg"] for node in red_diag["ar_nodes"] if "msg" in node]
+        print(msgs)
+        assert len(msgs) == 2
+        assert "PID: 7" in msgs
+        assert "Last msg: testinst_42: REDUCTION.COMPLETE" in msgs
+
     def test_pvstreamer_diagnostics(self):
         from reporting.dasmon.view_util import pvstreamer_diagnostics