TestMetricsZooKeeperSourceImpl.java example

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/**
 * 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.hbase.zookeeper;

import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

import org.apache.hadoop.hbase.CompatibilitySingletonFactory;
import org.apache.hadoop.hbase.testclassification.MetricsTests;
import org.apache.hadoop.hbase.testclassification.SmallTests;
import org.junit.Test;
import org.junit.experimental.categories.Category;

@Category({MetricsTests.class, SmallTests.class})
public class TestMetricsZooKeeperSourceImpl {

  @Test
  public void testGetInstance() throws Exception {
    MetricsZooKeeperSource zkSource = CompatibilitySingletonFactory.getInstance(MetricsZooKeeperSource.class);
    assertTrue(zkSource instanceof MetricsZooKeeperSourceImpl);
    assertSame(zkSource, CompatibilitySingletonFactory.getInstance(MetricsZooKeeperSource.class));
  }
}