diff --git a/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java b/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
index 11cb934a94..90df8433aa 100644
--- a/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
+++ b/src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java
@@ -1961,9 +1961,10 @@ public void stop() {}
 
     }
 
-    public static void setClusterService (ClusterService clusterService) {
+    public static void setClusterService(ClusterService clusterService) {
         cs = clusterService;
     }
+
     public static ClusterService getClusterNameString() {
         return cs;
     }
diff --git a/src/main/java/org/opensearch/security/securityconf/DynamicConfigModelV7.java b/src/main/java/org/opensearch/security/securityconf/DynamicConfigModelV7.java
index b47f9cdd13..bce800c811 100644
--- a/src/main/java/org/opensearch/security/securityconf/DynamicConfigModelV7.java
+++ b/src/main/java/org/opensearch/security/securityconf/DynamicConfigModelV7.java
@@ -83,12 +83,7 @@ public class DynamicConfigModelV7 extends DynamicConfigModel {
     private List<ClientBlockRegistry<InetAddress>> ipClientBlockRegistries;
     private Multimap<String, ClientBlockRegistry<String>> authBackendClientBlockRegistries;
 
-    public DynamicConfigModelV7(
-        ConfigV7 config,
-        Settings opensearchSettings,
-        Path configPath,
-        InternalAuthenticationBackend iab
-    ) {
+    public DynamicConfigModelV7(ConfigV7 config, Settings opensearchSettings, Path configPath, InternalAuthenticationBackend iab) {
         super();
         this.config = config;
         this.opensearchSettings = opensearchSettings;
diff --git a/src/test/java/org/opensearch/security/http/OnBehalfOfAuthenticatorTest.java b/src/test/java/org/opensearch/security/http/OnBehalfOfAuthenticatorTest.java
index 7459d1ebbe..b3b1ef1a81 100644
--- a/src/test/java/org/opensearch/security/http/OnBehalfOfAuthenticatorTest.java
+++ b/src/test/java/org/opensearch/security/http/OnBehalfOfAuthenticatorTest.java
@@ -27,13 +27,21 @@
 import io.jsonwebtoken.security.Keys;
 import org.apache.commons.lang3.RandomStringUtils;
 import org.apache.hc.core5.http.HttpHeaders;
+import org.junit.After;
 import org.junit.Assert;
+import org.junit.Before;
 import org.junit.Test;
 
+import org.opensearch.cluster.ClusterName;
+import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.settings.Settings;
+import org.opensearch.security.OpenSearchSecurityPlugin;
 import org.opensearch.security.user.AuthCredentials;
 import org.opensearch.security.util.FakeRestRequest;
 
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
 public class OnBehalfOfAuthenticatorTest {
     final static String clusterNameString = "cluster_0";
     final static String enableOBO = "true";
@@ -45,6 +53,20 @@ public class OnBehalfOfAuthenticatorTest {
     final static String signingKeyB64Encoded = BaseEncoding.base64().encode(signingKey.getBytes(StandardCharsets.UTF_8));
     final static SecretKey secretKey = Keys.hmacShaKeyFor(signingKeyB64Encoded.getBytes(StandardCharsets.UTF_8));
 
+    @Before
+    public void setupMocks() {
+        ClusterService mockedClusterService = mock(ClusterService.class);
+        ClusterName mockedClusterName = new ClusterName(clusterNameString);
+        when(mockedClusterService.getClusterName()).thenReturn(mockedClusterName);
+
+        OpenSearchSecurityPlugin.setClusterService(mockedClusterService);
+    }
+
+    @After
+    public void tearDown() {
+        OpenSearchSecurityPlugin.setClusterService(null);
+    }
+
     @Test
     public void testNoKey() throws Exception {