Move the setup mehtod body to test method body

Signed-off-by: zane-neo <zaniu@amazon.com>

plugin/src/main/java/org/opensearch/ml/autoredeploy/MLModelAutoReDeployer.java

@@ -217,7 +217,7 @@ private void triggerUndeployModelsOnDataNodes(List<String> dataNodeIds) {
                     client.execute(MLUndeployModelAction.INSTANCE, undeployModelNodesRequest, undeployModelListener);
                 }
             }
-        }, e -> { log.error("Failed to query need undeploy models, no action will be performed"); });
+        }, e -> { log.error("Failed to query need undeploy models, no action will be performed", e); });
         queryRunningModels(listener);
     }
 
@@ -259,6 +259,10 @@ private void queryRunningModels(ActionListener<SearchResponse> listener) {
 
     @SuppressWarnings("unchecked")
     private void triggerModelRedeploy(ModelAutoRedeployArrangement modelAutoRedeployArrangement) {
+        if (modelAutoRedeployArrangement == null) {
+            log.info("No more models in arrangement, skipping the redeployment");
+            return;
+        }
         String modelId = modelAutoRedeployArrangement.getSearchResponse().getId();
         List<String> addedNodes = modelAutoRedeployArrangement.getAddedNodes();
         Map<String, Object> sourceAsMap = modelAutoRedeployArrangement.getSearchResponse().getSourceAsMap();

plugin/src/test/java/org/opensearch/ml/autoredeploy/MLModelAutoReDeployerIT.java

@@ -9,20 +9,17 @@
 
 import static org.opensearch.ml.common.MLTask.MODEL_ID_FIELD;
 
-import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 
-import org.junit.Before;
 import org.opensearch.ml.common.MLTaskState;
 import org.opensearch.ml.rest.MLCommonsRestTestCase;
 
 import lombok.SneakyThrows;
 
 public class MLModelAutoReDeployerIT extends MLCommonsRestTestCase {
 
-    @Before
-    public void setup() throws IOException {
+    public void testModelAutoRedeploy() {
         prepareModel();
     }
 
@@ -65,9 +62,4 @@ private void prepareModel() {
         });
     }
 
-    public void testModelAutoRedeploy() {
-        // This is a tricky IT to test model auto redeploy, since model auto redeploy is not easily to test with IT, so adding this test
-        // to mimic a case when a cluster spin up and immediately deploy a model, the model auto redeployer also selected this deploying
-        // model to deploy, and the original deploy task should complete and the auto redeploy task should fail in background.
-    }
 }