content: /*
   * Copyright (C) 2018 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.util;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import androidx.test.ext.junit.runners.AndroidJUnit4;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  
  /** Unit test for {@link TimedValueQueue}. */
  @RunWith(AndroidJUnit4.class)
  public class TimedValueQueueTest {
  
    private TimedValueQueue<String> queue;
  
    @Before
    public void setUp() throws Exception {
      queue = new TimedValueQueue<>();
    }
  
    @Test
    public void bufferCapacityIncreasesAutomatically() {
      queue = new TimedValueQueue<>(1);
      for (int i = 0; i < 20; i++) {
        queue.add(i, "" + i);
        if ((i & 1) == 1) {
          assertThat(queue.pollFirst()).isEqualTo("" + (i / 2));
        }
      }
      assertThat(queue.size()).isEqualTo(10);
    }
  
    @Test
    public void timeDiscontinuityClearsValues() {
      queue.add(1, "b");
      queue.add(2, "c");
      queue.add(0, "a");
      assertThat(queue.size()).isEqualTo(1);
      assertThat(queue.pollFirst()).isEqualTo("a");
    }
  
    @Test
    public void timeDiscontinuityOnFullBufferClearsValues() {
      queue = new TimedValueQueue<>(2);
      queue.add(1, "b");
      queue.add(3, "c");
      queue.add(2, "a");
      assertThat(queue.size()).isEqualTo(1);
      assertThat(queue.pollFirst()).isEqualTo("a");
    }
  
    @Test
    public void pollFirstReturnsValues() {
      queue.add(0, "a");
      queue.add(1, "b");
      queue.add(2, "c");
      assertThat(queue.pollFirst()).isEqualTo("a");
      assertThat(queue.size()).isEqualTo(2);
      assertThat(queue.pollFirst()).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(1);
      assertThat(queue.pollFirst()).isEqualTo("c");
      assertThat(queue.size()).isEqualTo(0);
      assertThat(queue.pollFirst()).isEqualTo(null);
      assertThat(queue.size()).isEqualTo(0);
    }
  
    @Test
    public void pollReturnsValues() {
      queue.add(0, "a");
      queue.add(1, "b");
      queue.add(2, "c");
      assertThat(queue.poll(0)).isEqualTo("a");
      assertThat(queue.size()).isEqualTo(2);
      assertThat(queue.poll(1)).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(1);
      assertThat(queue.poll(2)).isEqualTo("c");
      assertThat(queue.size()).isEqualTo(0);
      assertThat(queue.pollFirst()).isEqualTo(null);
      assertThat(queue.size()).isEqualTo(0);
    }
  
    @Test
    public void pollReturnsClosestValue() {
      queue.add(0, "a");
      queue.add(3, "b");
      assertThat(queue.poll(2)).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(0);
    }
  
    @Test
    public void pollRemovesPreviousValues() {
      queue.add(0, "a");
      queue.add(1, "b");
      queue.add(2, "c");
      assertThat(queue.poll(1)).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(1);
    }
  
    @Test
    public void pollFloorReturnsClosestPreviousValue() {
      queue.add(0, "a");
      queue.add(3, "b");
      assertThat(queue.pollFloor(2)).isEqualTo("a");
      assertThat(queue.pollFloor(2)).isEqualTo(null);
      assertThat(queue.pollFloor(3)).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(0);
    }
  
    @Test
    public void pollFloorRemovesPreviousValues() {
      queue.add(0, "a");
      queue.add(1, "b");
      queue.add(2, "c");
      assertThat(queue.pollFloor(1)).isEqualTo("b");
      assertThat(queue.size()).isEqualTo(1);
    }
  }
  