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.chunking;
  
  import static com.google.common.truth.Truth.assertThat;
  
  import static org.mockito.Mockito.inOrder;
  import static org.mockito.Mockito.mock;
  
  import android.platform.test.annotations.Presubmit;
  
  import com.android.server.backup.encryption.chunk.ChunkHash;
  import com.android.server.backup.encryption.chunk.ChunksMetadataProto;
  
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.mockito.InOrder;
  import org.mockito.Mock;
  import org.robolectric.RobolectricTestRunner;
  
  import java.util.Arrays;
  
  @RunWith(RobolectricTestRunner.class)
  @Presubmit
  public class LengthlessEncryptedChunkEncoderTest {
      private static final byte[] TEST_NONCE =
              Arrays.copyOf(new byte[] {1}, EncryptedChunk.NONCE_LENGTH_BYTES);
      private static final byte[] TEST_KEY_DATA =
              Arrays.copyOf(new byte[] {2}, EncryptedChunk.KEY_LENGTH_BYTES);
      private static final byte[] TEST_DATA = {5, 4, 5, 7, 10, 12, 1, 2, 9};
  
      @Mock private BackupWriter mMockBackupWriter;
      private ChunkHash mTestKey;
      private EncryptedChunk mTestChunk;
      private EncryptedChunkEncoder mEncoder;
  
      @Before
      public void setUp() throws Exception {
          mMockBackupWriter = mock(BackupWriter.class);
          mTestKey = new ChunkHash(TEST_KEY_DATA);
          mTestChunk = EncryptedChunk.create(mTestKey, TEST_NONCE, TEST_DATA);
          mEncoder = new LengthlessEncryptedChunkEncoder();
      }
  
      @Test
      public void writeChunkToWriter_writesNonceThenData() throws Exception {
          mEncoder.writeChunkToWriter(mMockBackupWriter, mTestChunk);
  
          InOrder inOrder = inOrder(mMockBackupWriter);
          inOrder.verify(mMockBackupWriter).writeBytes(TEST_NONCE);
          inOrder.verify(mMockBackupWriter).writeBytes(TEST_DATA);
      }
  
      @Test
      public void getEncodedLengthOfChunk_returnsSumOfNonceAndDataLengths() {
          int encodedLength = mEncoder.getEncodedLengthOfChunk(mTestChunk);
  
          assertThat(encodedLength).isEqualTo(TEST_NONCE.length + TEST_DATA.length);
      }
  
      @Test
      public void getChunkOrderingType_returnsExplicitStartsType() {
          assertThat(mEncoder.getChunkOrderingType()).isEqualTo(ChunksMetadataProto.EXPLICIT_STARTS);
      }
  }
  