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.android.server.backup.encryption.chunk;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import android.platform.test.annotations.Presubmit;
  
  import com.google.common.primitives.Bytes;
  
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.robolectric.RobolectricTestRunner;
  
  import java.util.Arrays;
  
  @RunWith(RobolectricTestRunner.class)
  @Presubmit
  public class ChunkHashTest {
      private static final int HASH_LENGTH_BYTES = 256 / 8;
      private static final byte[] TEST_HASH_1 = Arrays.copyOf(new byte[] {1}, HASH_LENGTH_BYTES);
      private static final byte[] TEST_HASH_2 = Arrays.copyOf(new byte[] {2}, HASH_LENGTH_BYTES);
  
      @Test
      public void testGetHash_returnsHash() {
          ChunkHash chunkHash = new ChunkHash(TEST_HASH_1);
  
          byte[] hash = chunkHash.getHash();
  
          assertThat(hash).asList().containsExactlyElementsIn(Bytes.asList(TEST_HASH_1)).inOrder();
      }
  
      @Test
      public void testEquals() {
          ChunkHash chunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash equalChunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash chunkHash2 = new ChunkHash(TEST_HASH_2);
  
          assertThat(chunkHash1).isEqualTo(equalChunkHash1);
          assertThat(chunkHash1).isNotEqualTo(chunkHash2);
      }
  
      @Test
      public void testHashCode() {
          ChunkHash chunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash equalChunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash chunkHash2 = new ChunkHash(TEST_HASH_2);
  
          int hash1 = chunkHash1.hashCode();
          int equalHash1 = equalChunkHash1.hashCode();
          int hash2 = chunkHash2.hashCode();
  
          assertThat(hash1).isEqualTo(equalHash1);
          assertThat(hash1).isNotEqualTo(hash2);
      }
  
      @Test
      public void testCompareTo_whenEqual_returnsZero() {
          ChunkHash chunkHash = new ChunkHash(TEST_HASH_1);
          ChunkHash equalChunkHash = new ChunkHash(TEST_HASH_1);
  
          int result = chunkHash.compareTo(equalChunkHash);
  
          assertThat(result).isEqualTo(0);
      }
  
      @Test
      public void testCompareTo_whenArgumentGreater_returnsNegative() {
          ChunkHash chunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash chunkHash2 = new ChunkHash(TEST_HASH_2);
  
          int result = chunkHash1.compareTo(chunkHash2);
  
          assertThat(result).isLessThan(0);
      }
  
      @Test
      public void testCompareTo_whenArgumentSmaller_returnsPositive() {
          ChunkHash chunkHash1 = new ChunkHash(TEST_HASH_1);
          ChunkHash chunkHash2 = new ChunkHash(TEST_HASH_2);
  
          int result = chunkHash2.compareTo(chunkHash1);
  
          assertThat(result).isGreaterThan(0);
      }
  }
  