QPID-7639: Add missing license header
diff --git a/broker-core/src/test/java/org/apache/qpid/server/txn/FlowToDiskMessageObserverTest.java b/broker-core/src/test/java/org/apache/qpid/server/txn/FlowToDiskMessageObserverTest.java
index b402e9c..a596103 100644
--- a/broker-core/src/test/java/org/apache/qpid/server/txn/FlowToDiskMessageObserverTest.java
+++ b/broker-core/src/test/java/org/apache/qpid/server/txn/FlowToDiskMessageObserverTest.java
@@ -1,3 +1,23 @@
+/*
+ *
+ * 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 org.apache.qpid.server.txn;
import static org.mockito.Matchers.any;
