@Test
public void getRichMenuIdOfUserTest() throws Exception {

    whenCall(retrofitMock.getRichMenuIdOfUser(any()),
             RICH_MENU_ID_RESPONSE);
    // Do
    final RichMenuIdResponse richMenuIdResponse = target.getRichMenuIdOfUser("ID").get();
    // Verify
    verify(retrofitMock, only()).getRichMenuIdOfUser("ID");
    assertThat(richMenuIdResponse).isEqualTo(RICH_MENU_ID_RESPONSE);
}