Add header for test

RyanL1997 · RyanL1997 · commit 78ce0e7d8ed2 · 2023-10-02T12:37:38.000-07:00
Signed-off-by: Ryan Liang &lt;jiallian@amazon.com&gt;
diff --git a/src/test/java/org/opensearch/security/authtoken/jwt/AuthTokenUtilsTest.java b/src/test/java/org/opensearch/security/authtoken/jwt/AuthTokenUtilsTest.java
@@ -1,3 +1,14 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
 package org.opensearch.security.authtoken.jwt;
 
 import org.opensearch.common.settings.Settings;
