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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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.sidecar.testing;
  
  import java.net.UnknownHostException;
  
  import org.junit.jupiter.api.BeforeEach;
  import org.junit.jupiter.api.Test;
  
  import org.apache.cassandra.sidecar.common.server.dns.DnsResolver;
  
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  class LocalhostResolverTest
  {
      DnsResolver mockResolver;
  
      @BeforeEach
      void before() throws UnknownHostException
      {
          mockResolver = mock(DnsResolver.class);
          when(mockResolver.resolve("127.0.0.2")).thenReturn("127.0.0.2");
          when(mockResolver.reverseResolve("localhost20")).thenReturn("localhost20");
      }
  
      @Test
      void testResolve() throws UnknownHostException
      {
          LocalhostResolver resolver = new LocalhostResolver(mockResolver);
          assertThat(resolver.resolve("localhost")).isEqualTo("127.0.0.1");
          assertThat(resolver.resolve("localhost2")).isEqualTo("127.0.0.2");
          assertThat(resolver.resolve("localhost20")).isEqualTo("127.0.0.20");
          assertThat(resolver.resolve("127.0.0.2")).isEqualTo("127.0.0.2");
      }
  
      @Test
      void testReverseResolve() throws UnknownHostException
      {
          LocalhostResolver resolver = new LocalhostResolver(mockResolver);
          assertThat(resolver.reverseResolve("127.0.0.1")).isEqualTo("localhost");
          assertThat(resolver.reverseResolve("127.0.0.2")).isEqualTo("localhost2");
          assertThat(resolver.reverseResolve("127.0.0.20")).isEqualTo("localhost20");
          assertThat(resolver.reverseResolve("localhost20")).isEqualTo("localhost20");
      }
  }
  