Update common_test.go
diff --git a/pkg/tlsutil/common_test.go b/pkg/tlsutil/common_test.go
index 7378922..76f9f80 100644
--- a/pkg/tlsutil/common_test.go
+++ b/pkg/tlsutil/common_test.go
@@ -1,3 +1,18 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License. You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
package tlsutil
import "testing"
