How to use

getMessageContent

method

in

com.linecorp.bot.client.LineMessagingService

@Override
public CompletableFuture<MessageContentResponse> getMessageContent(final String messageId) {
  return toMessageContentResponseFuture(retrofitImpl.getMessageContent(messageId));
}

@Test
public void getMessageContentTest() throws Exception {
  whenCall(retrofitMock.getMessageContent(any()),
       ResponseBody.create(MediaType.parse("image/jpeg"), ZERO_BYTES));
  // Do
  final MessageContentResponse contentResponse = target.getMessageContent("ID").get();
  // Verify
  verify(retrofitMock, only()).getMessageContent("ID");
  assertThat(contentResponse.getLength()).isEqualTo(0);
  assertThat(contentResponse.getMimeType()).isEqualTo("image/jpeg");
}