[Refactor] Remove bloat due to unnecessary setup in test and add retry for potential flaky behavior due to timeout (opensearch-project#3259)

* refactor: add retries and remove bloat

Signed-off-by: Pavan Yekbote <[email protected]>

* fix: adding return for valid inputs to prevent multiple runs

Signed-off-by: Pavan Yekbote <[email protected]>

---------

Signed-off-by: Pavan Yekbote <[email protected]>

Author: pyek-bot

plugin/src/test/java/org/opensearch/ml/action/models/GetModelITTests.java

@@ -5,38 +5,48 @@
 
 package org.opensearch.ml.action.models;
 
-import org.junit.Before;
-import org.junit.Ignore;
-import org.junit.Rule;
-import org.junit.rules.ExpectedException;
+import org.opensearch.OpenSearchTimeoutException;
 import org.opensearch.action.ActionRequestValidationException;
 import org.opensearch.ml.action.MLCommonsIntegTestCase;
-import org.opensearch.ml.common.MLModel;
 import org.opensearch.ml.common.exception.MLResourceNotFoundException;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
 @OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.SUITE, numDataNodes = 2)
 public class GetModelITTests extends MLCommonsIntegTestCase {
-    private String irisIndexName;
 
-    @Rule
-    public ExpectedException exceptionRule = ExpectedException.none();
+    private static final int MAX_RETRIES = 3;
 
-    @Before
-    public void setUp() throws Exception {
-        super.setUp();
-        irisIndexName = "iris_data_for_model_it";
-        loadIrisData(irisIndexName);
-    }
-
-    @Ignore
     public void testGetModel_IndexNotFound() {
-        exceptionRule.expect(MLResourceNotFoundException.class);
-        MLModel model = getModel("test_id");
+        testGetModelExceptionsWithRetry(MLResourceNotFoundException.class, "test_id");
     }
 
     public void testGetModel_NullModelIdException() {
-        exceptionRule.expect(ActionRequestValidationException.class);
-        MLModel model = getModel(null);
+        testGetModelExceptionsWithRetry(ActionRequestValidationException.class, null);
+    }
+
+    private void testGetModelExceptionsWithRetry(Class<? extends Exception> expectedException, String modelId) {
+        assertThrows(expectedException, () -> {
+            for (int retryAttempt = 1; retryAttempt <= MAX_RETRIES; retryAttempt++) {
+                try {
+                    getModel(modelId);
+                    return;
+                } catch (OpenSearchTimeoutException e) {
+                    logger.info("GetModelITTests attempt: {}", retryAttempt);
+
+                    if (retryAttempt == MAX_RETRIES) {
+                        logger.error("Failed to execute test GetModelITTests after {} retries due to timeout", MAX_RETRIES);
+                        throw e;
+                    }
+
+                    // adding small delay between retries
+                    try {
+                        Thread.sleep(1000);
+                    } catch (InterruptedException ie) {
+                        Thread.currentThread().interrupt();
+                        throw new RuntimeException("Thread was interrupted during retry", ie);
+                    }
+                }
+            }
+        });
     }
 }