content: /*
   * Copyright (C) 2019 The Android Open Source Project
   *
   * Licensed 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.google.android.exoplayer2.source.hls;
  
  import static com.google.common.truth.Truth.assertThat;
  import static org.junit.Assert.fail;
  
  import android.net.Uri;
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Tests for {@link FullSegmentEncryptionKeyCache}. */
  @RunWith(AndroidJUnit4.class)
  public class FullSegmentEncryptionKeyCacheTest {
  
    private final Uri firstUri = Uri.parse("https://www.google.com");
    private final Uri secondUri = Uri.parse("https://www.abc.xyz");
    private final byte[] encryptionKey = {5, 6, 7, 8};
  
    @Test
    public void putThenGetAndContains() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      cache.put(firstUri, encryptionKey);
      assertThat(cache.get(firstUri)).isEqualTo(encryptionKey);
      assertThat(cache.get(secondUri)).isNull();
      assertThat(cache.containsUri(firstUri)).isTrue();
      assertThat(cache.containsUri(secondUri)).isFalse();
    }
  
    @Test
    public void getNullReturnsNull() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      cache.put(firstUri, encryptionKey);
      assertThat(cache.get(null)).isNull();
    }
  
    @Test
    public void putNullKeyThrowsException() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      try {
        cache.put(null, encryptionKey);
        fail();
      } catch (NullPointerException expected) {
      }
    }
  
    @Test
    public void putNullValueThrowsException() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      try {
        cache.put(firstUri, null);
        fail();
      } catch (NullPointerException expected) {
      }
    }
  
    @Test
    public void containsNullThrowsException() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      try {
        cache.containsUri(null);
        fail();
      } catch (NullPointerException expected) {
      }
    }
  
    @Test
    public void removeNullThrowsException() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 5);
      try {
        cache.remove(null);
        fail();
      } catch (NullPointerException expected) {
      }
    }
  
    @Test
    public void oldestElementRemoved() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 2);
  
      cache.put(firstUri, encryptionKey);
      cache.put(secondUri, new byte[] {1, 2, 3, 4});
      cache.put(Uri.parse("www.nest.com"), new byte[] {1, 2, 3, 4});
  
      assertThat(cache.containsUri(firstUri)).isFalse();
      assertThat(cache.containsUri(secondUri)).isTrue();
    }
  
    /**
     * Elements need to be removed and reinserted, rather than just updated, to change their position
     * in the removal queue.
     */
    @Test
    public void updatingElementDoesntChangeAgeForRemoval() {
      FullSegmentEncryptionKeyCache cache = new FullSegmentEncryptionKeyCache(/* maxSize= */ 2);
  
      cache.put(firstUri, encryptionKey);
      cache.put(secondUri, new byte[] {1, 2, 3, 4});
      // Update firstUri element
      cache.put(firstUri, new byte[] {10, 11, 12, 12});
      cache.put(Uri.parse("www.nest.com"), new byte[] {1, 2, 3, 4});
  
      // firstUri is still removed before secondUri, despite the update
      assertThat(cache.containsUri(firstUri)).isFalse();
      assertThat(cache.containsUri(secondUri)).isTrue();
    }
  }
  