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  package org.apache.cayenne.crypto.transformer.bytes;
  
  import org.apache.cayenne.crypto.unit.SwapBytesTransformer;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.ArgumentMatchers.anyInt;
  import static org.mockito.Mockito.mock;
  import static org.mockito.Mockito.when;
  
  /**
   * @since 4.0
   */
  public class HmacEncryptorTest {
  
      @Test
      public void encrypt() throws Exception {
          HmacEncryptor encryptor = mock(HmacEncryptor.class);
          encryptor.delegate = SwapBytesTransformer.encryptor();
          when(encryptor.createHmac(any(byte[].class))).thenReturn(new byte[]{0, 1, 2, 3, 4, 5, 6, 7});
          when(encryptor.encrypt(any(byte[].class), anyInt(), any(byte[].class))).thenCallRealMethod();
  
          byte[] input = {-1, -2, -3};
  
          byte[] result1 = encryptor.encrypt(input, 0, new byte[1]);
          assertArrayEquals(new byte[]{8, 0, 1, 2, 3, 4, 5, 6, 7, -3, -2, -1}, result1);
  
          byte[] result2 = encryptor.encrypt(input, 5, new byte[1]);
          assertArrayEquals(new byte[]{0, 0, 0, 0, 0, 8, 0, 1, 2, 3, 4, 5, 6, 7, -3, -2, -1}, result2);
  
      }
  
  }