public async Task GetLastDiary_ReturnLast()
{
var lastDate = new DateTime(2020, 2, 1);
await _diaryService.WriteDiaryAsync(_user, _diary, lastDate, "content-2");
await _diaryService.WriteDiaryAsync(_user, _diary, lastDate.AddDays(-1), "content-1");
var view = await _diaryService.GetLastDiaryViewAsync(_user, _diary);
Assert.NotNull(view);
Assert.Equal(lastDate, view.DiaryContents.First().Date);
Assert.Equal(lastDate, view.DiaryNavigationData.Today);
}