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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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
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  package org.apache.hc.client5.http.impl.cache;
  
  import java.util.LinkedList;
  import java.util.Queue;
  
  import org.apache.hc.client5.http.cache.HttpCacheEntry;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.api.Test;
  
  public class TestInternalCacheStorage {
  
      @Test
      public void testCacheBasics() {
          final InternalCacheStorage storage = new InternalCacheStorage();
          final String key1 = "some-key-1";
          Assertions.assertNull(storage.get(key1));
          Assertions.assertNull(storage.remove(key1));
          final HttpCacheEntry entry1 = HttpTestUtils.makeCacheEntry();
          storage.put(key1, entry1);
          Assertions.assertSame(entry1, storage.get(key1));
          Assertions.assertSame(entry1, storage.remove(key1));
          Assertions.assertNull(storage.get(key1));
          Assertions.assertNull(storage.remove(key1));
          final String key2 = "some-key-2";
          final HttpCacheEntry entry2 = HttpTestUtils.makeCacheEntry();
          final String key3 = "some-key-3";
          final HttpCacheEntry entry3 = HttpTestUtils.makeCacheEntry();
          storage.put(key2, entry2);
          storage.put(key3, entry3);
          Assertions.assertSame(entry2, storage.get(key2));
          Assertions.assertSame(entry3, storage.get(key3));
          storage.clear();
          Assertions.assertNull(storage.get(key2));
          Assertions.assertNull(storage.get(key3));
      }
  
      @Test
      public void testCacheEviction() {
          final Queue<HttpCacheEntry> evictedEntries = new LinkedList<>();
          final InternalCacheStorage storage = new InternalCacheStorage(2, e -> evictedEntries.add(e.getContent()));
          final String key1 = "some-key-1";
          final String key2 = "some-key-2";
          final String key3 = "some-key-3";
          final String key4 = "some-key-4";
          final HttpCacheEntry entry1 = HttpTestUtils.makeCacheEntry();
          final HttpCacheEntry entry2 = HttpTestUtils.makeCacheEntry();
          final HttpCacheEntry entry3 = HttpTestUtils.makeCacheEntry();
          final HttpCacheEntry entry4 = HttpTestUtils.makeCacheEntry();
  
          storage.put(key1, entry1);
          storage.put(key2, entry2);
          storage.put(key3, entry3);
          storage.put(key4, entry4);
          Assertions.assertSame(entry1, evictedEntries.poll());
          Assertions.assertSame(entry2, evictedEntries.poll());
          Assertions.assertNull(evictedEntries.poll());
  
          storage.clear();
          storage.put(key1, entry1);
          storage.put(key2, entry2);
          storage.get(key1);
          storage.put(key3, entry3);
          storage.get(key1);
          storage.put(key4, entry4);
  
          Assertions.assertSame(entry2, evictedEntries.poll());
          Assertions.assertSame(entry3, evictedEntries.poll());
          Assertions.assertNull(evictedEntries.poll());
      }
  
  }