hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/TestNameNodeConfiguration.java

/**
 * 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.hadoop.hdfs.server.namenode;

import org.junit.Test;

import java.util.HashSet;
import java.util.Set;

import static org.junit.Assert.assertTrue;

public class TestNameNodeConfiguration {

  /**
   * Detect duplicate keys in {@link NameNode#NAMENODE_SPECIFIC_KEYS}.
   */
  @Test
  public void testNameNodeSpecificKeys() {
    Set<String> keySet = new HashSet<>();
    for (String key : NameNode.NAMENODE_SPECIFIC_KEYS) {
      assertTrue("Duplicate key: " + key
          + " in NameNode.NAMENODE_SPECIFIC_KEYS.", keySet.add(key));
    }
  }
}