int totalBytes = copy.encode(buffer, 0);

            // Then
            assertEquals(HEADER_SIZE + 20 + 24 + 22, totalBytes);
            verify(mockChunk1).encode(buffer, HEADER_SIZE);
            verify(mockChunk2).encode(buffer, HEADER_SIZE + 20);
            verify(mockChunk3).encode(buffer, HEADER_SIZE + 20 + 24);
        }
    }