add test to check if error output healthcheck is added to exporter

tests/unit/framework/test_pipeline_manager.py

@@ -195,6 +195,19 @@ def test_restart_failed_pipelines_sets_old_pipeline_index(self):
             pipeline_manager.restart_failed_pipeline()
             mock_create_pipeline.assert_called_once_with(1)
 
+    def test_restart_failed_pipeline_adds_error_output_health_check_to_metrics_exporter(
+        self, tmp_path
+    ):
+        with mock.patch("logprep.framework.pipeline_manager.OutputQueueListener"):
+            with mock.patch("logprep.framework.pipeline_manager.ThrottlingQueue"):
+                config = deepcopy(self.config)
+                config.error_output = {"dummy": {"type": "dummy_output"}}
+                pipeline_manager = PipelineManager(config)
+                mock_export = mock.MagicMock()
+                pipeline_manager.prometheus_exporter = mock_export
+                pipeline_manager.restart()
+                mock_export.update_healthchecks.assert_called()
+
     def test_pipeline_manager_sets_queue_size_for_http_input(self):
         config = deepcopy(self.config)
         config.input = {