/**
    * 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.ipc;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertThat;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.net.Address;
  import org.apache.hadoop.hbase.testclassification.ClientTests;
  import org.apache.hadoop.hbase.testclassification.SmallTests;
  import org.apache.log4j.Appender;
  import org.apache.log4j.Level;
  import org.apache.log4j.LogManager;
  import org.apache.log4j.spi.LoggingEvent;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.mockito.ArgumentCaptor;
  import org.mockito.Captor;
  import org.mockito.Mock;
  import org.mockito.Mockito;
  import org.mockito.runners.MockitoJUnitRunner;
  
  @RunWith(MockitoJUnitRunner.class)
  @Category({ ClientTests.class, SmallTests.class })
  public class TestFailedServersLog {
    static final int TEST_PORT = 9999;
    private Address addr;
  
    @Mock
    private Appender mockAppender;
  
    @Captor
    private ArgumentCaptor captorLoggingEvent;
  
    @Before
    public void setup() {
      LogManager.getRootLogger().addAppender(mockAppender);
    }
  
    @After
    public void teardown() {
      LogManager.getRootLogger().removeAppender(mockAppender);
    }
  
    @Test
    public void testAddToFailedServersLogging() {
      Throwable nullException = new NullPointerException();
  
      FailedServers fs = new FailedServers(new Configuration());
      addr = Address.fromParts("localhost", TEST_PORT);
  
      fs.addToFailedServers(addr, nullException);
  
      Mockito.verify(mockAppender).doAppend((LoggingEvent) captorLoggingEvent.capture());
      LoggingEvent loggingEvent = (LoggingEvent) captorLoggingEvent.getValue();
      assertThat(loggingEvent.getLevel(), is(Level.DEBUG));
      assertEquals("Added failed server with address " + addr + " to list caused by "
          + nullException.toString(),
        loggingEvent.getRenderedMessage());
    }
  
  }