src.setAaa("111");
        src.setCcc("333");

        final MyClass2 dest = new MyClass2();
        dest.setAaa("aaa");
        dest.setBbb("bbb");
        dest.setDdd("ddd");

        BeanUtil.copyBeanToBean(src, dest);
        assertThat(dest.getAaa(), is("111"));
        assertThat(dest.getBbb(), is(nullValue()));
        assertThat(dest.getDdd(), is("ddd"));
    }

    /**
     * @throws Exception
     */

        assertSame(authEx, thrown, "Should rethrow the same SmbAuthException instance");
        verify(dest, times(1)).getAttributes();
        verify(dest, never()).setPathInformation(anyInt(), anyLong(), anyLong(), anyLong());
    }

    @Test
    @DisplayName("openCopyTargetFile throws NPE on null dest (invalid input)")
    void openCopyTargetFile_nullDest_throwsNPE() {
        // Arrange

  }

  public void testIntWriteBytesTo() {
    byte[] dest = new byte[4];
    HashCode.fromInt(42).writeBytesTo(dest, 0, 4);
    assertThat(dest).isEqualTo(HashCode.fromInt(42).asBytes());
  }

  public void testLongWriteBytesTo() {
    byte[] dest = new byte[8];
    HashCode.fromLong(42).writeBytesTo(dest, 0, 8);
    assertThat(dest).isEqualTo(HashCode.fromLong(42).asBytes());
  }

      dest[3] = '%';
      dest[6] = '%';
      dest[8] = upperHexDigits[cp & 0xF];
      cp >>>= 4;
      dest[7] = upperHexDigits[0x8 | (cp & 0x3)];
      cp >>>= 2;
      dest[5] = upperHexDigits[cp & 0xF];
      cp >>>= 4;
      dest[4] = upperHexDigits[0x8 | (cp & 0x3)];
      cp >>>= 2;
      dest[2] = upperHexDigits[cp];
      return dest;
    } else if (cp <= 0x10ffff) {
      char[] dest = new char[12];

    }

    @Test
    void testWriteSecurityBuffer() {
        // Test writeSecurityBuffer
        byte[] dest = new byte[8]; // Enough for length, max_length, offset
        byte[] src = "Test".getBytes();

        // Test with non-null source array
        int nextOffset = NtlmMessage.writeSecurityBuffer(dest, 0, src);

    }

    @Test
    void testEncodeWithOffset() {
        // Test encoding with a destination offset
        byte[] data = { 0x01, 0x02, 0x03, 0x04, 0x05 };
        ByteEncodable encodable = new ByteEncodable(data, 0, 3);
        byte[] dest = new byte[5]; // {0,0,0,0,0}
        dest[0] = (byte) 0xFF; // Add some initial data to dest

        assertArrayEquals(before, dest, "Zero length should leave dest unchanged");
    }

    @Test
    @DisplayName("writeSecurityBuffer copies data and sets fields")
    void testWriteSecurityBufferNonZero() {
        byte[] dest = new byte[8 + 4];
        byte[] payload = { 0x55, 0x66, 0x77 };
        NtlmMessage.writeSecurityBuffer(dest, 0, 8, payload);

    static void writeULong(final byte[] dest, final int offset, final int ulong) {
        dest[offset] = (byte) (ulong & 0xff);
        dest[offset + 1] = (byte) (ulong >> 8 & 0xff);
        dest[offset + 2] = (byte) (ulong >> 16 & 0xff);
        dest[offset + 3] = (byte) (ulong >> 24 & 0xff);
    }

    static void writeUShort(final byte[] dest, final int offset, final int ushort) {
        dest[offset] = (byte) (ushort & 0xff);

  }

  public void testIntWriteBytesTo() {
    byte[] dest = new byte[4];
    HashCode.fromInt(42).writeBytesTo(dest, 0, 4);
    assertThat(dest).isEqualTo(HashCode.fromInt(42).asBytes());
  }

  public void testLongWriteBytesTo() {
    byte[] dest = new byte[8];
    HashCode.fromLong(42).writeBytesTo(dest, 0, 8);
    assertThat(dest).isEqualTo(HashCode.fromLong(42).asBytes());
  }

     * @param dest The destination Bean. Must not be {@literal null}.
     */
    public static void copyBeanToBean(final Object src, final Object dest) {
        copyBeanToBean(src, dest, DEFAULT_OPTIONS);
    }

    /**
     * Copies properties from one Bean to another Bean.
     *
     * @param src The source Bean. Must not be {@literal null}.