How to use

getRichMenuImage

method

in

com.linecorp.bot.client.LineMessagingService

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

@Test
public void getRichMenuImageTest() throws Exception {
  whenCall(retrofitMock.getRichMenuImage(any()),
       ResponseBody.create(MediaType.parse("image/jpeg"), ZERO_BYTES));
  // Do
  final MessageContentResponse messageContentResponse = target.getRichMenuImage("ID").get();
  // Verify
  verify(retrofitMock, only()).getRichMenuImage("ID");
  assertThat(messageContentResponse.getLength()).isZero();
}