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.Test;
  
  import javax.management.AttributeNotFoundException;
  import javax.management.MBeanServer;
  import javax.management.ObjectName;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  public class JmxAttributeGaugeTest {
      private final MBeanServer mBeanServer = mock(MBeanServer.class);
      private final ObjectName objectName = mock(ObjectName.class);
      private final JmxAttributeGauge gauge = new JmxAttributeGauge(mBeanServer, objectName, "attr");
      private final Object value = mock(Object.class);
  
      @Test
      public void returnsAJmxAttribute() throws Exception {
          when(mBeanServer.getAttribute(objectName, "attr")).thenReturn(value);
  
          assertThat(gauge.getValue())
                  .isEqualTo(value);
      }
  
      @Test
      public void returnsNullIfThereIsAnException() throws Exception {
          when(mBeanServer.getAttribute(objectName, "attr")).thenThrow(new AttributeNotFoundException());
  
          assertThat(gauge.getValue())
                  .isNull();
      }
  }
  