### Question:
ResendResponse { public void setPayload(byte[] payload) { this.payload = payload; } ResendResponse();  ResendResponse(byte[] payload); Optional<byte[]> getPayload(); void setPayload(byte[] payload);  }### Answer:
@Test public void setPayload() { ResendResponse resendResponse = new ResendResponse(); resendResponse.setPayload("HELLOW".getBytes()); assertThat(resendResponse.getPayload()).isPresent(); }