content: /*
   * 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 com.alibaba.metrics;
  
  import org.junit.Before;
  import org.junit.Test;
  
  import static org.assertj.core.api.Assertions.assertThat;
  
  public class SharedMetricRegistriesTest {
      @Before
      public void setUp() throws Exception {
          SharedMetricRegistries.clear();
      }
  
      @Test
      public void memoizesRegistriesByName() throws Exception {
          final MetricRegistry one = SharedMetricRegistries.getOrCreate("one");
          final MetricRegistry two = SharedMetricRegistries.getOrCreate("one");
  
          assertThat(one)
                  .isSameAs(two);
      }
  
      @Test
      public void hasASetOfNames() throws Exception {
          SharedMetricRegistries.getOrCreate("one");
  
          assertThat(SharedMetricRegistries.names())
                  .containsOnly("one");
      }
  
      @Test
      public void removesRegistries() throws Exception {
          final MetricRegistry one = SharedMetricRegistries.getOrCreate("one");
          SharedMetricRegistries.remove("one");
  
          assertThat(SharedMetricRegistries.names())
                  .isEmpty();
  
          final MetricRegistry two = SharedMetricRegistries.getOrCreate("one");
          assertThat(two)
                  .isNotSameAs(one);
      }
  
      @Test
      public void clearsRegistries() throws Exception {
          SharedMetricRegistries.getOrCreate("one");
          SharedMetricRegistries.getOrCreate("two");
  
          SharedMetricRegistries.clear();
  
          assertThat(SharedMetricRegistries.names())
                  .isEmpty();
      }
  }
  