maoling commented on a change in pull request #1106: ZOOKEEPER-1416 - 
Persistent, recursive watchers
URL: https://github.com/apache/zookeeper/pull/1106#discussion_r341837830
 
 

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 File path: 
zookeeper-server/src/test/java/org/apache/zookeeper/server/watch/PathParentIteratorTest.java
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 @@ -0,0 +1,84 @@
+/**
+ * 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.zookeeper.server.watch;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PathParentIteratorTest {
+    @Test
+    public void testRoot() {
+        PathParentIterator pathParentIterator = PathParentIterator.forAll("/");
+        Assert.assertTrue(pathParentIterator.hasNext());
+        Assert.assertFalse(pathParentIterator.atParentPath());
+        Assert.assertEquals(pathParentIterator.next(), "/");
+        Assert.assertFalse(pathParentIterator.hasNext());
+    }
+
+    @Test
+    public void test1Level() {
+        PathParentIterator pathParentIterator = 
PathParentIterator.forAll("/a");
 
 Review comment:
   -  Changing `test1Level` to `testOneLevel`, `testLong` to `testMultiLevels` 
is better?
   - We also need to assert the behaviour when the incoming parameter  is "" or 
null, even if the path may have been validated in the upstream?

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