diff --git a/src/test/java/org/opensearch/knn/integ/PainlessScriptFieldsIT.java b/src/test/java/org/opensearch/knn/integ/PainlessScriptFieldsIT.java
index c68ca2a6fb..8f9e1ed298 100644
--- a/src/test/java/org/opensearch/knn/integ/PainlessScriptFieldsIT.java
+++ b/src/test/java/org/opensearch/knn/integ/PainlessScriptFieldsIT.java
@@ -30,7 +30,7 @@
 // it is clear if similarity method is supported by script_score, then same is applicable for script_fields
 // provided script_fields context is supported. Hence, we test for one similarity method to verify that script_fields
 // context is supported by this plugin.
-public class PainlessScriptFieldsIT extends KNNRestTestCase {
+public final class PainlessScriptFieldsIT extends KNNRestTestCase {
 
     private static final String NUMERIC_INDEX_FIELD_NAME = "price";
 
diff --git a/src/test/java/org/opensearch/knn/integ/PainlessScriptHelper.java b/src/test/java/org/opensearch/knn/integ/PainlessScriptHelper.java
index 800f1a1ec0..a5001c7dd5 100644
--- a/src/test/java/org/opensearch/knn/integ/PainlessScriptHelper.java
+++ b/src/test/java/org/opensearch/knn/integ/PainlessScriptHelper.java
@@ -15,8 +15,7 @@
 import java.util.List;
 import java.util.Objects;
 
-public class PainlessScriptHelper {
-
+public final class PainlessScriptHelper {
     /**
      * Utility to create a Index Mapping with multiple fields
      */
@@ -45,7 +44,7 @@ public static String createMapping(List<MappingProperty> properties) throws IOEx
         return xContentBuilder.toString();
     }
 
-    static class MappingProperty {
+    final static class MappingProperty {
 
         private final String name;
         private final String type;
diff --git a/src/test/java/org/opensearch/knn/integ/PainlessScriptScoreIT.java b/src/test/java/org/opensearch/knn/integ/PainlessScriptScoreIT.java
index 03e8f68a25..3f96bac9c9 100644
--- a/src/test/java/org/opensearch/knn/integ/PainlessScriptScoreIT.java
+++ b/src/test/java/org/opensearch/knn/integ/PainlessScriptScoreIT.java
@@ -36,7 +36,7 @@
 import static org.opensearch.knn.common.KNNConstants.METHOD_HNSW;
 import static org.opensearch.knn.integ.PainlessScriptHelper.createMapping;
 
-public class PainlessScriptScoreIT extends KNNRestTestCase {
+public final class PainlessScriptScoreIT extends KNNRestTestCase {
 
     public static final int AGGREGATION_FIELD_NAME_MIN_LENGTH = 2;
     public static final int AGGREGATION_FIELD_NAME_MAX_LENGTH = 5;