@Test
public void acceptCompletableListReplyTest() throws Exception {

    // Do
    final CompletableFuture<List<TextMessage>> returnValue = new CompletableFuture<>();
    target.accept(returnValue);
    returnValue.complete(singletonList(new TextMessage("Reply Text")));
    // Verify
    verify(lineMessagingClient, only())
            .replyMessage(new ReplyMessage(EVENT.getReplyToken(),
                                           singletonList(new TextMessage("Reply Text"))));
}