@Test
public void linkRichMenuToUsers() {

    whenCall(retrofitMock.linkRichMenuToUsers(any()), null);
    // Do
    final BotApiResponse botApiResponse = target.linkRichMenuIdToUsers(singletonList("USER_ID"),
                                                                       "RICH_MENU_ID")
                                                .join();
    // Verify
    verify(retrofitMock, only()).linkRichMenuToUsers(RichMenuBulkLinkRequest.builder()
                                                                            .richMenuId("RICH_MENU_ID")
                                                                            .userId("USER_ID")
                                                                            .build());
    assertThat(botApiResponse).isEqualTo(BOT_API_SUCCESS_RESPONSE);
}