diff --git a/src/test/java/org/opensearch/security/dlic/rest/api/RolesApiTest.java b/src/test/java/org/opensearch/security/dlic/rest/api/RolesApiTest.java
index fff42682c5..a8001caba2 100644
--- a/src/test/java/org/opensearch/security/dlic/rest/api/RolesApiTest.java
+++ b/src/test/java/org/opensearch/security/dlic/rest/api/RolesApiTest.java
@@ -528,36 +528,37 @@ public void checkNullElementsInArray() throws Exception{
         setup();
         rh.keystore = "restapi/kirk-keystore.jks";
         rh.sendAdminCertificate = true;
+        String expectedMessage = "`null` is not allowed as json array element";
 
         String body = FileHelper.loadFile("restapi/roles_null_array_element_cluster_permissions.json");
         HttpResponse response = rh.executePutRequest(ENDPOINT + "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
 
         body = FileHelper.loadFile("restapi/roles_null_array_element_index_permissions.json");
         response = rh.executePutRequest(ENDPOINT+ "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
 
         body = FileHelper.loadFile("restapi/roles_null_array_element_tenant_permissions.json");
         response = rh.executePutRequest(ENDPOINT + "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
 
         body = FileHelper.loadFile("restapi/roles_null_array_element_index_patterns.json");
         response = rh.executePutRequest(ENDPOINT + "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
 
         body = FileHelper.loadFile("restapi/roles_null_array_element_masked_fields.json");
         response = rh.executePutRequest(ENDPOINT + "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
 
         body = FileHelper.loadFile("restapi/roles_null_array_element_allowed_actions.json");
         response = rh.executePutRequest(ENDPOINT + "/roles/opendistro_security_role_starfleet", body, new Header[0]);
         Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-        Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+        Assert.assertTrue(response.getBody().contains(expectedMessage));
     }
 
 }
diff --git a/src/test/java/org/opensearch/security/dlic/rest/api/RolesMappingApiTest.java b/src/test/java/org/opensearch/security/dlic/rest/api/RolesMappingApiTest.java
index 17a7453070..5909247e00 100644
--- a/src/test/java/org/opensearch/security/dlic/rest/api/RolesMappingApiTest.java
+++ b/src/test/java/org/opensearch/security/dlic/rest/api/RolesMappingApiTest.java
@@ -417,23 +417,24 @@ public void checkNullElementsInArray() throws Exception{
 		setup();
 		rh.keystore = "restapi/kirk-keystore.jks";
 		rh.sendAdminCertificate = true;
+        String expectedMessage = "`null` is not allowed as json array element";
 
 		String body = FileHelper.loadFile("restapi/rolesmapping_null_array_element_users.json");
 		HttpResponse response = rh.executePutRequest(ENDPOINT + "/rolesmapping/opendistro_security_role_starfleet_captains",
 													 body, new Header[0]);
 		Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-		Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+		Assert.assertTrue(response.getBody().contains(expectedMessage));
 
 		body = FileHelper.loadFile("restapi/rolesmapping_null_array_element_backend_roles.json");
 		response = rh.executePutRequest(ENDPOINT + "/rolesmapping/opendistro_security_role_starfleet_captains",
 													 body, new Header[0]);
 		Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-		Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+		Assert.assertTrue(response.getBody().contains(expectedMessage));
 
 		body = FileHelper.loadFile("restapi/rolesmapping_null_array_element_hosts.json");
 		response = rh.executePutRequest(ENDPOINT + "/rolesmapping/opendistro_security_role_starfleet_captains",
 										 body, new Header[0]);
 		Assert.assertEquals(HttpStatus.SC_BAD_REQUEST, response.getStatusCode());
-		Assert.assertTrue(response.getBody().contains("`null` is not allowed as json array element"));
+		Assert.assertTrue(response.getBody().contains(expectedMessage));
 	}
 }